DOSBox-X release 0.82.3 2018-02-15 22:26 Windows Async hack

• PC-98 FM synthesis fixed not to initialize itself
  again when rebooting, which fixes a problem with
  garbled FM synthesis after rebooting.
• Removed some now-unnecessary SDL Video quit/init
  calls from Windows builds.
• machine=pc98 now starts entire emulation in PC-98
  mode instead of booting up in IBM PC mode and
  switching to PC-98 mode.
• Initial "BIOS" startup screen now operates in
  PC-98 mode when machine=pc98.

DOSBox-X release 0.82.3 2018-02-15 22:26

• PC-98 FM synthesis fixed not to initialize itself
  again when rebooting, which fixes a problem with
  garbled FM synthesis after rebooting.
• Removed some now-unnecessary SDL Video quit/init
  calls from Windows builds.
• machine=pc98 now starts entire emulation in PC-98
  mode instead of booting up in IBM PC mode and
  switching to PC-98 mode.
• Initial "BIOS" startup screen now operates in
  PC-98 mode when machine=pc98.

DOSBox-X release 0.82.3 2018-02-13 23:12 Windows Async hack

0.82.3 (02/13/2018)

• Removed DOSBox SVN-style "fast" A20 gate emulation.
  Recent changes make it infeasible to keep. "fast" is
  now mapped to "mask" mode.
• RAM aliasing is now always on, even if memalias is not
  set, in order to help enforce A20 gate behavior, and
  to fix emulator crashes when a non-aliased RAM page
  is referenced through an alias.
• Cleanup and rewrite of prefetch core, to make the code
  cleaner and more readable and maintainable.
• DOS file I/O updated to apply a proper delay rather
  than the old DOSBox SVN code's cycle count dependent
  method. The delay by default will slow disk I/O down
  to mid 1990's IDE PIO speeds, which can resolve issues
  with MS-DOS demoscene or game executables that can
  malfunction when disk I/O is too fast.
• PIC code updated to enforce a proper IRQ delay on ALL
  IRQ signals, which fixes issues with MS-DOS executables
  that have race conditions between their code and their
  interrupt handlers.
• DOS Shell now shows the full intro text only at first
  run, instead of every shell invocation.
• Use FCB record size of 128 bytes if the FCB record size
  is zero (from DOSBox SVN).
• PC speaker fix not to generate a continuous tone if
  the PIT timer was set to mode 0. This fixes issues with
  many early 1990s demoscene executables leaving the PC
  speaker enabled (BEEEEEEP).
• Register DEBUGBOX.COM at DOS environment start instead
  of boot, which allows the command to work again.
• EXE loader sets stack pointer (SS:SP) into PSP segment
  (from DOSBox SVN)
• EXE loader fixed to use the larger of the minimum and
  maximum memory sizes listed in the EXE header, which
  fixes some demoscene executables with a minimum size
  larger than maximum.
• VGA DAC (palette) emulation updated to better match
  actual SVGA chipset (Paradise SVGA) behavior, which
  fixes some VGA palette errors in some demoscene
  productions.
• Added -nocachedir option to internal MOUNT command, to
  disable directory caching for a local folder mounted
  to a drive letter. When mounted this way, changes on
  the host filesystem are immediately visible in the
  guest DOS environment.
• Added -ro and -rw options to internal MOUNT command, to
  allow mounting local folders to a drive letter as a
  read-only volume.
• MIDI Fluidsynth fixed to initialize and free state properly
  so that switching to and from Fluidsynth doesn't cause
  a segfault or crash.
• MPU-401 fixed to allow changes to MIDI configuration from
  CONFIG.COM.
• DOS filename handling fixed to maintain ASCII conversion
  to uppercase, while not converting Shift-JIS double-byte
  characters in PC-98 mode. This fixes Shift-JIS filename
  corruption when the trailing byte can be mistaken for
  lowercase ASCII a to z.
• Windows fixes to keep menu bar items updated with
  DOSBox-X state.
• Remove WM_DROPFILES handling, for now. The code remains
  to allow re-enabling later.
• SDL 1.x builds fixed to process only WM_COMMAND (menu
  bar) and WM_SYSCOMMAND (system menu) events so that
  the general chatter in modern Windows system does not
  drown out the messages. This fixes issues where the
  menu bar doesn't work on some systems.
• SDL 1.x builds fixed to handle menu bar input using
  SDL's WM events instead of fighting with SDL's message
