DOSBox-X menu rewrite WIP BETA 2018-05-06 17:54

This is a WIP release. This contains a lot of new code concerning the menu layout.

The menu handling system is being changed from one that loads a static Windows menu resource (IDR_MENU) to one that constructs a menu in a platform-independent manner.

The code is brand new and may have some bugs.

The menu framework concept:

• Components create a menu item by name, as an individual component
• The mapper automatically creates a menu item for each mapper shortcut registered at startup
• Lists of popup menus is defined by the menu item name
• Each menu list can refer to popup menus by name to enable levels of popups
• The final layout is defined in menu.cpp by name
• Components can change text, enable, checked, and shortcut text at any time, which is then reflected in the menu
• Windows builds map this to the Windows menu system
• Systems where menu support is not implemented, simply do not show a menu, but the menu is in memory anyway
• Menu items are then connected to a callback function, a mapper shortcut, or both

Look in menu.cpp for the char*[] string arrays that define menu layout by name. It's fairly straightforward.

Another additional feature, connected to the mapper, is that the mapper system automatically updates the menu item for a mapper shortcut when the key binding changes.

This eliminates the problem with DOSBox and DOSBox-X where the shortcut shown in the menu is only correct if the mapper shortcut is left at default.

In the new code, changing the key binding for a mapper shortcut should automatically update the menu.

A quick way to test this:

• Bring up the mapper
• Pick a menu item with a shortcut
• Locate the same shortcut in the mapper UI
• Click on the shortcut, to edit the binding
• Note the shortcut shown in the menu
• Change the binding modifiers
• Note the shortcut shown in the menu now, it should reflect your changes
• Delete the binding
• Note the shortcut shown in the menu, there should no longer be any shortcut
• Add a binding
• Note the shortcut shown in the menu, it should show your new binding.

Since menu item order is now defined in menu.cpp, rearranging the menu should be simple now and it should be possible to submit simple patches to do so.

The code only works with Windows at this time. The next major development step for this code is to try and produce identical menus under Mac OS X.

Mac OS X builds would benefit from having proper menus instead of the minimal and useless default provided by SDL.

Have fun. Please use the comments section of the commit this is assigned to for comments.

