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dosbox-x.reference.full.conf
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dosbox-x.reference.full.conf
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# This is the configuration file for DOSBox-X 2024.07.01. (Please use the latest version of DOSBox-X)
# Lines starting with a # are comment lines and are ignored by DOSBox-X.
# They are used to (briefly) document the effect of each option.
# To write out ALL options, use command 'config -all' with -wc or -writeconf options.
[sdl]
# fullscreen: Start DOSBox-X directly in fullscreen. (Press [F11/F12]+F to go back)
# fulldouble: Use double buffering in fullscreen. It can reduce screen flickering, but it can also result in a slow DOSBox-X.
# fullresolution: What resolution to use for fullscreen: original, desktop or a fixed size (e.g. 1024x768).
# Using your monitor's native resolution with aspect=true might give the best results.
# If you end up with small window on a large screen, try an output different from surface.
# windowresolution: Scale the window to this size IF the output device supports hardware scaling.
# (output=surface does not!)
# windowposition: Set the window position at startup in the positionX,positionY format (e.g.: 1300,200).
# The window will be centered with "," (or empty), and will be in the original position with "-".
# display: Specify a screen/display number to use for a multi-screen setup (0 = default).
# output: What video system to use for output (openglnb = OpenGL nearest; openglpp = OpenGL perfect; ttf = TrueType font output).
# Possible values: default, surface, overlay, ttf, opengl, openglnb, openglhq, openglpp, ddraw, direct3d.
# videodriver: Forces a video driver (e.g. windib/windows, directx, x11, fbcon, dummy, etc) for the SDL library to use.
# transparency: Set the transparency of the DOSBox-X screen (both windowed and full-screen modes, on SDL2 and Windows SDL1 builds).
# The valid value is from 0 (no transparency, the default setting) to 90 (high transparency).
# maximize: If set, the DOSBox-X window will be maximized at start (SDL2 and Windows SDL1 builds only; use fullscreen for TTF output).
# autolock: Mouse will automatically lock, if you click on the screen. (Press CTRL-F10 to unlock)
# autolock_feedback: Autolock status feedback type, i.e. visual, auditive, none.
# Possible values: none, beep, flash.
# middle_unlock: Whether you can press the middle mouse button to unlock the mouse when the mouse has been locked.
# If set to "manual", it works only with "autolock=false"; if set to "auto", it works only with "autolock=true".
# Possible values: none, manual, auto, both.
# clip_mouse_button: Select the mouse button or use arrow keys for the shared clipboard copy/paste function.
# The default mouse button is "right", which means using the right mouse button to select text, copy to and paste from the host clipboard.
# Set to "middle" to use the middle mouse button, "arrows" to use arrow keys instead of a mouse button, or "none" to disable this feature.
# For "arrows", press Home key (or Fn+Shift+Left on Mac laptops) to start selection, and End key (or Fn+Shift+Right on Mac laptops) to end selection.
# Possible values: none, middle, right, arrows.
# clip_key_modifier: Change the keyboard modifier for the shared clipboard copy/paste function using a mouse button or arrow keys.
# The default modifier is "shift" (both left and right shift keys). Set to "none" if no modifier is desired.
# Possible values: none, ctrl, lctrl, rctrl, alt, lalt, ralt, shift, lshift, rshift, ctrlalt, ctrlshift, altshift, lctrlalt, lctrlshift, laltshift, rctrlalt, rctrlshift, raltshift.
# clip_paste_bios: Specify whether to use BIOS keyboard functions for the clipboard pasting instead of the keystroke method.
# For pasting clipboard text into Windows 3.x/9x applications (e.g. Notepad), make sure to use the keystroke method.
# Possible values: true, false, 1, 0, default.
# clip_paste_speed: Set keyboard speed for pasting text from the shared clipboard.
# If the default setting of 30 causes lost keystrokes, increase the number.
# Or experiment with decreasing the number for applications that accept keystrokes quickly.
# sensitivity: Mouse sensitivity. The optional second parameter specifies vertical sensitivity (e.g. 100,-50).
# usesystemcursor: Use the mouse cursor of the host system instead of drawing a DOS mouse cursor. Activated when the mouse is not locked.
# mouse_emulation: When is mouse emulated ?
# integration: when not locked
# locked: when locked
# always: every time
# never: at no time
# If disabled, the mouse position in DOSBox-X is exactly where the host OS reports it.
# When using a high DPI mouse, the emulation of mouse movement can noticeably reduce the
# sensitiveness of your device, i.e. the mouse is slower but more precise.
# Possible values: integration, locked, always, never.
# mouse_wheel_key: Convert mouse wheel movements into keyboard presses such as arrow keys.
# 0: disabled; 1: up/down arrows; 2: left/right arrows; 3: PgUp/PgDn keys.
# 4: Ctrl+up/down arrows; 5: Ctrl+left/right arrows; 6: Ctrl+PgUp/PgDn keys.
# 7: Ctrl+W/Z, as supported by text editors like WordStar and MS-DOS EDIT.
# Putting a minus sign in front will disable the conversion for guest systems.
# waitonerror: Wait before closing the console if DOSBox-X has an error.
# priority: Priority levels for DOSBox-X. Second entry behind the comma is for when DOSBox-X is not focused/minimized.
# pause is only valid for the second entry.
# Possible values: lowest, lower, normal, higher, highest, pause.
# mapperfile: File used to load/save the key/event mappings from. Resetmapper only works with the default value.
# mapperfile_sdl1: File used to load/save the key/event mappings from DOSBox-X SDL1 builds. If set it will override "mapperfile" for SDL1 builds.
# mapperfile_sdl2: File used to load/save the key/event mappings from DOSBox-X SDL2 builds. If set it will override "mapperfile" for SDL2 builds.
# forcesquarecorner: If set, DOSBox-X will force square corners (instead of round corners) for the DOSBox-X window when running in Windows 11.
# usescancodes: Avoid usage of symkeys, in favor of scancodes. Might not work on all operating systems.
# If set to "auto" (default), it is enabled when using non-US keyboards in SDL1 builds.
# Possible values: true, false, 1, 0, auto.
# overscan: Width of the overscan border (0 to 10) for the "surface" output.
# titlebar: Change the string displayed in the DOSBox-X title bar.
# showbasic: If set, DOSBox-X will show basic information including the DOSBox-X version number and current running speed in the title bar.
# showdetails: If set, DOSBox-X will show the cycles count (FPS) and emulation speed relative to realtime in the title bar.
# showmenu: Whether to show the menu bar (if supported). Default true.
fullscreen = false
fulldouble = false
fullresolution = desktop
windowresolution = original
windowposition = -
display = 0
output = default
videodriver =
transparency = 0
maximize = false
autolock = false
autolock_feedback = beep
middle_unlock = manual
clip_mouse_button = right
clip_key_modifier = shift
clip_paste_bios = default
clip_paste_speed = 30
sensitivity = 100
usesystemcursor = false
mouse_emulation = locked
mouse_wheel_key = -1
waitonerror = true
priority = higher,normal
mapperfile = mapper-dosbox-x.map
mapperfile_sdl1 =
mapperfile_sdl2 =
forcesquarecorner = true
usescancodes = auto
overscan = 0
titlebar =
showbasic = true
showdetails = false
showmenu = true
[log]
# logfile: file where the log messages will be saved to
# vga: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# vgagfx: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# vgamisc: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# int10: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# sblaster: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# dma_control: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# fpu: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# cpu: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# paging: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# fcb: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# files: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# ioctl: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# exec: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# dosmisc: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# pit: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# keyboard: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# pic: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# mouse: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# bios: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# gui: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# misc: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# io: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# pci: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# sst: Enable/Disable logging of this type.
# Possible values: true, false, debug, normal, warn, error, fatal, never.
# int21: Log all INT 21h calls
# fileio: Log file I/O through INT 21h
# debuggerrun: The run mode when the DOSBox-X Debugger starts.
# Possible values: debugger, normal, watch.
logfile =
vga = false
vgagfx = false
vgamisc = false
int10 = false
sblaster = false
dma_control = false
fpu = false
cpu = false
paging = false
fcb = false
files = false
ioctl = false
exec = false
dosmisc = false
pit = false
keyboard = false
pic = false
mouse = false
bios = false
gui = false
misc = false
io = false
pci = false
sst = false
int21 = false
fileio = false
debuggerrun = debugger
[dosbox]
# language: Select a language file for DOSBox-X to use. Encoded with either UTF-8 or a DOS code page.
# You can set code page either in the language file or with "country" setting in [config] section.
# title: Additional text to place in the title bar of the window.
# fastbioslogo: If set, DOSBox-X will skip the BIOS screen by activating fast BIOS logo mode (without 1-second pause).
# disable graphical splash: If set, DOSBox-X will always display text-mode BIOS splash screen instead of the graphical one.
