DOSBox-X 0.83.20 2021-11-30 23:26

Note: Installation instructions are available from the INSTALL page. Also, always check out the DOSBox-X homepage for latest updates.

For usage information please look at the DOSBox-X user guide, which is available from the DOSBox-X Wiki.

For Windows users, it is recommended to use the Windows installer(s) for a more complete installation.

0.83.20

• Release notes for this version:
  https://dosbox-x.com/release-0.83.20.html
• Implemented support for Pentium II cputype (with
  the setting "cputype=pentium_ii" in [cpu] section),
  and added Pentium II SYSENTER/SYSEXIT instructions
  to normal core and debugger disassembler. The two
  instructions are supported for Pentium II cputype.
  CPUID for Pentium II will now report stepping 3 and
  model 3 which is a minimum requirement for OSes to
  attempt to use SYSENTER/SYSEXIT. Silencing for
  RDMSR/WRMSR and SYSENTER/SYSEXIT debug messages is
  removed while CPU "debug spew" is silenced by
  default. MSRs related to Intel microcode are added
  because both Linux and Windows ME probe those MSRs
  if Pentium II emulation reports stepping 3 model 3.
  The microcode MSRs are silently ignored. Moreover,
  the MSR register 0x0000001B has been added to
  Pentium II emulation. DOSBox-X does not emulate a
  local APIC but Windows ME assumes that MSR is
  present and reads/writes it on startup if DOSBox-X
  reports itself as a Pentium II. (joncampbell123)
• Added support for DCGA and Toshiba J-3100 emulation
  modes by importing code from DOSVAXJ3 by nanshiki.
  The J-3100 emulation mode can be enabled with the
  option "dosv=jp" along with a non-off setting of
  "j3100" option in [dosv] section. For example, with
  "j3100=on" or "j3100=auto" (and "dosv=jp") J-3100
  system will be enabled and activated at start. With
  "j3100=manual" (and "dosv=jp") J-3100 system will
  be enabled and not activated at start, but there is
  now a DCGA command to enter DCGA (either English or
  J-3100 DCGA, depending on if J-3100 is enabled)
  mode from other video modes. (nanshiki & Wengier)
• Added support for unit tests based on Google Test
  framework (gTest/gMock) to ensure code stability.
  Unit tests can be started with command-line option
  "-tests" in the debug builds. Some unit tests are
  ported from DOSBox Staging. (Wengier)
• Added SERIAL and PARALLEL commands to view/change
  the current configuration of serial/parallel ports.
  Type "SERIAL /?" and "PARALLEL /?" for further info
  about the two commands. Commands like "config -set
  serial?=..." and "config -set parallel?=..." will
  also auto-call these commands. (sduensin & Wengier)
• Added IMGSWAP command to swap disks for drives.
  e.g. "IMGSWAP D" to swap D: drive to the next swap
  position, and "IMGSWAP A 3" to swap A: drive to
  the 3nd swap position. (Wengier)
• Added DOS commands including COMP, DISKCOPY, EDLIN,
  FC, FILES, PRINT, and SHUTDOWN (most from FreeDOS)
  to the built-in Z: drive. Updated or recompiled
  EDIT and EDLIN commands to support LFNs. (Wengier)
• The CAPMOUSE command without a parameter now shows
  whether the mouse is captured/released. (Wengier)
• The command "config -set" is now case-insensitive
  for property names. Also, if an option cannot be
  changed at run-time, DOSBox-X will ask whether to
  restart itself to apply the new setting. (Wengier)
• Do not read real-mode data areas from mouse event
  handling if running a protected mode guest OS like
  Windows NT, and disable INT 33h functions when DOS
  kernel is shut down to boot into a guest OS. Moving
  mouse while Windows NT is running should no longer
  cause page faults and crashes. (joncampbell123)
• The setting "mountwarning = false" will now silence
  more warning messages during mounting. (Wengier)
• The code page setting of "country" option will now
  be ignored for PC-98, JEGA and DOS/V modes. These
  modes will enforce the desired code page. (Wengier)