DOSBox-X release 0.82.6 2018-05-03 09:55

0.82.6

• Resizing the window in SDL 1.x Windows builds
  fixed to work correctly in the latest build
  (1803) of Windows 10. Prior to this fix, resizing
  the window on that build would quickly hit a deadlock
  that prevented the user from moving or resizing the
  window again after that point.
• PC-98 dosbox.conf option added to select between
  accurate key/shift mapping, vs an alternate mapping
  appropriate for US keyboards (Yksoft1)
• SDL 1.x for Linux/X11 modified to differentiate
  Ro and Yen keys despite X11 xkbmap apparently
  mapping both to the backslash. The keymap is
  queried to detect the scancodes at startup
  in order to return the correct SDLK constant.
• SDL 1.x and DOSBox-X mapper code updated to
  correctly map Ro, Yen, @ ^ ; : keys on a JP
  keyboard in Windows and Linux.
• PC-98 keyboard BIOS handling updated to generate
  ASCII codes according to PC-98 layout, instead
  of by US keyboard layout.
• Mapper updated to support @ (at sign) key,
  ^ (caret) key, and a few other keys that
  exist on JP keyboards.
• "Hold" modifier for mapper bindings fixed.
  It is now possible to tap the key again to
  release the hold.
• VHD differencing disk support added (Shane32)
• INT 18h AH=0Ah updated to support 20-line
  text mode. Some games use the 20-line text
  mode to space the text out vertically.
  Such games will display correctly now.
• INT 18h now maintains text layer state
  in BIOS data area byte 0x53C, just as
  the actual BIOS does.
• Added PC-98 INT 18h function AH=0Ah and
  AH=0Bh to support BIOS calls that enable
  "Simple Graphics" mode. This fixes
  problems with other games having vertical
  lines over the graphics, even though
  these games do not appear to use the
  simple graphics at all. (yksoft1)
• Added support for PC-98 "Simple Graphics"
  mode of text layer attribute bit 4. When
  enabled, the attribute bit 4 changes
  meaning from vertical line to a bit
  indicating that the 8-bit character is
  a low resolution 2x4 bitmap to be
  displayed in the text layer. This fixes
  score and status display in Carat.
• PC-98 INT 18h now implements AH=31h to
  report CRTC, text and graphics state and
  24khz/31khz video mode selection. This
  fix allows some games including Touhou
  Project to pace it's gameplay correctly
  in either video mode.
• MinGW HX DOS builds default to host key
  F12 again
• PC-98 mode now offers selection between
  24khz and 31khz video modes (yksoft1)
• KEYB.COM fixed to load only the fonts the
  ROM BIOS has allocated. This fixes a guest
  system crash if using KEYB.COM with
  machine=ega
• Moved host key to F11 for Windows. F12 is
  already taken by some internal debugging
  voodoo within Windows itself.
• DOSBox-X codebase now strongly encourages
  compilation with C++11, will become
  required soon.
• BOOT command fixed to make it possible to
  IMGMOUNT multiple floppies to drive 1, and
  boot from another disk in drive 0. This
  should enable the use of DOSBox-X with
  PC-98 games that expect to boot from drive
  A and the user to rotate through floppies
  in drive B.
• IMGMOUNT fixed to support mounting with no
  filesystems and multiple disk images, and
  using the "swap floppy" command to rotate
  through them.
• Added options to BOOT command that allows
  specifying multiple disk images and an option
  that says to swap disk images only through
  one drive.
• VHD dynamic support added (shane32)
• INT 10 AH=9 background color fixed in 256-color
  VGA modes.
• Intro text updated to reflect new default
  key bindings.
• Mapper shortcuts not in common use now exist
  without any default binding, and most existing
  default bindings are now associated with the
  "host" key.
• Added 4th modifier "host" key to the mapper.
  This "host" key is F12 by default. The intent
  is to eventually move most mapper shortcuts
  to some combination of F12 and another key,
  rather than many shortcuts scattered over the
  keyboard. Existing dosbox mapper files should
  continue to work.
• Renderer and 32bpp VGA display code fixed to
  reorder RGBA order for correct display on Intel
  Mac OS X systems. Mac OS X, on Intel systems,
  uses a strange BGRA 32bpp format that requires
  some adjustment on our part to display correctly.
• Added more 24bpp INT 10h VESA BIOS modes.
• Removed per-sector debug messages from VFD/FDD
  image support code.

DOSBox-X release 0.82.5 2018-04-18 23:51

0.82.5 (04/18/2018)