# The text-mode BIOS screen will automatically be used if the TrueType font (TTF) output is enabled.
# startbanner: If set (default), DOSBox-X will display the welcome banner when it starts.
# bannercolortheme: You can specify a different background color theme for the welcome banner from the default one.
# Possible values: default, black, red, green, yellow, blue, magenta, cyan, white.
# dpi aware: Set this option (auto by default) to indicate to your OS that DOSBox-X is DPI aware.
# If it is not set, Windows Vista/7/8/10 and higher may upscale the DOSBox-X window
# on higher resolution monitors which is probably not what you want.
# Possible values: true, false, 1, 0, auto.
# quit warning: Set this option to indicate whether DOSBox-X should show a warning message when the user tries to close its window.
# If set to auto (default), DOSBox-X will warn if a DOS program, game or a guest system is currently running.
# If set to autofile, DOSBox-X will warn if there are open file handles or a guest system is currently running.
# Possible values: true, false, 1, 0, auto, autofile.
# allow quit after warning: If set to false, DOSBox-X will disallow the quit option after displaying a warning message.
# working directory option: Select an option for DOSBox-X's working directory when it runs.
# autoprompt: DOSBox-X will auto-decide whether to prompt for a working directory.
# config: DOSBox-X will use the primary config file directory as the working directory.
# custom: Specify a working directory via the "working directory default" option.
# default: Similar to autoprompt, but DOSBox-X will ask whether to save the selected folder.
# force: Similar to "custom", while overriding -defaultdir command-line option if used.
# noprompt: DOSBox-X uses the current directory and never prompts for a working directory.
# program: DOSBox-X will use the DOSBox-X program directory as the working directory.
# prompt: DOSBox-X will always ask the user to select a working directory when it runs.
# userconfig: DOSBox-X will use its user configuration directory as the working directory.
# Possible values: autoprompt, config, custom, default, force, noprompt, program, prompt, userconfig.
# working directory default: The default directory to act as DOSBox-X's working directory. See also the setting "working directory option".
# For working directory option=prompt, the specified directory becomes the default directory for the folder selection.
# show advanced options: If set, the Configuration Tool will display all config options (including advanced ones) by default.
# resolve config path: If set to true, DOSBox-X will resolve options containing paths in the config file (except [autoexec] section).
# This includes environment variables (%VAR% [DOS/Windows] or ${VAR} [Linux/macOS] and tilde (~) in Linux/macOS.
# If set to dosvar, DOSBox-X forces to resolve DOS-style environment variables (%VAR%) in all platforms (and tilde).
# If set to tilde, DOSBox-X will only resolve tilde (~) in Linux/macOS but will not resolve environment variables.
# Possible values: true, false, dosvar, tilde, 1, 0.
# hostkey: By default, DOSBox-X uses the mapper-defined host key, which defaults to F11 on Windows and F12 on other platforms.
# You may alternatively specify a host key with this setting and bypass the host key as defined in the mapper.
# This can also be done from the menu ("Main" => "Select host key").
# Possible values: ctrlalt, ctrlshift, altshift, mapper.
# mapper send key: Select the key the mapper SendKey function will send.
# Possible values: winlogo, winmenu, alttab, ctrlesc, ctrlbreak, ctrlaltdel.
# ime: Enables support for the system input methods (IME) for inputting characters in Windows and Linux builds.
# If set to auto, this feature is only enabled if DOSBox-X starts with a Chinese/Japanese/Korean code page.
# Possible values: true, false, 1, 0, auto.
# synchronize time: If set, DOSBox-X will try to automatically synchronize time with the host, unless you decide to change the date/time manually.
# keyboard hook: Use keyboard hook (currently only on Windows) to catch special keys and synchronize the keyboard LEDs with the host.
# weitek: If set, emulate the Weitek coprocessor. This option only has effect if cputype=386 or cputype=486.
# bochs debug port e9: If set, emulate Bochs debug port E9h. ASCII text written to this I/O port is assumed to be debug output, and logged.
# machine: The type of machine DOSBox-X tries to emulate.
# Possible values: mda, cga, cga_mono, cga_rgb, cga_composite, cga_composite2, hercules, hercules_plus, hercules_incolor, hercules_color, tandy, pcjr, pcjr_composite, pcjr_composite2, amstrad, ega, ega200, jega, mcga, vgaonly, svga_s3, svga_s386c928, svga_s3vision864, svga_s3vision868, svga_s3vision964, svga_s3vision968, svga_s3trio32, svga_s3trio64, svga_s3trio64v+, svga_s3virge, svga_s3virgevx, svga_et3000, svga_et4000, svga_paradise, vesa_nolfb, vesa_oldvbe, vesa_oldvbe10, pc98, pc9801, pc9821, svga_ati_egavgawonder, svga_ati_vgawonder, svga_ati_vgawonderplus, svga_ati_vgawonderxl, svga_ati_vgawonderxl24, svga_ati_mach8, svga_ati_mach32, svga_ati_mach64, fm_towns.
# captures: Directory where things like wave, midi, screenshot get captured.
# autosave: Enable the auto-save state feature. Specify a time interval in seconds, and optionally a save slot or start and end save slots.
# For example, "autosave=10 11-20" will set a 10-second time interval for auto-saving, and the save slots used will be between 11 and 20.
# You can additionally specify up to 9 programs for this feature, e.g. "autosave=10 11-20 EDIT:21-30 EDITOR:35" for "EDIT" and "EDITOR".
# Putting a minus sign (-) before the time interval causes the auto-saving function to not be activated at start.
# saveslot: Select the default save slot (1-100) to save/load states.
# savefile: Select the default save file to save/load states. If specified it will be used instead of the save slot.
# video debug at startup: If set, have video debug displays on by default
# saveremark: If set, the save state feature will ask users to enter remarks when saving a state.
# forceloadstate: If set, DOSBox-X will load a saved state even if it finds there is a mismatch in the DOSBox-X version, machine type, program name and/or the memory size.
# compresssaveparts: If set, DOSBox-X will compress components of saved states to save space.
# show recorded filename: If set, DOSBox-X will show message boxes with recorded filenames when making audio or video captures.
# skip encoding unchanged frames: Unchanged frames will not be sent to the video codec as a possible performance and bandwidth optimization.
# capture chroma format: Chroma format to use when capturing to H.264. 'auto' picks the best quality option.
# 4:4:4 Chroma is at full resolution. This provides the best quality, however not widely supported by editing software.
# 4:2:2 Chroma is at half horizontal resolution.
# 4:2:0 Chroma is at quarter resolution, which may cause minor color smearing.
# However, this chroma format is most likely to be compatible with video editing software.
# Possible values: auto, 4:4:4, 4:2:2, 4:2:0.
# capture format: Capture format to use when capturing video. The availability of the format depends on how DOSBox-X was compiled.
# default Use compiled-in default (avi-zmbv)
# avi-zmbv Use DOSBox-style AVI + ZMBV codec with PCM audio
# mpegts-h264 Use MPEG transport stream + H.264 + AAC audio. Resolution & refresh rate changes can be contained
# within one file with this choice, however not all software can support mid-stream format changes.
# Possible values: default, avi-zmbv, mpegts-h264.
# shell environment size: Size of the initial DOSBox-X shell environment block, in bytes. Setting to 0 implies a default size of 720 bytes as in DOSBox.
# You can increase this size to store more environment variables in DOS, although this does not affect the environment block
# of sub-processes spawned from the DOS shell. This option has no effect unless the dynamic kernel allocation is enabled.
# private area size: Set DOSBox-X private memory area size. This area contains private memory structures used by the DOS kernel.
# It is discarded when you boot into another OS. Mainline DOSBox uses 32KB. Testing shows that it is possible
# to run DOSBox with as little as 4KB. If DOSBox-X aborts with error "not enough memory for internal tables"
# then you need to increase this value.
# a20: A20 gate emulation mode.
# The on/off/on_fake/off_fake options are intended for testing and debugging DOS development,
# or to emulate obscure hardware, or to work around potential extended memory problems with DOS programs.
# on_fake/off_fake are intended to test whether a program carries out a memory test to ensure the A20
# gate is set as intended (as HIMEM.SYS does). If it goes by the gate bit alone, it WILL crash.
# This parameter is also changeable from the builtin A20GATE command.
# fast Emulate A20 gating by remapping the first 64KB @ 1MB boundary (fast, mainline DOSBox behavior)
# mask Emulate A20 gating by masking memory I/O address (accurate)
# off Lock A20 gate off (Software/OS cannot enable A20)
# on Lock A20 gate on (Software/OS cannot disable A20)
# off_fake Lock A20 gate off but allow bit to toggle (hope your DOS game tests the HMA!)
# on_fake Lock A20 gate on but allow bit to toggle
# turn off a20 gate on boot: If enabled, A20 gate is switched off when booting a guest OS.
# Enabled by default. Recommended for MS-DOS when HIMEM.SYS is not installed in the guest OS.
# If disabled, and MS-DOS does not load HIMEM.SYS, programs and features that rely on the 1MB wraparound will fail.
# cbus bus clock: C-BUS BCLK frequency (PC-98), used to emulate I/O delay.
# WARNING: In future revisions, PCI/motherboard chipset emulation will allow the guest OS/program to alter this value at runtime.