  pump to receive menu events. This fixes potential
  issues with losing menu bar events.
• dosbox.conf reference included with Windows builds
  now uses MS-DOS line endings so that the file can be
  edited in NOTEPAD.EXE
• New dosbox.conf option to control whether the menu is
  shown by default in Windows builds.
• titlebar= SDL dosbox.conf option, to allow showing a more
  user friendly name for the program instead of just using
  the EXE name.
• E_Exit() on Windows now displays the message using
  MessageBox() in addition to sending to STDERR, so that
  Windows users see the error even if they are running
  it from the desktop instead of the command line.
• PC-98 EGC bit shifter emulation fixed to correctly support
  ascending and descending bit shifting in either direction.
  This fixes screen shake emulation errors with Touhou Project
  TH04 and TH05.
• Linux/X11 fixes to SDL 1.x to better match and compare
  Visuals (descriptions of the screen) since X11 libraries
  don't seem to use the same pointer values for the same
  Visuals.
• ALT+TAB or loss of focus from fullscreen in Windows now
  restores the window instead of minimizing it.
• 3Dfx OpenGL will hide the minimize and maximize buttons
  in Windows while active.
• Windows menu bar items are now grayed out when 3Dfx OpenGL
  emulation is active (items that cannot be used at that time).
• Fix Windows system menu to always keep "show menu".
• GFX rendering fixed not to render any output while 3Dfx
  OpenGL emulation is active.
• 3Dfx OpenGL bug fixes to properly restore the DOS console
  when the 3Dfx card is de-initialized and the game returns
  to the DOS prompt.
• Linux/X11 window output fixed to keep the window on the
  screen even when switching between OpenGL and non-OpenGL,
  and when setting the SDL video mode.
• Remove some init hacks and SDL forced reinitialized hacks,
  so that the window is stable on the screen.
• Added code to do more OpenGL state initialization (both
  output=opengl and when initializing 3Dfx OpenGL emulation)
  to make more consistent output.
• 3Dfx voodoo OpenGL based emulation fixed to switch out of
  fullscreen mode IF DOSBox-X was fullscreen at the time the
  card is initialized.
• 3Dfx voodoo OpenGL based emulation no longer allows fullscreen
  mode, and does everything it can to prevent window resizing.
• Linux/X11 disable XRandR, XV, and X modeset functions. Do not
  change monitor resolution.
• MPU-401 MIDI emulation fixed to look at all conductor message
  bytes for code 0xFC (ALL END) instead of just the first byte.
  This fixes hangs in games that send additional bytes prior to
  0xFC and then expect the MPU-401 to signal 0xFC back when the
  games are waiting for music to stop.
• Fix DOS CON driver not to signal data ready for PC-98 scan
  codes that have no corresponding ANSI code. Tapping numeric
  keypad keys during the title screen in Touhou Project should
  no longer cause the game to pause waiting for keyboard input
  when going into demo mode.
• Fix DOS CON driver to signal data ready for buffered escape
  code.
• Fix PC-98 keyboard emulation not to apply IBM PC "extended"
  keyboard scancode filtering.
• Window maximization does not count as a user resize preference.
• Fix Windows builds to enable DirectSerial, Direct LPT, modem,
  emulation.
• New mapper shortcut to restore the window's original size.
• Fix bug with SHL instruction and OF flag, which corrects some
  games and their decompression routines.
• Fullscreen (monitor) modesetting removed. DOSBox-X either runs
  in a window, or scales up to fill the monitor, but will not change
  the monitor resolution.
• Resize handling fixed to differentiate user resize verses resize
  caused by DOSBox-X changing the window dimensions.
• Linux/X11 fixes to avoid flickering when resizing the window, and
  to avoid redrawing unless necessary.
• Window resize management, to scale/arrange the output to fit the
  window (for output= surface, opengl, direct3d)
• Enable resizing again, except when the GUI or mapper is active.
• Fix Linux/X11 to always take resize events, instead of ignoring
  all further resize events just because one resize event is forever
  "pending"
• Linux/X11 builds now track the size of the window on the desktop,
  to keep track of resizing and maximizing.