• Expanded memory manager memory copy fixed to
  enable A20 gate temporarily so that the copy
  works correctly.
• PC-98 FM board emulation now defaults to IRQ 12
  instead of IRQ 3. A lot of PC-98 games seem to
  have a strong preference for that IRQ with regard
  to FM music.
• PC-98 reset I/O port (F0h) fixed to emulate CPU
  reset according to the SHUT0 and SHUT1 state set
  by the guest. Normally writing port F0h is a
  signal to reset but SHUT0 and SHUT1 can be set to
  indicate alternate behavior. This fixes VEMM486.EXE
  (an expanded memory manager) and allows it to run,
  since this manager appears to reset by port F0h
  then resume execution normally. Prior to this fix,
  booting a MS-DOS disk image that loads VEMM486.EXE
  at startup yielded nothing but an infinite reboot
  loop.
• XMS and EMS emulation fixed not to leave A20 gate
  enabled unless EMS emulation is set to EMM386 and
  dosbox.conf is set to run the system in virtual
  8086 mode. There are plenty of DOS games that
  malfunction if loaded too low in memory with the
  A20 gate enabled.
• PC-98 mouse emulation, at the 8255 level, now uses
  new C++ abstraction that seems to work fairly well
  even with the common PC-98 MOUSE.COM driver.
• "BOOT" command in PC-98 mode updated to no longer
  require the --force switch. Booting MS-DOS from a
  hard disk or floppy disk image in PC-98 mode is
  generally functional now.
• Added PC-98 SCSI/SASI hard disk emulation, and fixed
  BOOT to enable booting PC-98 MS-DOS from a hard drive
  (HDI image)
• FAT driver fixed to read/write logical sectors vs
  actual drive sectors and removed geometry remapping
  hack.
• FAT driver fixed to avoid memory corruption that
  may occur if reading a partition table from a drive
  that has more than 512 bytes/sector.
• .BAT file parsing fixed to handle BAT files not
  in the current directory (yksoft1)
• Fixed floppy controller emulation bug that failed
  to advance sectors during multi-sector read/write.
• Fixed floppy emulation bug that prevented seeking.
  The "head" would get stuck at track 0 and never move.
• Dynamic core allows running with paging enabled again,
  IF dosbox.conf says to allow it (yksoft1)
• DOS file I/O functions AH=3Fh and AH=40h updated to
  reflect undocumented MS-DOS behavior that silently
  truncates read/written byte count if the offset
  and byte count reach beyond the end of a 64KB segment.
  This fixes some demoscene productions that read 64KB-1
  bytes but apparently rely on this behavior to avoid
  display errors.
• FluidSynth fixes and API updates. DOSBox-X no longer
  uses a private API within FluidSynth. (heftig)
• Added dosbox.conf option to control the size of the
  DOS "Swappable Data Area" which is said to help with
  shelling and task swapping in WordPerfect 5.x and 6.x
• Added "minimum mcb free", and set minimum mcb segment to
  value same or similar to DOSBox SVN. The "free" option
  directs DOSBox-X to allocate memory before that segment
  value to fill memory.
• Fixed COMMAND.COM PSP segment to correctly identify it's
  resident size in memory.
• COMMAND.COM in the DOSBox shell now allocates itself
  normally instead of from a special segment so that it
  appears normally in the MCB allocation chain.
• BIOS now clears it's stack before booting the DOS shell.
• Fix Pause (CTRL+Pause or ALT+Pause) to release all keys
  in the mapper so that CTRL, ALT, or Shift are not left
  "stuck" when emulation resumes.
• Initial host keyboard recognition, and base framework
  for general keyboard language/layout handling. Keyboard
  layout recognition added for Windows and Linux/X11.
• Fixed 350-line INT 10h VESA modes not to apply EGA mode
  adjustments, which fixes display distortion.
• INT 10h VESA modes 720x480 and 848x480 fixed.
• Fixed INT 10h VESA emulation to round up bytes/scanline
  so that 4bpp planar modes display properly.
• Fixed INT 10h VESA mode 1400x1050 16-color (4bpp planar)
  mode to resolve overlapping mode number.
• Pulled in VGA vtotal + 2 fix from DOSBox SVN
• Pulled in EGA display mode fixes from DOSBox SVN to fix
  EGA graphics emulation.
• Fixed INT 10h AH=1Ch (save/restore VGA state) to handle
  VGA attribute controller properly so that the display is
  not left blank.
• PC-98 GDC emulation fixed to handle START DISPLAY properly
  by un-blanking the display (fixes "Ellena")
• Fixed possible format string vulnerabilities (gnustomp)
• Added menu options to enable/disable EGC and GRCG
  emulation (yksoft1)
• Added options to enable/disable EGC and GRCG emulation
  (to emulate older hardware).
• Added PC-98 BIOS function to read 8x16 character bitmaps,
  which fixes "Power Dolls 2"
• BIOS now reports 16-color and EGC graphics. Some games