# std10 10MHz (CPU speed multiple of 5MHz or PCI-based)
# std8 8MHz (CPU speed multiple of 4MHz)
# std5 5MHz (older PC-9801)
# <integer or float> Any integer or floating point value will be used as the clock frequency in Hz
# <integer/integer ratio> If a ratio is given (num/den), the ratio will be used as the clock frequency
# isa bus clock: ISA BCLK frequency, used to emulate I/O delay.
# WARNING: In future revisions, PCI/motherboard chipset emulation will allow the guest OS/program to alter this value at runtime.
# std8.3 8.333MHz (typical 386-class or higher)
# std8 8MHz
# std6 6MHz
# std4.77 4.77MHz (precisely 1/3 x 14.31818MHz). Bus frequency of older PC/XT systems.
# oc10 10MHz
# oc12 12MHz
# oc15 15MHz
# oc16 16MHz
# <integer or float> Any integer or floating point value will be used as the clock frequency in Hz
# <integer/integer ratio> If a ratio is given (num/den), the ratio will be used as the clock frequency
# pci bus clock: PCI bus frequency, used to emulate I/O delay.
# WARNING: In future revisions, PCI/motherboard chipset emulation will allow the guest OS/program to alter this value at runtime.
# std33.3 33.333MHz (very common setting on motherboards)
# std30 30MHz (some older mid-1990's Pentium systems)
# std25 25MHz
# <integer or float> Any integer or floating point value will be used as the clock frequency in Hz
# <integer/integer ratio> If a ratio is given (num/den), the ratio will be used as the clock frequency
# call binary on reset: If set, this is the path of a binary blob to load into the ROM BIOS area and execute immediately after CPU reset.
# It will be executed before the BIOS POST routine, only ONCE. The binary blob is expected either to IRET or to
# jump directly to F000:FFF0 to return control to the BIOS.
# This can be used for x86 assembly language experiments and automated testing against the CPU emulation.
# unhandled irq handler: Determines how unhandled IRQs are handled. This may help some errant DOS applications.
# Leave unset for default behavior (simple).
# simple Acknowledge the IRQ, and the master (if slave IRQ)
# mask_isr Acknowledge IRQs in service on master and slave and mask IRQs still in service, to deal with errant handlers (em-dosbox method)
# Possible values: , simple, cooperative_2nd.
# call binary on boot: If set, this is the path of a binary blob to load into the ROM BIOS area and execute immediately before booting the DOS system.
# This can be used for x86 assembly language experiments and automated testing against the CPU emulation.
# ibm rom basic: If set, this is the path of a ROM image containing IBM ROM BASIC. This is loaded just below the ROM BIOS.
# One recommended file is IBMROMBASIC-F6000h-1982-10-27.ROM, a 32KB ROM BIOS image loaded to segment F600 taken from an IBM 5150.
#
# rom bios allocation max: Maximum size (top down from 1MB) allowed for ROM BIOS dynamic allocation in KB
# rom bios minimum size: Once ROM BIOS layout is finalized, trim total region down to a minimum amount in KB
# irq delay ns: IRQ delay in nanoseconds. Set to -1 to use default, 0 to disable.
# This is a more precise version of the irqdelay= setting.
# There are some old DOS games and demos that have race conditions with IRQs that need a nonzero value here to work properly.
# iodelay: I/O delay in nanoseconds for I/O port access. Set to -1 to use default, 0 to disable.
# A value of 1000 (1us) is recommended for ISA bus type delays. If your game
# or demo is not sensitive to I/O port and ISA bus timing, you can turn this option off
# (set to 0) to increase game performance.
# iodelay16: I/O delay for 16-bit transfers. -1 to use default, 0 to disable.
# iodelay32: I/O delay for 32-bit transfers. -1 to use default, 0 to disable.
# acpi: ACPI emulation, and what version of the specification to follow.
# WARNING: This option is very experimental at this time and should not be enabled unless you're willing to accept the consequences.
# Intended for use with ACPI-aware OSes including Linux and Windows 98/ME. This option will also slightly reduce available
# system memory to make room for the ACPI tables, just as real BIOSes do, and reserve an IRQ for ACPI functions.
# Possible values: off, 1.0, 1.0b, 2.0, 2.0a, 2.0b, 2.0c, 3.0, 3.0a, 3.0b, 4.0, 4.0a, 5.0, 5.0a, 6.0.
# acpi rsd ptr location: Where to store the Root System Description Pointer structure. You can have it stored in the ROM BIOS area, or the Extended Bios Data Area.
# Possible values: auto, bios, ebda.
# acpi sci irq: IRQ to assign as ACPI system control interrupt. set to -1 to automatically assign.
# acpi iobase: I/O port base for the ACPI device Power Management registers. Set to 0 for automatic assignment.
# acpi reserved size: Amount of memory at top to reserve for ACPI structures and tables. Set to 0 for automatic assignment.
# memsize: Amount of memory DOSBox-X has in megabytes.
# This value is best left at its default to avoid problems with some games,
# although other games and applications may require a higher value.
# Programs that use 286 protected mode like Windows 3.0 in Standard Mode may crash with more than 15MB.
# memsizekb: Amount of memory DOSBox-X has in kilobytes.
# This value should normally be set to 0.
# If nonzero, it is added to the memsize parameter.
# Finer grained control of total memory may be useful in
# emulating ancient DOS machines with less than 640KB of
# RAM or early 386 systems with odd extended memory sizes.
# For Tandy and PCjr emulation, it is strongly recommended.
# to specify a size that is a multiple of 32 (kb).
#
# dos mem limit: Limit DOS conventional memory to this amount. Does not affect extended memory.
# Setting this option to a value in the range 636-639 can be used to simulate modern BIOSes
# that maintain an EBDA (Extended BIOS Data Area) at the top of conventional memory.
# You may also play with this option for diagnostic purposes or to stress test DOS programs in limited memory setups.
#
# A few DOS games & demos require this option to be set:
# Majic 12 "Show": If UMBs are enabled, set this option to 639 to avoid MCB chain corruption error.
# isa memory hole at 512kb: If set, emulate an ISA memory hole at the 512KB to 640KB area (0x80000-0x9FFFF).
# Possible values: true, false, 1, 0, auto.
# isa memory hole at 15mb: If set, emulate an ISA memory hole at the 15MB to 16MB area (0xF00000-0xFFFFFF).
# If auto, hole is disabled by default for IBM compatible modes and enabled by default for NEC PC-98 compatible modes.
# The reason for this is that the hole is needed for the PC-9821 256-color mode linear framebuffer to work with some DOS games even when memsize >= 16.
# Possible values: true, false, 1, 0, auto.
# reboot delay: Reboot delay. How long to pause at BIOS POST after reboot in milliseconds.
# This option is provided so that it is possible to see what the guest application
# or OS might have written to the screen before resetting the system. A value of
# -1 means to use a reasonable default.
# memalias: Memory aliasing emulation, in number of valid address bits.
# Many 386/486 class motherboards and processors prior to 1995
# suffered from memory aliasing for various technical reasons. If the software you are
# trying to run assumes aliasing, or otherwise plays cheap tricks with paging,
# enabling this option can help. Note that enabling this option can cause slight performance degradation. Set to 0 to disable.
# Recommended values when enabled:
# 24: 16MB aliasing. Common on 386SX systems (CPU had 24 external address bits)
# or 386DX and 486 systems where the CPU communicated directly with the ISA bus (A24-A31 tied off)
# 26: 64MB aliasing. Some 486s had only 26 external address bits, some motherboards tied off A26-A31
# nocachedir: If set, MOUNT commands will mount with -nocachedir (disable directory caching) by default.
# freesizecap: If set to "cap" (="true"), the value of MOUNT -freesize will apply only if the actual free size is greater than the specified value.
# If set to "relative", the value of MOUNT -freesize will change relative to the specified value.
# If set to "fixed" (="false"), the value of MOUNT -freesize will be a fixed one to be reported all the time.
# Possible values: true, false, fixed, relative, cap, 2, 1, 0.
# convertdrivefat: If set, DOSBox-X will auto-convert mounted non-FAT drives (such as local drives) to FAT format for use with guest systems.
# convert fat free space: If set, auto-converted FAT images will have the specified free space in MB (except PC-98 FAT12/16 HDI) if less than the actual free space.
# If set to 0, the converted disk will be read-only; if set to -1, the actual free space on host drive will be used for the converted disk.
# convert fat timeout: If set to a positive integer, the FAT auto-conversion will time out after the specified number of seconds.