DOSBox-X release 0.82.3 2018-02-13 23:12

0.82.3 (02/13/2018)

• Removed DOSBox SVN-style "fast" A20 gate emulation.
  Recent changes make it infeasible to keep. "fast" is
  now mapped to "mask" mode.
• RAM aliasing is now always on, even if memalias is not
  set, in order to help enforce A20 gate behavior, and
  to fix emulator crashes when a non-aliased RAM page
  is referenced through an alias.
• Cleanup and rewrite of prefetch core, to make the code
  cleaner and more readable and maintainable.
• DOS file I/O updated to apply a proper delay rather
  than the old DOSBox SVN code's cycle count dependent
  method. The delay by default will slow disk I/O down
  to mid 1990's IDE PIO speeds, which can resolve issues
  with MS-DOS demoscene or game executables that can
  malfunction when disk I/O is too fast.
• PIC code updated to enforce a proper IRQ delay on ALL
  IRQ signals, which fixes issues with MS-DOS executables
  that have race conditions between their code and their
  interrupt handlers.
• DOS Shell now shows the full intro text only at first
  run, instead of every shell invocation.
• Use FCB record size of 128 bytes if the FCB record size
  is zero (from DOSBox SVN).
• PC speaker fix not to generate a continuous tone if
  the PIT timer was set to mode 0. This fixes issues with
  many early 1990s demoscene executables leaving the PC
  speaker enabled (BEEEEEEP).
• Register DEBUGBOX.COM at DOS environment start instead
  of boot, which allows the command to work again.
• EXE loader sets stack pointer (SS:SP) into PSP segment
  (from DOSBox SVN)
• EXE loader fixed to use the larger of the minimum and
  maximum memory sizes listed in the EXE header, which
  fixes some demoscene executables with a minimum size
  larger than maximum.
• VGA DAC (palette) emulation updated to better match
  actual SVGA chipset (Paradise SVGA) behavior, which
  fixes some VGA palette errors in some demoscene
  productions.
• Added -nocachedir option to internal MOUNT command, to
  disable directory caching for a local folder mounted
  to a drive letter. When mounted this way, changes on
  the host filesystem are immediately visible in the
  guest DOS environment.
• Added -ro and -rw options to internal MOUNT command, to
  allow mounting local folders to a drive letter as a
  read-only volume.
• MIDI Fluidsynth fixed to initialize and free state properly
  so that switching to and from Fluidsynth doesn't cause
  a segfault or crash.
• MPU-401 fixed to allow changes to MIDI configuration from
  CONFIG.COM.
• DOS filename handling fixed to maintain ASCII conversion
  to uppercase, while not converting Shift-JIS double-byte
  characters in PC-98 mode. This fixes Shift-JIS filename
  corruption when the trailing byte can be mistaken for
  lowercase ASCII a to z.
• Windows fixes to keep menu bar items updated with
  DOSBox-X state.
• Remove WM_DROPFILES handling, for now. The code remains
  to allow re-enabling later.
• SDL 1.x builds fixed to process only WM_COMMAND (menu
  bar) and WM_SYSCOMMAND (system menu) events so that
  the general chatter in modern Windows system does not
  drown out the messages. This fixes issues where the
  menu bar doesn't work on some systems.
• SDL 1.x builds fixed to handle menu bar input using
  SDL's WM events instead of fighting with SDL's message
  pump to receive menu events. This fixes potential
  issues with losing menu bar events.
• dosbox.conf reference included with Windows builds
  now uses MS-DOS line endings so that the file can be
  edited in NOTEPAD.EXE
• New dosbox.conf option to control whether the menu is
  shown by default in Windows builds.
• titlebar= SDL dosbox.conf option, to allow showing a more
  user friendly name for the program instead of just using
  the EXE name.
• E_Exit() on Windows now displays the message using