  that check the BIOS for capabilities may now begin to
  use 16-color graphics and EGC functions.
• Added PC-98 INT 18h function to read character font.
  This also resolves garbled text in TH01.
• PC-98 GDC emulation now uses cursor specification
  (line per character row) to determine whether graphics
  are doubled vertically or not. Several PC-98 games
  switch between 200-line (doubled) and 400-line graphics
  by programming the GDC directly, rather than through
  the BIOS.
• Added various video-related BIOS variables to the data
  in PC-98 mode.
• GDC RESET/SYNC debug text updated to indicate which GDC
  is undergoing the RESET/SYNC.
• Debugger "LOG" command (CPU execution logging) fixed to
  automatically stop logging when the BIOS begins the
  POST routine after system reset. The user who invoked
  "LOG" probably cares more about what happened up to the
  game crash, fault and reset rather than normal BIOS startup.
• BIOS now properly unmasks the PC-98 cascade IRQ, which
  allows IRQ 8-15 to function, including the mouse (IRQ13)
• Debugger interface now indicates whether 80386 paging is
  enabled or not at any time.
• Help text updates to reflect DOSBox-X changes (Shane32)
• BIOS INT 13h emulation updated to support up to 4 hard
  drives (Shane32)
• IMGMOUNT and BOOT code cleanup (Shane32)
• IMGMOUNT RAM drive support: Additional fixes and geometry
  work done, and some hangs resolved (Shane32)
• CPU emulation fixed to allow setting a breakpoint on
  ANY interrupt of a specific number, not just software
  interrupts. It is now possible to use BPINT to break
  upon hardware (IRQ) interrupts.
• DOS kernel fixed to drop to the debugger if the MCB
  (memory control block) chain is corrupted, so that
  the corrupted state can be examined. When the debugger
  continues execution, a full restart of the DOS kernel
  is run. If DOSBox-X was compiled without the debugger,
  then the normal E_Exit() path is still taken.
• Added debugger command to show, and modify, the state
  of the PIC (interrupt controller).
• Added debugger command to view or change the A20 gate.
• Added debugger command to view the state of EMS, memory
  handles, allocation, and EMS page frame mapping.
• Added debugger command to view the state of XMS, memory
  handles, and allocation.
• Added debugger command to view the layout of the ROM
  BIOS region (0xF0000-0xFFFFF) chosen by emulation.
• DOS kernel now logs kernel allocations, which can be
  seen in the debugger using the "DOS KERN" command.
• Added "RUN" command as an alternative to hitting F5.
• Added "RUNWATCH" to the debugger, so that watching the
  system run in the debugger is possible.
• Debugger data window can now be used to view memory in
  segmented, virtual (through paging), and physical (bus
  address) modes.
• Debugger window data and code view windows now indicate
  regions of memory that are beyond the end of the segment.
• Debugger window data and code view windows now indicate
  regions of memory that are paged out (will cause a page
  fault if accessed)
• PC-98 A20 gate I/O port F6h fixed to work properly as an
  enable or disable, rather than just an enable. The PC-98
  version of HIMEM.SYS no longer complains about not being
  able to control the A20 gate.
• IMGMOUNT RAM drive support: Ramdrive bug fixes and changed
  drive limits from ATA limits to BIOS/MBR (Shane32)
• INT 21h fixed to use BIOS INT 1Ch to read date and time in
  PC-98 mode. Arrowgun now runs properly.
• Fixed EMS emulation not to claim XMS memory (and zero BIOS
  extended memory size) if EMS emulation is in EMS board mode
  (and therefore not allocating extended memory through HIMEM.SYS).
• PC-98 INT 1Fh extended memory copy implemented. DOS games in
  PC-98 mode can now use this API to access extended memory.
• Fixed HIMEM.SYS emulation in PC-98 mode to zero BIOS extended
  memory values when claiming extended memory.
• PC-98 mode now sets BIOS data area values correctly regarding
  conventional and extended memory.
• Added rudimentary emulation of non-volatile RAM at the
  trailing edge of text RAM (A3FE0-A3FFF).
• PC-98 mode now adds additional BIOS data values at boot time
  so that guest OSes like PC-98 MS-DOS can see the floppy drive,
  see keyboard input, and determine the boot drive properly.
  It is now possible to boot MS-DOS in PC-98 mode.
• Added rudimentary PC-98 INT 1Bh BIOS interrupt, at least for
  floppy disk emulation.
• Cleanup and formatting enhancements to IMGMOUNT ramdisk (Shane32)
• DOS CON emulation in PC-98 mode now emulates two additional
  ANSI escapes to clear the screen that are specific to NEC's
  MS-DOS implementation, which fixes text layer problems with...