# leading colon write protect image: If set, BOOT and IMGMOUNT commands will put an image file name with a leading colon (:) in write-protect mode.
# locking disk image mount: If set, BOOT and IMGMOUNT commands will try to lock the mounted disk image files. As a result, you cannot
# mount the same disk image files in read/write mode at the same time as this can cause possible disk corruptions.
# unmask keyboard on int 16 read: If set, INT 16h will unmask IRQ 1 (keyboard) when asked to read keyboard input.
# It is strongly recommended that you set this option if running Windows 3.11 Windows for Workgroups in DOSBox-X.
# int16 keyboard polling undocumented cf behavior: If set, INT 16h function AH=01h will also set/clear the carry flag depending on whether input was available.
# There are some old DOS games and demos that rely on this behavior to sense keyboard input, and this behavior
# has been verified to occur on some old (early 90s) BIOSes.
# allow port 92 reset: If set (default), allow the application to reset the CPU through port 92h
# enable port 92: Emulate port 92h (PS/2 system control port A). If you want to emulate a system that pre-dates the PS/2, set to 0.
# enable 1st dma controller: Emulate 1st (AT) DMA controller (default). Set to 0 if you wish to emulate a system that lacks DMA (PCjr and some Tandy systems)
# enable 2nd dma controller: Emulate 2nd (AT) DMA controller (default). Set to 0 if you wish to emulate a PC/XT system without 16-bit DMA.
# Note: mainline DOSBox automatically disables 16-bit DMA when machine=cga or machine=hercules, while DOSBox-X does not.
# allow dma address decrement: If set, allow increment & decrement modes as specified in the 8237 datasheet.
# If clear, always increment the address (as if to emulate clone 8237 implementations that skipped the inc/dec bit).
# enable 128k capable 16-bit dma: If true, DMA controller emulation models ISA hardware that permits 16-bit DMA to span 128KB.
# If false, DMA controller emulation models PCI hardware that limits 16-bit DMA to 64KB boundaries.
# If auto, the choice is made according to other factors in hardware emulation
# Possible values: true, false, 1, 0, auto.
# enable dma extra page registers: If set, emulate the extra page registers (I/O ports 0x80, 0x84-0x86, 0x88, 0x8C-0x8E), like actual hardware.
# Note that mainline DOSBox behavior is to NOT emulate these registers.
# dma page registers write-only: Normally (on AT hardware) the DMA page registers are read/write. Set this option if you want to emulate PC/XT hardware where the page registers are write-only.
# cascade interrupt never in service: If set, PIC emulation will never mark cascade interrupt as in service. This is OFF by default. It is a hack for troublesome games.
# cascade interrupt ignore in service: If true, PIC emulation will allow slave pic interrupts even if the cascade interrupt is still "in service" (common PC-98 behavior)
# If false, PIC emulation will consider cascade in-service state when deciding which interrupt to signal (common IBM PC behavior)
# If auto, setting is chosen based on machine type and other configuration.
# Possible values: true, false, 1, 0, auto.
# enable slave pic: Enable slave PIC (IRQ 8-15). Set this to 0 if you want to emulate a PC/XT type arrangement with IRQ 0-7 and no IRQ 2 cascade.
# enable pc nmi mask: Enable PC/XT style NMI mask register (0xA0). Note that this option conflicts with the secondary PIC and will be ignored if the slave PIC is enabled.
# allow more than 640kb base memory: If set, and space is available, allow conventional memory to extend past 640KB.
# For example, if machine=cga, conventional memory can extend out to 0xB800 and provide up to 736KB of RAM.
# This allows you to emulate PC/XT style memory extensions.
# For machine=tandy, this enables up to 768KB of memory which is then provided as 640KB to DOS to emulate the Tandy 768KB configuration with no overlap between DOS and video memory
# enable pci bus: Enable PCI bus emulation
language =
title =
fastbioslogo = false
disable graphical splash = false
startbanner = true
bannercolortheme = default
dpi aware = auto
quit warning = auto
allow quit after warning = true
working directory option = default
working directory default =
show advanced options = false
resolve config path = true
hostkey = mapper
mapper send key = ctrlaltdel
ime = auto
synchronize time = false
keyboard hook = false
weitek = false
bochs debug port e9 = false
machine = svga_s3
captures = capture
autosave =
saveslot = 1
savefile =
video debug at startup = false
saveremark = true
forceloadstate = false
compresssaveparts = true
show recorded filename = false
skip encoding unchanged frames = false
capture chroma format = auto
capture format = default
shell environment size = 0
private area size = 32768
a20 = mask
turn off a20 gate on boot = true
cbus bus clock = std10
isa bus clock = std8.3
pci bus clock = std33.3
call binary on reset =
unhandled irq handler =
call binary on boot =
ibm rom basic =
rom bios allocation max = 0
rom bios minimum size = 0
irq delay ns = -1
iodelay = -1
iodelay16 = -1
iodelay32 = -1
acpi = off
acpi rsd ptr location = auto
acpi sci irq = -1
acpi iobase = 0
acpi reserved size = 0
memsize = 16
memsizekb = 0
dos mem limit = 0
isa memory hole at 512kb = auto
isa memory hole at 15mb = auto
reboot delay = -1
memalias = 0
nocachedir = false
freesizecap = cap
convertdrivefat = true
convert fat free space = 250
convert fat timeout = 4
leading colon write protect image = true
locking disk image mount = true
unmask keyboard on int 16 read = true
int16 keyboard polling undocumented cf behavior = false
allow port 92 reset = true
enable port 92 = true
enable 1st dma controller = true
enable 2nd dma controller = true
allow dma address decrement = true
enable 128k capable 16-bit dma = auto
enable dma extra page registers = true
dma page registers write-only = false
cascade interrupt never in service = false
cascade interrupt ignore in service = auto
enable slave pic = true
enable pc nmi mask = true
allow more than 640kb base memory = false
enable pci bus = true
[render]
# frameskip: How many frames DOSBox-X skips before drawing one.
# aspect: Aspect ratio correction mode. Can be set to the following values:
# 'false' (default):
# 'direct3d'/opengl outputs: image is simply scaled to full
# window/fullscreen size, possibly resulting in dis-
# proportional image
# 'surface' output: it does no aspect ratio correction,
# resulting in disproportional images if VGA mode pixel
# ratio is not 4:3 (default)
# 'true':
# 'direct3d'/opengl outputs: uses output driver functions to
# scale / pad image with black bars, correcting output
# to proportional 4:3 image
# In most cases image degradation should not be noticeable
# (it all depends on the video adapter and how much the image
# is upscaled).
# Should have none to negligible impact on performance,
# mostly being done in hardware.
# For the pixel-perfect scaling (output=openglpp), it is
# recommended to enable this whenever the emulated display
# has an aspect ratio of 4:3
# 'surface' output: inherits old DOSBox aspect ratio correction
# method (adjusting rendered image line count to correct
# output to 4:3 ratio)
# Due to source image manipulation this mode does not mix
# well with scalers, i.e. multiline scalers like hq2x/hq3x
# will work poorly
# Slightly degrades visual image quality. Has a tiny impact
# on performance.
# When using xBRZ scaler with 'surface' output, aspect
# ratio correction is done by the scaler itself, so none of
# the above apply.
# Possible values: false, true, 0, 1, yes, no, nearest, bilinear.
# aspect_ratio: Set the aspect ratio (e.g. 16:9) in the aspect ratio correction mode. 0:0 means the default ratio of 4:3, and -1:-1 means the original image ratio.
# char9: Allow 9-pixel wide text mode fonts instead of 8-pixel wide fonts.
# euro: Display Euro symbol instead of the specified ASCII character (33-255).
# For example, setting it to 128 allows Euro symbol to be displayed instead of C-cedilla.
# doublescan: If set, doublescanned output emits two scanlines for each source line, in the same manner as the actual VGA output (320x200 is rendered as 640x400 for example).
# If clear, doublescanned output is rendered at the native source resolution (320x200 as 320x200).
# This affects the raster PRIOR to the software or hardware scalers.
# Setting this option may prevent some scalers to work as expected.
# Try turning this option off in such case.
# For pixel-perfect scaling (output=openglpp), it is recommended to turn this option off.
# scaler: Scaler used to enlarge/enhance low resolution modes. Add keyword 'forced', after the name of the scaler to always use the scaler even if the result might not be desired.(e.g. 'normal2x forced')
# Appending 'prompt' will cause a confirmation message for forcing the scaler.
# To fit a scaler in the resolution used at full screen may require a border or side bars.
# To fill the screen entirely, depending on your hardware, a different scaler/fullresolution might work.
# Scalers should work with most output options, but they are ignored for openglpp and TrueType font outputs.
# Possible values: none, normal2x, normal3x, normal4x, normal5x, advmame2x, advmame3x, advinterp2x, advinterp3x, hq2x, hq3x, 2xsai, super2xsai, supereagle, tv2x, tv3x, rgb2x, rgb3x, scan2x, scan3x, gray, gray2x, hardware_none, hardware2x, hardware3x, hardware4x, hardware5x, xbrz, xbrz_bilinear.