  MessageBox() in addition to sending to STDERR, so that
  Windows users see the error even if they are running
  it from the desktop instead of the command line.
• PC-98 EGC bit shifter emulation fixed to correctly support
  ascending and descending bit shifting in either direction.
  This fixes screen shake emulation errors with Touhou Project
  TH04 and TH05.
• Linux/X11 fixes to SDL 1.x to better match and compare
  Visuals (descriptions of the screen) since X11 libraries
  don't seem to use the same pointer values for the same
  Visuals.
• ALT+TAB or loss of focus from fullscreen in Windows now
  restores the window instead of minimizing it.
• 3Dfx OpenGL will hide the minimize and maximize buttons
  in Windows while active.
• Windows menu bar items are now grayed out when 3Dfx OpenGL
  emulation is active (items that cannot be used at that time).
• Fix Windows system menu to always keep "show menu".
• GFX rendering fixed not to render any output while 3Dfx
  OpenGL emulation is active.
• 3Dfx OpenGL bug fixes to properly restore the DOS console
  when the 3Dfx card is de-initialized and the game returns
  to the DOS prompt.
• Linux/X11 window output fixed to keep the window on the
  screen even when switching between OpenGL and non-OpenGL,
  and when setting the SDL video mode.
• Remove some init hacks and SDL forced reinitialized hacks,
  so that the window is stable on the screen.
• Added code to do more OpenGL state initialization (both
  output=opengl and when initializing 3Dfx OpenGL emulation)
  to make more consistent output.
• 3Dfx voodoo OpenGL based emulation fixed to switch out of
  fullscreen mode IF DOSBox-X was fullscreen at the time the
  card is initialized.
• 3Dfx voodoo OpenGL based emulation no longer allows fullscreen
  mode, and does everything it can to prevent window resizing.
• Linux/X11 disable XRandR, XV, and X modeset functions. Do not
  change monitor resolution.
• MPU-401 MIDI emulation fixed to look at all conductor message
  bytes for code 0xFC (ALL END) instead of just the first byte.
  This fixes hangs in games that send additional bytes prior to
  0xFC and then expect the MPU-401 to signal 0xFC back when the
  games are waiting for music to stop.
• Fix DOS CON driver not to signal data ready for PC-98 scan
  codes that have no corresponding ANSI code. Tapping numeric
  keypad keys during the title screen in Touhou Project should
  no longer cause the game to pause waiting for keyboard input
  when going into demo mode.
• Fix DOS CON driver to signal data ready for buffered escape
  code.
• Fix PC-98 keyboard emulation not to apply IBM PC "extended"
  keyboard scancode filtering.
• Window maximization does not count as a user resize preference.
• Fix Windows builds to enable DirectSerial, Direct LPT, modem,
  emulation.
• New mapper shortcut to restore the window's original size.
• Fix bug with SHL instruction and OF flag, which corrects some
  games and their decompression routines.
• Fullscreen (monitor) modesetting removed. DOSBox-X either runs
  in a window, or scales up to fill the monitor, but will not change
  the monitor resolution.
• Resize handling fixed to differentiate user resize verses resize
  caused by DOSBox-X changing the window dimensions.
• Linux/X11 fixes to avoid flickering when resizing the window, and
  to avoid redrawing unless necessary.
• Window resize management, to scale/arrange the output to fit the
  window (for output= surface, opengl, direct3d)
• Enable resizing again, except when the GUI or mapper is active.
• Fix Linux/X11 to always take resize events, instead of ignoring
  all further resize events just because one resize event is forever
  "pending"
• Linux/X11 builds now track the size of the window on the desktop,
  to keep track of resizing and maximizing.