DOSBox-X release 0.82.4 2018-03-16 21:57

• BIOS now reports 16-color and EGC graphics. Some games
  that check the BIOS for capabilities may now begin to
  use 16-color graphics and EGC functions.
• Added PC-98 INT 18h function to read character font.
  This also resolves garbled text in TH01.
• PC-98 GDC emulation now uses cursor specification
  (line per character row) to determine whether graphics
  are doubled vertically or not. Several PC-98 games
  switch between 200-line (doubled) and 400-line graphics
  by programming the GDC directly, rather than through
  the BIOS.
• Added various video-related BIOS variables to the data
  in PC-98 mode.
• GDC RESET/SYNC debug text updated to indicate which GDC
  is undergoing the RESET/SYNC.
• Debugger "LOG" command (CPU execution logging) fixed to
  automatically stop logging when the BIOS begins the
  POST routine after system reset. The user who invoked
  "LOG" probably cares more about what happened up to the
  game crash, fault and reset rather than normal BIOS startup.
• BIOS now properly unmasks the PC-98 cascade IRQ, which
  allows IRQ 8-15 to function, including the mouse (IRQ13)
• Debugger interface now indicates whether 80386 paging is
  enabled or not at any time.
• Help text updates to reflect DOSBox-X changes (Shane32)
• BIOS INT 13h emulation updated to support up to 4 hard
  drives (Shane32)
• IMGMOUNT and BOOT code cleanup (Shane32)
• IMGMOUNT RAM drive support: Additional fixes and geometry
  work done, and some hangs resolved (Shane32)
• CPU emulation fixed to allow setting a breakpoint on
  ANY interrupt of a specific number, not just software
  interrupts. It is now possible to use BPINT to break
  upon hardware (IRQ) interrupts.
• DOS kernel fixed to drop to the debugger if the MCB
  (memory control block) chain is corrupted, so that
  the corrupted state can be examined. When the debugger
  continues execution, a full restart of the DOS kernel
  is run. If DOSBox-X was compiled without the debugger,
  then the normal E_Exit() path is still taken.
• Added debugger command to show, and modify, the state
  of the PIC (interrupt controller).
• Added debugger command to view or change the A20 gate.
• Added debugger command to view the state of EMS, memory
  handles, allocation, and EMS page frame mapping.
• Added debugger command to view the state of XMS, memory
  handles, and allocation.
• Added debugger command to view the layout of the ROM
  BIOS region (0xF0000-0xFFFFF) chosen by emulation.
• DOS kernel now logs kernel allocations, which can be
  seen in the debugger using the "DOS KERN" command.
• Added "RUN" command as an alternative to hitting F5.
• Added "RUNWATCH" to the debugger, so that watching the
  system run in the debugger is possible.
• Debugger data window can now be used to view memory in
  segmented, virtual (through paging), and physical (bus
  address) modes.
• Debugger window data and code view windows now indicate
  regions of memory that are beyond the end of the segment.
• Debugger window data and code view windows now indicate
  regions of memory that are paged out (will cause a page
  fault if accessed)
• PC-98 A20 gate I/O port F6h fixed to work properly as an
  enable or disable, rather than just an enable. The PC-98
  version of HIMEM.SYS no longer complains about not being
  able to control the A20 gate.
• IMGMOUNT RAM drive support: Ramdrive bug fixes and changed
  drive limits from ATA limits to BIOS/MBR (Shane32)
• INT 21h fixed to use BIOS INT 1Ch to read date and time in
  PC-98 mode. Arrowgun now runs properly.
• Fixed EMS emulation not to claim XMS memory (and zero BIOS
  extended memory size) if EMS emulation is in EMS board mode
  (and therefore not allocating extended memory through HIMEM.SYS).
• PC-98 INT 1Fh extended memory copy implemented. DOS games in
  PC-98 mode can now use this API to access extended memory.
• Fixed HIMEM.SYS emulation in PC-98 mode to zero BIOS extended
  memory values when claiming extended memory.
• PC-98 mode now sets BIOS data area values correctly regarding
  conventional and extended memory.
• Added rudimentary emulation of non-volatile RAM at the
  trailing edge of text RAM (A3FE0-A3FFF).
• PC-98 mode now adds additional BIOS data values at boot time
  so that guest OSes like PC-98 MS-DOS can see the floppy drive,
  see keyboard input, and determine the boot drive properly.
  It is now possible to boot MS-DOS in PC-98 mode.
• Added rudimentary PC-98 INT 1Bh BIOS interrupt, at least for
  floppy disk emulation.
• Cleanup and formatting enhancements to IMGMOUNT ramdisk (Shane32)
• DOS CON emulation in PC-98 mode now emulates two additional
  ANSI escapes to clear the screen that are specific to NEC's
  MS-DOS implementation, which fixes text layer problems with
  Rusty.
• PC-98 GDC dip switch 2-8 emulation fixed. It was backwards.
  This may break existing dosbox.conf configurations, apologies
  in advance.
• Added -xms option to LOADFIX command. When given, the command
  consumes extended memory instead of conventional memory.
• HIMEM.SYS emulation fixed to behave more like Microsoft's
  HIMEM.SYS implementation regarding global & local A20 gate
  control.
• Mac OS X builds fixed to work from the user's home directory
  if run from the Finder, instead of trying to operate at the
  root of the filesystem as directed by the Finder.
• Mac OS X builds now put the FREECG98.BMP file inside of the
  .app bundle, and fall back to it if not found in the current
  directory.
• RPM builds now install FREECG98.BMP in /usr/share/dosbox-x
  and refer to it if not in your local directory, in order to
  better provide PC-98 emulation.
• PC-98 BOOT command: Loading addresses and CPU register layout
  updated to match actual hardware behavior, in which the boot
  sector is loaded at just under 128KB.
• Build updates to support compiling for Windows with MinGW.
• BOOT now accepts a --debug switch that causes DOSBox-X to break into
  the debugger when the boot sector begins to execute.
• BOOT now accepts a --force switch to override the PC-98 lockout,
  if the user wants to better understand why I locked it out in PC-98 mode.
• PC-98 support now supports reading font from FONT.ROM, if available.
• Code, data, and output now respond to arrow, page up/down and
  home/end keys as a user would normally expect.
• Arrow and page up/down keyboard input now goes to active window
  instead of mapping directly to any specific window.
• Debugger interface now has the concept of an "active" window, and
  the title bar of each window hilights if it is active.
• Debugger interface now hides the "variables" window by default.
• Fixed window "titles" in debugger interface to fill the terminal
  line they're on and use ncurses horizontal line character which
  on modern systems looks better than hyphens.
• Removed one line padding around data window in debugger interface.
• Debugger interface redesigned to permit more flexible layout
• Debugger interface no longer crashes when terminal window is sized
  down too small (when there is no room for the output window)
• EMM386 (ems) emulation fixed to always turn on the A20 gate when
  the DOS application requests to map pages into the EMS page frame.
  This fixes crashes with Creative's Sound Blaster 16 installer when
  run with the A20 gate turned off.