# glshader: Path to GLSL shader source to use with OpenGL output ("none" to disable, or "default" for default shader).
# Can be either an absolute path, a file in the "glshaders" subdirectory of the DOSBox-X configuration directory, or one of the built-in shaders (e.g. "sharp" for the pixel-perfect scaling mode):
# advinterp2x, advinterp3x, advmame2x, advmame3x, rgb2x, rgb3x, scan2x, scan3x, tv2x, tv3x, sharp.
# pixelshader: Set Direct3D pixel shader program (effect file must be in Shaders subdirectory). If 'forced' is appended, then the pixel shader will be used even if the result might not be desired.
# xbrz slice: Number of screen lines to process in single xBRZ scaler taskset task, affects xBRZ performance, 16 is the default
# xbrz fixed scale factor: To use fixed xBRZ scale factor (i.e. to attune performance), set it to 2-6, 0 - use automatic calculation (default)
# xbrz max scale factor: To cap maximum xBRZ scale factor used (i.e. to attune performance), set it to 2-6, 0 - use scaler allowed maximum (default)
# autofit: Best fits image to window
# Intended for output=direct3d, fullresolution=original, aspect=true
# monochrome_pal: Specify the color of monochrome display.
# Append 'bright' for a brighter look.
# Possible values: green, amber, gray, white.
frameskip = 0
aspect = false
aspect_ratio = 0:0
char9 = true
euro = -1
doublescan = true
scaler = normal2x
glshader = none
pixelshader = none
xbrz slice = 16
xbrz fixed scale factor = 0
xbrz max scale factor = 0
autofit = true
monochrome_pal = green
[pc98]
# pc-98 BIOS copyright string: If set, the PC-98 BIOS copyright string is placed at E800:0000. Enable this for software that detects PC-98 vs Epson.
# pc-98 int 1b fdc timer wait: If set, INT 1Bh floppy access will wait for the timer to count down before returning.
# This is needed for Ys II to run without crashing.
# pc-98 pic init to read isr: If set, the programmable interrupt controllers are initialized by default (if PC-98 mode) so that the in-service interrupt status can be read immediately. There seems to be a common convention in PC-98 games to program and/or assume this mode for cooperative interrupt handling. This option is enabled by default for best compatibility with PC-98 games.
# pc-98 fm board: In PC-98 mode, selects the FM music board to emulate.
# Possible values: auto, off, false, board14, board26k, board86, board86c.
# pc-98 fm board irq: If set, helps to determine the IRQ of the FM board. A setting of zero means to auto-determine the IRQ.
# pc-98 fm board io port: If set, helps to determine the base I/O port of the FM board. A setting of zero means to auto-determine the port number.
# pc-98 time stamp: Emulate the time stamp/hardware wait I/O ports at 5Ch and 5Eh. This is recommended.
# pc-98 sound bios: Set Sound BIOS enabled bit in MEMSW 4 for some games that require it.
# TODO: Real emulation of PC-9801-26K/86 Sound BIOS
# pc-98 load sound bios rom file: If set, load SOUND.ROM if available and prsent that to the guest instead of trying to emulate directly.
# This is strongly recommended, and is default enabled.
# SOUND.ROM is a snapshot of the FM board BIOS taken from real PC-98 hardware.
# pc-98 buffer page flip: If set, the game's request to page flip will be delayed to vertical retrace, which can eliminate tearline artifacts.
# Note that this is NOT the behavior of actual hardware. This option is provided for the user's preference.
# pc-98 enable 256-color planar: Allow 256-color planar graphics mode if set, disable if not set.
# This is a form of memory access in 256-color mode that existed for a short
# time before later PC-9821 models removed it. This option must be enabled
# to use DOSBox-X with Windows 3.1 and its built-in 256-color driver.
# pc-98 enable 256-color: Allow 256-color graphics mode if set, disable if not set
# pc-98 enable 16-color: Allow 16-color graphics mode if set, disable if not set
# pc-98 enable grcg: Allow GRCG graphics functions if set, disable if not set
# pc-98 enable egc: Allow EGC graphics functions if set, disable if not set
# pc-98 enable 188 user cg: Allow 188+ user-defined CG cells if set
# pc-98 start gdc at 5mhz: Start GDC at 5MHz if set, 2.5MHz if clear. May be required for some games.
# pc-98 allow scanline effect: If set, PC-98 emulation will allow the DOS application to enable the 'scanline effect'
# in 200-line graphics modes upconverted to 400-line raster display. When enabled, odd
# numbered scanlines are blanked instead of doubled
# pc-98 bus mouse: Enable PC-98 bus mouse emulation. Disabling this option does not disable INT 33h emulation.
# pc-98 nec mouse function: If set, Use NEC mouse function in int 33h.
# pc-98 video mode: Specify the preferred PC-98 video mode.
# Valid values are 15, 24, or 31 for each specific horizontal refresh rate on the platform.
# 24khz is default and best supported at this time.
# 15khz is not implemented at this time.
# 31khz is experimental at this time.
# Possible values: , 24khz, 31khz, 15khz.
# pc-98 timer always cycles: This controls PIT 1 PC speaker behavior related to turning the output on and off.
# Default setting is 'auto' to let the emulator choose for you.
# true: PIT 1 will always cycle whether or not the speaker is on (PC-9801 behavior).
# false: PIT 1 will only cycle when the speaker is on (PC-9821 behavior).
# Some older games will require the PC-9801 behavior to function properly.
# Possible values: true, false, 1, 0, auto.
# pc-98 timer master frequency: 8254 timer clock frequency (NEC PC-98). Depending on the CPU frequency the clock frequency is one of two common values.
# If your setting is neither of the below the closest appropriate value will be chosen.
# This setting affects the master clock rate that DOS applications must divide down from to program the timer
# at the correct rate, which affects timer interrupt, PC speaker, and the COM1 RS-232C serial port baud rate.
# 8MHz is treated as an alias for 4MHz and 10MHz is treated as an alias for 5MHz.
# 0: Use default (auto)
# 4: 1.996MHz (as if 4MHz or multiple thereof CPU clock)
# 5: 2.457MHz (as if 5MHz or multiple thereof CPU clock)
# pc-98 allow 4 display partition graphics: According to NEC graphics controller documentation, graphics mode is supposed to support only