DOSBox-X beta 2018-02-08 0137 Windows asynchronous window handling hack

• DOS filename handling fixed to retain uppercase conversion while not corrupting Shift-JIS double-byte characters
• MIDI settings can now be changed at runtime using CONFIG.COM
• Fluidsynth bugfix to correct segfault when switching to and from Fluidsynth MIDI output more than once
• Added -ro option to MOUNT.COM to allow mounting local folders read-only.
• Added -nocachedir option to MOUNT.COM to disable caching local file information when mounting a local folder.

DOSBox-X beta 2018-02-08 0137

• DOS filename handling fixed to retain uppercase conversion while not corrupting Shift-JIS double-byte characters
• MIDI settings can now be changed at runtime using CONFIG.COM
• Fluidsynth bugfix to correct segfault when switching to and from Fluidsynth MIDI output more than once
• Added -ro option to MOUNT.COM to allow mounting local folders read-only.
• Added -nocachedir option to MOUNT.COM to disable caching local file information when mounting a local folder.

DOSBox-X beta 2018-02-05 2339 Windows asynchronous window handling hack

• New code to force 3Dfx OpenGL initial state to use GL_SMOOTH shading
• Linux/X11 bug fixes, including detection of Visual format change and code to keep the window on the screen even during SDL video mode changes
• PC-98: EGC bit shifter fixes and corrections. Screen shake in Touhou Project is emulated correctly now without errors
• PC-98: It turns out that the "page flipping" bit in PC-98 hardware is NOT double buffered and changes take effect immediately, therefore tearlines caused by page flipping mid-frame are normal. However, a hack to delay page flipping to vertical retrace to possibly alleviate tearlines is available.
• Fixed 3Dfx OpenGL code to prevent resizing at all costs including removal of the minimize button in the Windows title bar area
• Added code to disable (gray out) menu bar items that are not available while 3Dfx OpenGL emulation is running.
• Windows: Fatal errors (E_Exit) now display a message box in addition to sending to stderr, so that users who run the game without the command prompt can know what went wrong instead of DOSBox-X just disappearing suddenly from the desktop.
• New titlebar= dosbox.conf option to replace the running program name with a user defined string, if desired. (emendelson)
• New dosbox.conf option to control whether the Windows menu bar is initially visible.
• Fixed Windows builds to use SDL's system WM events instead of fighting the SDL message pump over menu (WM_COMMAND) events.
• dosbox.reference.conf now uses MS-DOS (CR LF) line endings so that it can be edited on Windows systems using NOTEPAD.EXE

DOSBox-X beta 2018-02-05 2339

• New code to force 3Dfx OpenGL initial state to use GL_SMOOTH shading
• Linux/X11 bug fixes, including detection of Visual format change and code to keep the window on the screen even during SDL video mode changes
• PC-98: EGC bit shifter fixes and corrections. Screen shake in Touhou Project is emulated correctly now without errors
• PC-98: It turns out that the "page flipping" bit in PC-98 hardware is NOT double buffered and changes take effect immediately, therefore tearlines caused by page flipping mid-frame are normal. However, a hack to delay page flipping to vertical retrace to possibly alleviate tearlines is available.
• Fixed 3Dfx OpenGL code to prevent resizing at all costs including removal of the minimize button in the Windows title bar area
• Added code to disable (gray out) menu bar items that are not available while 3Dfx OpenGL emulation is running.
• Windows: Fatal errors (E_Exit) now display a message box in addition to sending to stderr, so that users who run the game without the command prompt can know what went wrong instead of DOSBox-X just disappearing suddenly from the desktop.
• New titlebar= dosbox.conf option to replace the running program name with a user defined string, if desired. (emendelson)
• New dosbox.conf option to control whether the Windows menu bar is initially visible.
• Fixed Windows builds to use SDL's system WM events instead of fighting the SDL message pump over menu (WM_COMMAND) events.
• dosbox.reference.conf now uses MS-DOS (CR LF) line endings so that it can be edited on Windows systems using NOTEPAD.EXE

DOSBox-X beta 2018-02-03 20:47 Windows asynchronous window handling hack

• 3Dfx OpenGL state cleanup
• output=opengl state cleanup
• Eliminated OpenGL output kludge that resets state by forcing SDL to shutdown and reinitialize video driver
• Other cleanup
• Losing focus in fullscreen mode now restores the window instead of minimizing it

DOSBox-X beta 2018-02-03 20:28

• 3Dfx OpenGL state cleanup
• output=opengl state cleanup
• Eliminated OpenGL output kludge that resets state by forcing SDL to shutdown and reinitialize video driver
• Other cleanup
• Losing focus in fullscreen mode now restores the window instead of minimizing it

EDIT: The older release was replaced with this version to add restore on loss of focus