DOSBox-X release 0.82.4 2018-03-08 12:15

• Improvements to build process
• Source tree no longer provides configure script, you'll need to use autogen.sh to build
• Linux RPM packages now include FREECG98.BMP, changelog, and reference conf in /usr/share/dosbox-x. If FREECG98.BMP is not available in the current directory, it will look for it in /usr/share/dosbox-x.
• Mac OS X builds now include FREECG98.BMP in the app bundle, and will use that if one is not provided
• Mac OS X builds will now default to using your home directory as the current working directory if run from the Finder

DOSBox-X release 0.82.4 2018-03-06 19:20

New MinGW-based builds are available for Windows XP systems and lower end CPUs.

• BOOT now accepts a --debug switch that causes DOSBox-X to break into
  the debugger when the boot sector begins to execute.
• BOOT now accepts a --force switch to override the PC-98 lockout,
  if the user wants to better understand why I locked it out in PC-98 mode.
• PC-98 support now supports reading font from FONT.ROM, if available.
• Code, data, and output now respond to arrow, page up/down and
  home/end keys as a user would normally expect.
• Arrow and page up/down keyboard input now goes to active window
  instead of mapping directly to any specific window.
• Debugger interface now has the concept of an "active" window, and
  the title bar of each window hilights if it is active.
• Debugger interface now hides the "variables" window by default.
• Fixed window "titles" in debugger interface to fill the terminal
  line they're on and use ncurses horizontal line character which
  on modern systems looks better than hyphens.
• Removed one line padding around data window in debugger interface.
• Debugger interface redesigned to permit more flexible layout
• Debugger interface no longer crashes when terminal window is sized
  down too small (when there is no room for the output window)
• EMM386 (ems) emulation fixed to always turn on the A20 gate when
  the DOS application requests to map pages into the EMS page frame.
  This fixes crashes with Creative's Sound Blaster 16 installer when
  run with the A20 gate turned off.

DOSBox-X release 0.82.4

NOTICE: This is the last official release to maintain both async and non-async Windows builds. Windows releases from this point on will contain the async code only.