# 2 display partitions. Some games rely on hardware flaws that allowed 4 partitions.
# -1: Default (choose automatically)
# 0: Disable
# 1: Enable
# pc-98 force ibm keyboard layout: Force to use a default keyboard layout like IBM US-English for PC-98 emulation.
# Will only work with apps and games using BIOS for keyboard.
# Possible values: true, false, 1, 0, auto.
# pc-98 force JIS keyboard layout: Force to use a default keyboard layout like JIS (JP106) for PC-98 emulation.
# Will only work with apps and games using BIOS for keyboard.
# pc-98 try font rom: If enabled, DOSBox-X will first try to load FONT.ROM as generated by T98Tools for PC-98 emulation.
# pc-98 anex86 font: Specify an Anex86 compatible font to load as supported by the Anex86 emulator for PC-98 emulation.
# By default DOSBox-X tries to load ANEX86.BMP followed by FREECG98.BMP after trying to load FONT.ROM.
# If you specify a font here then it will be tried first, perhaps before FONT.ROM (see previous option).
# pc-98 fontx sbcs: Specifies a FONTX2 file (8x16) to be used in PC-98 mode.
# This file has priority over ANEX86.BMP and FREECG98.BMP.
# pc-98 fontx dbcs: Specifies a FONTX2 file (16x16) to be used in PC-98 mode.
# This file has priority over ANEX86.BMP and FREECG98.BMP.
# pc-98 fontx internal symbol: If set, Use the internal data for hankaku symbols instead of the data in the FONTX2 file.
# pc-98 show graphics layer on initialize: If PC-98 mode and INT 33h emulation is enabled, the graphics layer will be automatically enabled
# at driver startup AND when INT 33h AX=0 is called. This is NEC MOUSE.COM behavior and default
# enabled. To emulate other drivers like QMOUSE that do not follow this behavior, set to false.
pc-98 BIOS copyright string = false
pc-98 int 1b fdc timer wait = false
pc-98 pic init to read isr = true
pc-98 fm board = auto
pc-98 fm board irq = 0
pc-98 fm board io port = 0
pc-98 time stamp = true
pc-98 sound bios = false
pc-98 load sound bios rom file = true
pc-98 buffer page flip = false
pc-98 enable 256-color planar = true
pc-98 enable 256-color = true
pc-98 enable 16-color = true
pc-98 enable grcg = true
pc-98 enable egc = true
pc-98 enable 188 user cg = true
pc-98 start gdc at 5mhz = false
pc-98 allow scanline effect = true
pc-98 bus mouse = true
pc-98 nec mouse function = false
pc-98 video mode =
pc-98 timer always cycles = auto
pc-98 timer master frequency = 0
pc-98 allow 4 display partition graphics = -1
pc-98 force ibm keyboard layout = auto
pc-98 force JIS keyboard layout = false
pc-98 try font rom = true
pc-98 anex86 font =
pc-98 fontx sbcs =
pc-98 fontx dbcs =
pc-98 fontx internal symbol = false
pc-98 show graphics layer on initialize = true
[dosv]
# dosv: Enable DOS/V emulation and specify which version to emulate. This option is intended for use with games or software
# originating from East Asia (China, Japan, Korea) that use the double byte character set (DBCS) encodings and DOS/V extensions
# to display Japanese (jp), Chinese (chs/cht/cn/tw), or Korean (ko) text. Note that enabling DOS/V replaces 80x25 text mode with
# a EGA/VGA graphics mode that emulates text mode to display the characters and may be incompatible with non-Asian software that
# assumes direct access to the text mode via segment 0xB800. For a general DOS environment with CJK support please disable DOS/V
# emulation and use TrueType font (TTF) output with a CJK code page (932, 936, 949, 950) and TTF font with CJK characters instead.
# Possible values: off, jp, ko, chs, cht, cn, tw.
# getsysfont: If enabled, DOSBox-X will try to get and use the system fonts on Windows and Linux platforms for the DOS/V emulation.
# If this cannot be done, then DOSBox-X will try to use the internal Japanese DOS/V font, or you can specify a different font.
# fontxsbcs: FONTX2 file used to rendering SBCS characters (8x19) in DOS/V or JEGA mode. If not specified, the default one will be used.
# Loading the ASC16 and ASCFONT.15 font files (from the UCDOS and ETen Chinese DOS systems) is also supported for the DOS/V mode.
# fontxsbcs16: FONTX2 file used to rendering SBCS characters (8x16) in DOS/V or JEGA mode. If not specified, the default one will be used.
# Loading the ASC16 and ASCFONT.15 font files (from the UCDOS and ETen Chinese DOS systems) is also supported for the DOS/V mode.
# fontxsbcs24: FONTX2 file used to rendering SBCS characters (12x24) in DOS/V mode (with V-text). If not specified, the default one will be used.
# Loading the ASC24 and ASCFONT.24? font files (the latter from the ETen Chinese DOS system) is also supported for the DOS/V mode.
# fontxdbcs: FONTX2 file used to rendering DBCS characters (16x16) in DOS/V or VGA/JEGA mode. If not specified, the default one will be used.
# Alternatively, you can load a BDF or PCF font file (16x16 or 15x15), such as the free bitmap fonts from WenQuanYi (https://wenq.org/).
# For Simplified Chinese DOS/V, loading the HZK16 font file (https://github.com/aguegu/BitmapFont/tree/master/font) is also supported.
# For Traditional Chinese DOS/V, loading the STDFONT.15 font file from the ETen Chinese DOS system is also supported.
# fontxdbcs14: FONTX2 file used to rendering DBCS characters (14x14) for Configuration Tool or EGA mode. If not specified, the default one will be used.
# Alternatively, you can load a BDF or PCF font file (14x14 or 15x15), such as the free bitmap fonts from WenQuanYi (https://wenq.org/).
# For Simplified Chinese DOS/V, loading the HZK14 font file (https://github.com/aguegu/BitmapFont/tree/master/font) is also supported.
# For Traditional Chinese DOS/V, loading the STDFONT.15 font file from the ETen Chinese DOS system is also supported.
# fontxdbcs24: FONTX2 file used to rendering DBCS characters (24x24) in DOS/V mode (with V-text and 24-pixel fonts enabled).
# For Simplified Chinese DOS/V, loading the HZK24? font file (https://github.com/aguegu/BitmapFont/tree/master/font) is also supported.
# For Traditional Chinese DOS/V, loading the STDFONT.24 font file from the ETen Chinese DOS system is also supported.
# showdbcsnodosv: Enables rendering of Chinese/Japanese/Korean characters for DBCS code pages in standard VGA and EGA machine types in non-DOS/V and non-TTF mode.
# DOS/V fonts will be used in such cases, which can be adjusted by the above config options (such as fontxdbcs, fontxdbcs14, and fontxdbcs24).
# Setting to "auto" enables Chinese/Japanese/Korean character rendering if a language file is loaded (or with "autodbcs" option set) in such cases.
# Possible values: true, false, 1, 0, auto.
# yen: Enables the Japanese yen symbol at 5ch if it is found at 7fh in a custom SBCS font for the Japanese DOS/V or JEGA emulation.
# del: Maps the undefined del symbol (0x7F) to the next character (0x80) for the Japanese DOS/V and other Japanese mode emulations.
# fepcontrol: FEP control API for the DOS/V emulation.
# Possible values: ias, mskanji, both.
# vtext1: V-text screen mode 1 for the DOS/V emulation. Enter command "VTEXT 1" for this mode. Note that XGA/SXGA mode is only supported by the svga_s3trio and svga_et4000 machine types.
# Possible values: xga, xga24, sxga, sxga24, svga.
# vtext2: V-text screen mode 2 for the DOS/V emulation. Enter command "VTEXT 2" for this mode. Note that XGA/SXGA mode is only supported by the svga_s3trio and svga_et4000 machine types.
# Possible values: xga, xga24, sxga, sxga24, svga.
# use20pixelfont: Enables the 20 pixel font to be used instead of the 24 pixel system font for the Japanese DOS/V emulation (with V-text enabled).
# j3100: With the setting dosv=jp and a non-off value of this option, the Toshiba J-3100 machine will be emulated with DCGA support.
# Setting to "on" or "auto" starts J-3100 automatically, and with the setting "manual" you can enter J-3100 mode with DCGA command.
# Possible values: off, on, auto, manual, 0, 1, 2.
# j3100type: Specifies the Toshiba J-3100 machine type if J-3100 mode is enabled. The color palette will be changed with different machine types.
# Possible values: default, gt, sgt, gx, gl, sl, sgx, ss, gs, sx, sxb, sxw, sxp, ez, zs, zx.
# j3100colorscroll: Specifies that the color display can be used for scrolling, which is currently incompatible with for example the J-3100 version of the SimCity game.
# The VGA version of the Toshiba Windows 3.1 works fine with the "false" value of this setting, whereas its CGA/EGA version requires a "true" value for this.
# j3100backcolor: Specifies the background color in J-3100 mode. If not specified, the colors will be those of the display type corresponding to the model specified in j3100type.
# j3100textcolor: Specifies the text color in J-3100 mode. If not specified, the colors will be those of the display type corresponding to the model specified in j3100type.
dosv = off
getsysfont = true
fontxsbcs =
fontxsbcs16 =
fontxsbcs24 =
fontxdbcs =
fontxdbcs14 =
fontxdbcs24 =
showdbcsnodosv = auto
yen = false
del = true
fepcontrol = both
vtext1 = svga
vtext2 = xga
use20pixelfont = false
j3100 = off
j3100type = default
j3100colorscroll = false
j3100backcolor =
j3100textcolor =
[video]
# int 10h use video parameter table: If set, INT 10h will use the video parameter table for standard EGA/VGA modes.
# If not set, internal modesetting will be used, same as DOSBox and most forks do.
# If auto, the video parameter table will be used if any DOS program redirects the table (usually to override mode setting parameters)
# Possible values: auto, true, false, 1, 0.
# vmemdelay: VGA Memory I/O delay in nanoseconds. Set to -1 to use default, 0 to disable.
# Default off. Enable this option (-1 or nonzero) if you are running a game or
# demo that needs slower VGA memory (like that of older ISA hardware) to work properly.
# If your game is not sensitive to VGA RAM I/O speed, then turning on this option
# will do nothing but cause a significant drop in frame rate which is probably not
# what you want. Recommended values -1, 0 to 2000.
# prevent capture: This option allows you to prevent capture of the DOSBox window, if an API is provided by the system to do so.
# empty or none: the window is normal and it can be screen captured.
# blank: notify the system so that if a screenshot is attempted, the window appears blank.
# invisible: notify the system not to include the DOSBox window in screen capture.
#
# This option may be useful if you would like to prevent your DOS gaming from appearing in the Windows 11 Recall feature
# Possible values: , none, blank, invisible.
# vmemsize: Amount of video memory in megabytes.
# The maximum resolution and color depth the svga_s3 will be able to display
# is determined by this value.
# -1: auto (vmemsizekb is ignored)
# 0: 512k (800x600 at 256 colors) if vmemsizekb=0
# 1: 1024x768 at 256 colors or 800x600 at 64k colors
# 2: 1600x1200 at 256 colors or 1024x768 at 64k colors or 640x480 at 16M colors
# 4: 1600x1200 at 64k colors or 1024x768 at 16M colors
# 8: up to 1600x1200 at 16M colors
# For build engine games, use more memory than in the list above so it can
# use triple buffering and thus won't flicker.
#
# vmemsizekb: Amount of video memory in kilobytes, in addition to vmemsize.
# vbe window granularity: Controls VESA BIOS non-linear framebuffer window granularity in KB. This affects ONLY the VESA BIOS extensions. Set 0 to functional normally.