• Added support for loading the ASC16/ASCFONT.15/
  ASC24/ASCFONT.24? font files from the UCDOS/ETen
  Chinese DOS systems for the options "fontxsbcs",
  "fontxsbcs16" and "fontxdbcs24" in [dosv] section
  of the config file for DOS/V systems. (Wengier)
• Improved auto-detection of box-drawing characters
  when using DBCS code pages. (Wengier)
• Applied UTF-8 conversions to file browse dialog
  boxes for selecting files containing Unicode
  characters (e.g. CJK characters). (Wengier)
• For screenshot and MIDI/OPL recording, DOSBox-X
  will now display a message box showing the saved
  file name when the recording has been completed.
  The full paths will also be logged. (Wengier)
• Added confirmation message while trying to load a
  Direct3D pixel shader which may not be needed or
  may have undesired effect. (Wengier)
• Added warning message if DOS/V or Japanese PC-98/AX
  machine type is selected and a language file with
  an incompatible code page is specified. (Wengier)
• Added "AMD K6 166 MHz", "AMD K6 200 MHz" and "AMD
  K6-2 300 MHz" menu options within the menu group
  "Emulate CPU speed" (under "CPU"). (Wengier)
• Added a TrueType font selection page into Windows
  installer, which will show when TrueType font (TTF)
  output is selected for new installations. (Wengier)
• Added MMX instruction PSHUFW and added typecasts
  to some MMX instructions in case compilers cannot
  properly shift uint64_t by uint8_t otherwise. Most
  Pentium-level MMX instructions (such as MOVD, MOVQ,
  and EMMS) are added to the debugger disassembler
  and support for the disassembler to represent MMX
  registers. (joncampbell123)
• Added code to normal core to flush paging TLB
  whenever handing a non-recursive guest page fault.
  The guest OS will likely update the page tables
  to resolve the fault. The Linux kernel will
  constantly get "stuck" whenever you run a command
  without this change. (joncampbell123)
• Added code to make sure DOS kernel drives and drive
  letters have been unmounted and deallocated before
  booting a guest OS or shutting down DOSBox-X
  (joncampbell123).
• Added ability to change floppy images with drive
  number (0 or 1) only. (Wengier)
• Added INT 13h AH=16h, detect disk change. This can
  be controlled by config option "int 13 disk change
  detect" (in [dos] section) in case any older OS can
  not handle it. INT 13h AH=15h will report a floppy
  drive with change line support if enabled. MS-DOS
  seems to work just fine with it. (joncampbell123)
• Added menu item "Enable extended Chinese character
  set" in "Video" => "TTF options" to toggle setting
  for the Simplified Chinese (GBK extension) and
  Traditional Chinese (ChinaSea extension). (Wengier)
• Added config option "chinasea" (in [ttf] section)
  which when set to "true" allows ChinaSea (中國海字集)
  and Big5-2003 extension of the original Big5-1984
  charset for Traditional Chinese TTF output. This
  requires the use of a TTF/OTF font containing such
  extended characters to correctly render them; the
  included SarasaGothicFixed TTF font is updated to
  support such characters.Certain Traditional Chinese
  DOS software like the Hyper Editor 5.03 (漢書5) makes
  use of ChinaSea characters. Also moved "gbk" config
  option from [dosv] to [ttf] section. (Wengier)
• Added config option "forcesquarecorner" (in [sdl]
  section) which when set to "true" will force to
  disable rounded corners on Windows 11. (Wengier)
• Added code to INT 18h emulation (IBM PC mode) to
  jump to ROM BASIC if the user provided an IBM
  ROM BASIC image to load. (joncampbell123)
• Added config option "ibm rom basic" in [dosbox]
  section which allows users to load a ROM image
  containing IBM PC ROM BASIC, for disk images
  and MS-DOS setups that need it. (joncampbell123)
• Added stub IBM ROM BASIC points in the BIOS area
  so that when BASIC(A).COM from MS-DOS 1.x and 2.x
  are run, a polite message is displayed instead of