0.82.4 (02/28/2018)

• Updated ramdisk formatting code to better match FAT12/FAT16
  specifications and limits (Shane32)
• Menu items related to Gravis Ultrasound, Glide emulation, Innova SID,
  and other IBM PC-specific options are now grayed out in PC-98 mode.
• Updated Windows menus to gray out CPU core and type options that
  are invalid. Selecting a prefetch CPU type while core dynamic is
  no longer possible, and selecting dynamic core while using a
  prefetch cpu type is no longer possible.
• CPU type submenu in Windows updated to reflect all types supported
  by DOSBox-X including 8086 and 286 cores.
• Fixed E_Exit() crash on Windows in PDCurses endwin() that only
  happens if you had never brought up the debugger console window.
• Minor oddities with OPNA stereo panning resolved.
• Sound Blaster, Adlib, and PC-98 FM emulation now reset state
  correctly when the reset signal is given to avoid stuck notes.
• Fixed BIOS logo in PC-98 mode to properly reset the graphics mode
  so that the logo is visible.
• Added Windows menu items to control PC-98 GDC speed, 4-partition enable,
  200-line "scanline" effect enable, and PIT timer clock control.
• Added "Restart DOS" command to the Windows menu, with code to
  allow it only if at the initial DOS shell.
• Added "multi-track WAV" command to the Windows menu, under Capture
• Added "reset system" command to the Windows menu
• "Restart" menu command updated to clarify that it restarts DOSBox-X entirely.
• OpenGL HQ output removed.
• Commands to force driver (DirectX or WINDIB) removed.
• Default disk I/O limit raised to more reasonable speeds.
• FM code borrowed from Neko Project II now compiles on Mac OS X
• IMGMOUNT now supports mounting a RAM drive (using -t ram) (Shane32)
• Direct3D fullscreen aspect ratio fixes, especially for
  monitors with a 5:4 aspect ratio (such as 1280x1024) (Shane32)
• "Show menu" in Windows builds system menu is now a toggle
  to show/hide the menu bar (Shane32)
• Fixed broken color palette with CGA composite and EGA
  machine emulation. Composite CGA and machine=ega displays
  properly again.
• According to documentation, IBM PC and PC-98 use different
  initial PC speaker frequencies. Update the code to match.
• 8254 I/O port alias at 3FD9h-3FDFh added, which is needed
  for several PC-98 games that program the PC speaker
  frequency through those ports instead of through 71h-77h
• New Intel 8255 emulation. PC-98 system 8255 emulation
  now uses this emulation, along with PC speaker emulation.
• Fixed XMS memory copy functions to enable the A20
  gate so extended memory copies work correctly whether
  or not the DOS application in question made the call
  with A20 enabled. This fixes crashes and memory
  corruption while installing Windows 3.1 using SETUP.EXE.
• "CLS" now sends the proper ANSI escapes to clear the
  console in PC-98 mode.
• BIOS logo in PC-98 fixed to clear graphics RAM and
  set graphics back to 8-color digital mode when booting
  to DOS. This should fix palette errors and color issues
  with older PC-98/PC-88 games that use the 8-color
  graphics modes.
• Added PC-98 INT 1Ch timer interval BIOS function,
  and timer countdown routine in IRQ 0.
• Windows builds now incorporate pdcurses and enable
  the debugger interface (bulletshot60)
• DOSBox-X now tracks the systemwide keyboard layout
  on Windows, and acts on user changes to the keyboard
  and language in the system.
• Removed hack code in SDL 1.x that sets DOSBox-X's
  keyboard layout to the US layout even if the host
  uses anything else.
• Fix CPU cycles count increment not to nag you to use
  core=dynamic if a) dynamic core is not available or
  b) you're already using dynamic core.
• Added dynamic core back, it seems to be very stable
  again.
• PC-98 FM board now allows changing the base I/O port
  and IRQ (interrupt) line used by the card.
• PC-98 mode now supports joystick emulation. Joystick
  input is mapped through the DOSBox mapper to the
  PC-98 FM board where DOS games expect to see it.
• Added dosbox.conf option to select which PC-98 FM
  board to emulate.
• Fixed PC-98 FM code to enable the ADPCM and Rhythm
  FM channels.
• Re-ported Neko Project II FM board emulation, this
  time keeping the code intact and keeping the separate
  board emulations intact for PC-98 mode.
• VGA palette errors with Crystal Dream II fixed.
• 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.
• Prefetch core debug code now disabled at compile
  time. Seems to be stable so far.
• Prefetch core now emulates partial load of the
  prefetch buffer on miss, and completing the buffer
  fill on hit, to better emulate (probable) 80486
  behavior.
• 486_prefetch is now a valid cputype setting, despite
  the setting having existed for years in the source
  code. Prior to this fix, 486_prefetch was ignored.