# vbe window size: Controls VESA BIOS non-linear framebuffer window size in KB. This affects ONLY the VESA BIOS extensions. Set 0 to functional normally.
# enable 8-bit dac: If set, allow VESA BIOS calls in IBM PC mode to set DAC width. Has no effect in PC-98 mode.
# high intensity blinking: Set to false if you want to see high-intensity background colors instead of blinking foreground text.
# This option has no effect in PC-98 and some other video modes.
# svga lfb base: If nonzero, define the physical memory address of the linear framebuffer.
# pci vga: If set, SVGA is emulated as if a PCI device (when enable pci bus=true).
# vga attribute controller mapping: This affects how the attribute controller maps colors, especially in 256-color mode.
# Some SVGA cards handle the attribute controller palette differently than most SVGA cards.
# auto Automatically pick the mapping based on the SVGA chipset.
# 4x4 Split into two 4-bit nibbles, map through AC, recombine. This is standard VGA behavior including clone SVGA cards.
# 4low Split into two 4-bit nibbles, remap only the low 4 bits, recombine. This is standard ET4000 behavior.
#
# NOTES:
# Demoscene executable 'COPPER.EXE' requires the '4low' behavior in order to display line-fading effects
# (including scrolling credits) correctly, else those parts of the demo show up as a blank screen.
#
# 4low behavior is default for ET4000 emulation.
# Possible values: , auto, 4x4, 4low, first16.
# enable supermegazeux tweakmode: If set, allow old MegaZeux 256-color text tweakmode aka 'Super MegaZeux mode'. Not all cards support this tweakmode.
# The ones that do are not emulated yet by DOSBox-X. It is not known at this time whether S3 chipsets support the hack.
# On normal cards the tweakmode does nothing but halve the text mode resolution without any other effects.
# Possible values: true, false, 1, 0, auto.
# vga bios use rom image: If set, load a VGA BIOS from a ROM image file. If clear, provide our own INT 10h emulation as normal.
# vga bios rom image: If set, load the VGA BIOS from the specified file (must be 1KB to 64KB in size).
# If left unset, and DOSBox-X is asked to load a VGA BIOS from a file, a file name
# is chosen automatically from the machine type. For example, Tseng ET4000 emulation
# (machine=svga_et4000) will look for et4000.bin. VGA BIOS ROM images can be dumped
# from real hardware or downloaded from the PCem ROMs collection.
#
# machine=svga_s3 TRIO64 (Ver. 1.5-07) [VGA] (S3 Incorporated).bin
# machine=svga_et4000 et4000.bin
# vga bios size override: VGA BIOS size override. Override the size of the VGA BIOS (normally 32KB in compatible or 12KB in non-compatible).
# video bios dont duplicate cga first half rom font: If set, save 4KB of EGA/VGA ROM space by pointing to the copy in the ROM BIOS of the first 128 chars
# video bios always offer 14-pixel high rom font: If set, video BIOS will always carry the 14-pixel ROM font. If clear, 14-pixel rom font will not be offered except for EGA/VGA emulation.
# video bios always offer 16-pixel high rom font: If set, video BIOS will always carry the 16-pixel ROM font. If clear, 16-pixel rom font will not be offered except for VGA emulation.
# video bios enable cga second half rom font: If set, and emulating CGA/PCjr/Tandy, automatically provide the second half of the 8x8 ROM font.
# This setting is ignored for EGA/VGA emulation. If not set, you will need a utility like GRAFTABL.COM to load the second half of the ROM font for graphics.
# NOTE: if you disable the 14 & 16 pixel high font AND the second half when machine=cga, you will disable video bios completely.
# forcerate: Force the VGA framerate to a specific value(ntsc, pal, or specific hz), no matter what
# sierra ramdac: Whether or not to emulate a Sierra or compatible RAMDAC at port 3C6h-3C9h.
# Some DOS games expect to access port 3C6h to enable highcolor/truecolor SVGA modes on older chipsets.
# Disable if you wish to emulate SVGA hardware that lacks a RAMDAC or (depending on the chipset) does
# not emulate a RAMDAC that is accessible through port 3C6h. This option has no effect for non-VGA video hardware.
# sierra ramdac lock 565: When emulating High Sierra highcolor RAMDAC, assume 5:6:5 at all times if set. Else,
# bit 6 of the DAC command selects between 5:5:5 and 5:6:5. Set this option for demos or
# games that got the command byte wrong (MFX Transgression 2) or any other demo that is
# not rendering highcolor 16bpp correctly.
# vga fill active memory: If set, DOSBox-X will fill inactive video memory regions with RAM rather than mapping them as empty. This allows the ETen Chinese DOS system (e.g. ET16V and ET24VA) to run.
# page flip debug line: VGA debugging switch. If set, an inverse line will be drawn on the exact scanline that the CRTC display offset registers were written.
# This can be used to help diagnose whether or not the DOS game is page flipping properly according to vertical retrace if the display on-screen is flickering.
# vertical retrace poll debug line: VGA debugging switch. If set, an inverse green dotted line will be drawn on the exact scanline that the CRTC status port (0x3DA) was read.
# This can be used to help diagnose whether the DOS game is properly waiting for vertical retrace.
# cgasnow: When machine=cga, determines whether or not to emulate CGA snow in 80x25 text mode.
# This parameter is also changeable from the builtin CGASNOW command in CGA mode.
# vga 3da undefined bits: VGA status port 3BA/3DAh only defines bits 0 and 3. This setting allows you to assign a bit pattern to the undefined bits.
# The purpose of this hack is to deal with demos that read and handle port 3DAh in ways that might crash if all are zero.
# rom bios 8x8 CGA font: If set, or mainline DOSBox compatible BIOS mapping, a legacy 8x8 CGA font (first 128 characters) is stored at 0xF000:0xFA6E. DOS programs that do not use INT 10h to locate fonts might require that font to be located there.
# rom bios video parameter table: If set, or mainline DOSBox compatible BIOS mapping, DOSBox-X will emulate the video parameter table and assign that to INT 1Dh. If clear, table will not be provided.
# int 10h points at vga bios: If set, INT 10h points at the VGA BIOS. If clear, INT 10h points into the system BIOS. This option only affects EGA/VGA/SVGA emulation.
# This option is needed for some older DOS applications that make additional checks before detecting EGA/VGA hardware (SuperCalc).
# unmask timer on int 10 setmode: If set, INT 10h will unmask IRQ 0 (timer) when setting video modes.
# vesa bank switching window mirroring: If set, bank switch (windowed) VESA BIOS modes will ignore the window selection when asked
# to bank switch. Requests to control either Window A or Window B will succeed. This is needed
# for some demoscene productions with SVGA support that assume Window B is available, without
# which graphics do not render properly.
# If clear, Window B is presented as not available and attempts to use it will fail. Only Window A
# will be available, which is also DOSBox SVN behavior.
# vesa bank switching window range check: Controls whether calls to bank switch (set the window number) through the VESA BIOS apply
# range checking. If set, out of range window numbers will return with an error code. This
# is also DOSBox SVN behavior. If clear, out of range window numbers are silently truncated
# to a number within range of available video memory and allowed to succeed.
# This is needed for some demoscene productions that rely on the silent truncation to render
# correctly without which drawing errors occur (e.g. end credits of Pill by Opiate)
# vesa zero buffer on get information: This setting affects VESA BIOS function INT 10h AX=4F00h. If set, the VESA BIOS will zero the
# 256-byte buffer defined by the standard at ES:DI, then fill in the structure. If clear, only
# the structure members will be filled in, and memory outside the initial 20-32 bytes will remain
# unmodified. This setting is ON by default. Some very early 1990s DOS games that support VESA
# BIOS standards may need this setting turned OFF if the programmer did not provide enough space
# for the entire 256 byte structure and the game crashes if it detects VESA BIOS extensions.
# Needed for:
# GETSADAM.EXE
# vesa set display vsync: Whether to wait for vertical retrace if VESA Set Display Address is used to pan the display.
# The default value -1 will wait if vesa_oldvbe, or not otherwise. 0 means not to wait.
# 1 means always to wait. This affects only subfunction 0x00. Subfunction 0x80 will always wait
# as specified in the VESA BIOS standard.
# It is recommended to set this to 1 for VBETEST.EXE so that the panning test and information does not
# go by too fast.
# vesa lfb base scanline adjust: If non-zero, the VESA BIOS will report the linear framebuffer offset by this many scanlines.