  invalid code and crashes. (joncampbell123)
• 8086 and 80186 CPU types no longer check segment
  limits. (joncampbell123 & Allofich)
• Put in undocumented behavior in opcode 0x8e for
  8086 and 80186. (Allofich)
• Made 8086 treat opcodes C0,C1,C8,C9,F1 as aliases
  of C2,C3,CA,CB,F0, and opcodes 0x60-0x6F as aliases
  of opcodes 0x70-0x7F. (Allofich)
• Adjusted multiple-prefix bug for 8086/286 to only
  apply when REP or REPZ is used. (Allofich)
• Fixed 0x0F opcode being valid on 80186 core when
  it should be invalid. (Allofich)
• Fixed CGA modes to always use a character height
  of 8, rather than reading it from address 485h.
  Fixes corrupt graphics in the PC Booter version
  of Apple Panic. (Allofich)
• Fixed underflow when INT 13 AH=2 called for
  sector 0. (Allofich)
• Fixed infinite loop when trying to run a 32-bit
  program with the 8086 CPU type. (Allofich)
• Fixed INT 13h emulation to no longer call the DOS
  kernel "DriveManager" if the DOS kernel has been
  shutdown. This fixes memory corruption issues in
  the guest OS system run by the BOOT command that
  can occur when the "swap disks" command is used in
  the emulator. (joncampbell123)
• Fixed DTA memory leak from FAT driver if FAT drive
  was mounted when booting into a guest OS. (joncampbell123)
• Fixed a crash on unmount that occurs if IMGMOUNT
  is used to mount multiple floppy disk images to
  a drive letter. (joncampbell123)
• Fixed possible crash with printing. (jamesbond3142)
• Fixed possible freeze when shutting down Windows 9x
  after changing a CD image from the menu. (Wengier)
• Fixed the default U.S. keyboard layout for the
  HX-DOS build. (Wengier)
• Fixed copying full-screen or multi-line text from a
  DBCS codepage in TTF output or PC98 mode. (Wengier)
• Fixed possible crash at start with getsysfont=true
  when a font may not be obtained on some Chinese
  Windows systems. (Wengier)
• Fixed TTF color issue with some DOS GUI programs by
  initializing the color scheme when with default
  COLORS= setting in EGA or VGA mode. (Wengier)
• Fixed some Direct3D pixel shaders not working (such
  as GS2x and CRT-geom-blend). (Wengier & depaljas)
• Fixed config option windowposition=x,y not working
  in Linux/macOS SDL1 builds. (Wengier)
• Fixed copying files from the virtual drive Z: not
  working when using the 4DOS shell. (Wengier)
• Fixed some issues in MORE command. (Wengier)
• Fixed "DIR>NUL" freeze/crash when only disk or CD
  images are mounted. (nanshiki)
• Fixed BIOS screen when resetting the machine with a
  non-TTF output and DOS/V mode enabled. (Wengier)
• Fixed the key `/~ not working when IME is enabled
  on a non-Japanese keyboard. (Wengier)
• Fixed display glitches in the game "Continuing
  adventures of Cyberbox". (Wengier)
• Fixed unusable joystick with config options like
  joy1response1 set to certain values. (Baderian)
• Make memory B0000-B7FFF unmapped for the CGA
  emulation. Fixes "Backgammon 5.0" detecting that
  an MDA is also present when using CGA. (Allofich)
• Make floppy I/O delay separately configurable from
  hard drive delay, and make it slower than before
  by default. It is adjustable via the "floppy drive
  data rate limit" config option. (Allofich)
• Always return bit 6 of port 61h as set for PC and as
  clear for PCjr and Tandy. Allows Zaxxon to load in
  PC mode. (Allofich)
• Video emulation for PC-98 mode (for 400-line modes)
  is now 16:10 instead of 4:3. 480-line PC-98 modes
  are still 4:3. (joncampbell123)
• PC-98 EGC emulation: Add generic ope_xx handler for
  the remaining block of undefined/undocumented EGC
  ROPs. This fixes "Atomic Punker" which uses EGC ROP
  0xBE for sprite rendering. (joncampbell123)
• Don't run mouse setup code if there is no emulated
  mouse. (Allofich)
• Integrated commits from mainline (Allofich)
  • Add proper opl3 handling of the waveform select
    to dbopl.
  • Correct disassembly of some FPU instructions.