DOSBox-X release 0.82.3 2018-02-26 13:17

• IMGMOUNT now supports mounting a RAM drive (using -t ram) (Shane32)
• Direct3D fullscreen aspect ratio fixes, especially for
  monitors with a 5:4 aspect ratio (such as 1280x1024) (Shane32)
• "Show menu" in Windows builds system menu is now a toggle
  to show/hide the menu bar (Shane32)
• Fixed broken color palette with CGA composite and EGA
  machine emulation. Composite CGA and machine=ega displays
  properly again.
• According to documentation, IBM PC and PC-98 use different
  initial PC speaker frequencies. Update the code to match.
• 8254 I/O port alias at 3FD9h-3FDFh added, which is needed
  for several PC-98 games that program the PC speaker
  frequency through those ports instead of through 71h-77h
• New Intel 8255 emulation. PC-98 system 8255 emulation
  now uses this emulation, along with PC speaker emulation.
• Fixed XMS memory copy functions to enable the A20
  gate so extended memory copies work correctly whether
  or not the DOS application in question made the call
  with A20 enabled. This fixes crashes and memory
  corruption while installing Windows 3.1 using SETUP.EXE.
• "CLS" now sends the proper ANSI escapes to clear the
  console in PC-98 mode.
• BIOS logo in PC-98 fixed to clear graphics RAM and
  set graphics back to 8-color digital mode when booting
  to DOS. This should fix palette errors and color issues
  with older PC-98/PC-88 games that use the 8-color
  graphics modes.
• Added PC-98 INT 1Ch timer interval BIOS function,
  and timer countdown routine in IRQ 0.
• Windows builds now incorporate pdcurses and enable
  the debugger interface (bulletshot60)
• DOSBox-X now tracks the systemwide keyboard layout
  on Windows, and acts on user changes to the keyboard
  and language in the system.
• Removed hack code in SDL 1.x that sets DOSBox-X's
  keyboard layout to the US layout even if the host
  uses anything else.
• Fix CPU cycles count increment not to nag you to use
  core=dynamic if a) dynamic core is not available or
  b) you're already using dynamic core.
• Added dynamic core back, it seems to be very stable
  again.

DOSBox-X release 0.82.3 2018-02-21 08:45

• Windows builds now incorporate pdcurses and enable
  the debugger interface (bulletshot60)
• DOSBox-X now tracks the systemwide keyboard layout
  on Windows, and acts on user changes to the keyboard
  and language in the system.
• Removed hack code in SDL 1.x that sets DOSBox-X's
  keyboard layout to the US layout even if the host
  uses anything else.

DOSBox-X release 0.82.3 2018-02-19 23:11

• Fix CPU cycles count increment not to nag you to use
  core=dynamic if a) dynamic core is not available or
  b) you're already using dynamic core.
• Added dynamic core back, it seems to be very stable
  again.
• PC-98 FM board now allows changing the base I/O port
  and IRQ (interrupt) line used by the card.
• PC-98 mode now supports joystick emulation. Joystick
  input is mapped through the DOSBox mapper to the
  PC-98 FM board where DOS games expect to see it.
• Added dosbox.conf option to select which PC-98 FM
  board to emulate.
• Fixed PC-98 FM code to enable the ADPCM and Rhythm
  FM channels.
• Re-ported Neko Project II FM board emulation, this
  time keeping the code intact and keeping the separate
  board emulations intact for PC-98 mode.
• VGA palette errors with Crystal Dream II fixed.
• PC-98 FM synthesis fixed not to initialize itself
  again when rebooting, which fixes a problem with
  garbled FM synthesis after rebooting.