# This does not affect the linear framebuffer's location. It only affects the linear framebuffer
# location reported by the VESA BIOS. Set to nonzero for DOS games with sloppy VESA graphics pointer management.
# MFX "Melvindale" (1996): Set this option to 2 to center the picture properly.
# vesa map non-lfb modes to 128kb region: If set, VESA BIOS SVGA modes will be set to map 128KB of video memory to A0000-BFFFF instead of
# 64KB at A0000-AFFFF. This does not affect the SVGA window size or granularity.
# Some games or demoscene productions assume that they can render into the next SVGA window/bank
# by writing to video memory beyond the current SVGA window address and will not appear correctly
# without this option.
# ega per scanline hpel: If set, EGA emulation allows changing hpel per scanline. This is reportedly the behavior
# of IBM EGA hardware according to DOSBox SVN and on by default. If clear, EGA emulation
# latches hpel on vertical retrace end (like VGA does), which may have been EGA clone behavior
# that some games were written against. Commander Keen episodes 4-6 need this option set to false when machine=ega.
# This option affects only EGA emulation. To change VGA hpel behavior, use the 'allow hpel effects' setting instead.
# allow hpel effects: If set, allow the DOS demo or program to change the horizontal pel (panning) register per scanline.
# Some early DOS demos use this to create waving or sinus effects on the picture. Not very many VGA
# chipsets allow this, so far, only ATI chipsets are known to support this effect. Disabled by default.
# allow hretrace effects: If set, allow the DOS demo or program to make the picture wavy by playing with the 'start horizontalretrace' register of the CRTC during the active picture. Some early DOS demos (Copper by Surprise!productions) need this option set for some demo effects to work. Disabled by default.
# hretrace effect weight: If emulating hretrace effects, this parameter adds 'weight' to the offset to smooth it out.
# the larger the number, the more averaging is applied. This is intended to emulate the inertia
# of the electron beam in a CRT monitor
# vesa modelist cap: IF nonzero, the VESA modelist is capped so that it contains no more than the specified number of video modes.
# vesa modelist width limit: IF nonzero, VESA modes with horizontal resolution higher than the specified pixel count will not be listed.
# This is another way the modelist can be capped for DOS applications that have trouble with long modelists.
# vesa modelist height limit: IF nonzero, VESA modes with vertical resolution higher than the specified pixel count will not be listed.
# This is another way the modelist can be capped for DOS applications that have trouble with long modelists.
# vesa vbe put modelist in vesa information: If set, the VESA modelist is placed in the VESA information structure itself when the DOS application
# queries information on the VESA BIOS. Setting this option may help with some games, though it limits
# the mode list reported to the DOS application.
# vesa vbe 1.2 modes are 32bpp: If set, truecolor (16M color) VESA BIOS modes in the 0x100-0x11F range are 32bpp. If clear, they are 24bpp.
# Some DOS games and demos assume one bit depth or the other and do not enumerate VESA BIOS modes, which is why this
# option exists. If set to auto, this is determined by the type of SVGA chipset emulated.
# Possible values: true, false, 1, 0, auto.
# allow low resolution vesa modes: If set, allow low resolution VESA modes (320x200x16/24/32bpp and so on). You could set this to false to simulate
# SVGA hardware with a BIOS that does not support the lowres modes for testing purposes.
# allow explicit 24bpp vesa modes: If set, additional 24bpp modes are listed in the modelist regardless whether modes 0x100-0x11F are
# configured to be 24bpp or 32bpp. Setting this option can provide the best testing and development
# environment for new retro DOS code. If clear, 24bpp will only be available in the 0x100-0x11F range
# if the "vesa vbe 1.2 modes are 32bpp" is false. Setting to false helps to emulate typical SVGA
# hardware in which either 24bpp is supported, or 32bpp is supported, but not both. Disabled by default.
# allow high definition vesa modes: If set, offer HD video modes in the VESA modelist (such as 1280x720 aka 720p or 1920x1080 aka 1080p).
# This option also offers 4:3 versions (960x720 and 1440x1080) for DOS games that cannot properly handle
# a 16:9 aspect ratio, and several other HD modes. The modes enabled by this option are still limited by the
# width and height limits and available video memory.
# This is unusual for VESA BIOSes to do and is disabled by default.
# allow unusual vesa modes: If set, unusual (uncommon) modes are added to the list. The modes reflect uncommon resolutions
# added by external drivers (UNIVBE), some VESA BIOSes, some laptop and netbook displays, and
# some added by DOSBox-X for additional fun. Disabled by default.
# allow 32bpp vesa modes: If the DOS game or demo has problems with 32bpp VESA modes, set to 'false'
# allow 24bpp vesa modes: If the DOS game or demo has problems with 24bpp VESA modes, set to 'false'
# allow 16bpp vesa modes: If the DOS game or demo has problems with 16bpp VESA modes, set to 'false'
# allow 15bpp vesa modes: If the DOS game or demo has problems with 15bpp VESA modes, set to 'false'
# allow 8bpp vesa modes: If the DOS game or demo has problems with 8bpp VESA modes, set to 'false'
# allow 4bpp vesa modes: If the DOS game or demo has problems with 4bpp VESA modes, set to 'false'.
# These modes have the same 16-color planar memory layout as standard VGA, but
# at SVGA resolution.
# allow 4bpp packed vesa modes: If the DOS game or demo has problems with 4bpp packed VESA modes, set to 'false'.
# 4bpp (16-color) packed is an unusual novelty mode only seen on specific Chips & Tech 65550
# VESA BIOSes such as the one in a Toshiba Libretto laptop. Disabled by default.
# allow tty vesa modes: If the DOS game or demo has problems with text VESA modes, set to 'false'
# double-buffered line compare: This setting affects the VGA Line Compare register. Set to false (default value) to emulate most VGA behavior
# Set to true for the value to latch once at the start of the frame.
# ignore vblank wraparound: DOSBox-X can handle active display properly if games or demos reprogram vertical blanking to end in the active picture area.
# If the wraparound handling prevents the game from displaying properly, set this to false. Out of bounds vblank values will be ignored.
#
# ignore extended memory bit: Some DOS applications use VGA 256-color mode but accidentally clear the extended memory
# bit originally defined to indicate whether EGA hardware has more than 64KB of RAM.
# Setting this option can correct for that. Needed for Mr. Blobby.
# enable vga resize delay: If the DOS game you are running relies on certain VGA raster tricks that affect active display area, enable this option.
# This adds a delay between VGA mode changes and window updates. It also means that if you are capturing a demo or game,
# that your capture will also show a few garbled frames at any point mode changes occur, which is why this option is disabled
# by default. If you intend to run certain DOS games and demos like DoWhackaDo, enable this option.
# resize only on vga active display width increase: If set, changes to the Display End register of the CRTC do not trigger DOSBox-X to resize its window
# IF the value written is less than the current value. Some demos like DoWhackaDo need this option set
# because of the way its raster effects work. If the DOSBox-X window rapidly changes size during a demo
# try setting this option. Else, leave it turned off. Changes to other VGA CRTC registers will trigger
# a DOSBox-X mode change as normal regardless of this setting.
# vga palette update on full load: If set, all three bytes of the palette entry must be loaded before taking the color,
# which is fairly typical SVGA behavior. If not set, partial changes are allowed.
# ignore odd-even mode in non-cga modes: Some demoscene productions use VGA Mode X but accidentally enable odd/even mode.
# Setting this option can correct for that and render the demo properly.
# This option forces VGA emulation to ignore odd/even mode except in text and CGA modes.
# ignore sequencer blanking: If set, ignore attempts to blank the display using the EGA/VGA sequencer registers.
# This should not be set except for DOS games with bugs in their display handling code.
# memory io optimization 1: Enable one class of EGA/VGA memory I/O optimizations. Default ON (true).
# If graphical artifacts or errors occur, try turning this off first. May provide a performance benefit.
# scanline render on demand: Render video output at vsync or when something is changed mid frame, instead of stopping to render every scanline.
# May provide a performance benefit to most DOS games. However this may also break timing-dependent game or Demoscene effects.
# Default auto, which will turn if off for VGA modes and turn it on for SVGA modes.
# Possible values: true, false, 1, 0, auto.
int 10h use video parameter table = auto
vmemdelay = 0
prevent capture =
vmemsize = -1
vmemsizekb = 0
vbe window granularity = 0
vbe window size = 0
enable 8-bit dac = true
high intensity blinking = true
svga lfb base = 0
pci vga = true
vga attribute controller mapping = auto
enable supermegazeux tweakmode =
vga bios use rom image = false
vga bios rom image =
vga bios size override = 0
video bios dont duplicate cga first half rom font = false