DOSBox-X 2024.03.01 2024-03-01 14:58

• If an empty CD-ROM drive is attached to IDE emulation, return "Medium Not
  Present" instead of a read error, when asked to read. (joncampbell123).
• Add "empty drive" CD-ROM image type "IMGMOUNT e: empty -t iso" as a way
  to emulate an empty CD-ROM drive with no disc in the drive. (joncampbell123).
• Add "empty drive" floppy image type "IMGMOUNT 0 empty -t floppy -fs none"
  as a way to emulate a floppy drive with no disk in the drive. (joncampbell123).
• Video debug overlay: Fix mouse integration misalignment when the video
  debug overlay is enabled while Windows is running (joncampbell123).
• Video debug overlay: Fix segfault when enabled with 15/16bpp SVGA modes.
  (joncampbell123).
• Video debug overlay: Fix bug where video debug failed to appear in SVGA
  15/16/24/32bpp display modes because of a design where the VGA drawing
  code points directly at video RAM except when drawing the hardware cursor.
  One symptom was that the video debug info on the side failed to appear at
  all, unless running in Windows and only within the vertical range of the
  mouse cursor. (joncampbell123).
• Video debug overlay: Do not bother showing the Attribute Controller palette
  in 15/16/24/32bpp SVGA modes because it doesn't matter there and is not
  involved with how anything is displayed. (joncampbell123).
• Video debug overlay: Fix debug info text to appear for 15/16/24/32bpp SVGA
  modes. (joncampbell123).
• BOOT --bios no longer triggers a system reset VM event, but instead just
  jumps to the new BIOS image after DOS kernel shutdown. This is needed for
  hardware and resources to stay as they were when running the BIOS i.e.
  keeping any IDE devices configured within the DOS kernel intact so that the
  BIOS can find and use them. Prior to this change, all hardware was fully
  reset and unmapped prior to running the BIOS which made IDE emulation
  unusable with BIOS images. (joncampbell123).
• BOOT --bios no longer immediately loads the new BIOS into memory, but instead
  loads and stores the image to a temporary buffer. The ROM image does not
  actually get mapped in until the DOS kernel and everything else has had a
  chance to shut down fully. (joncampbell123).
• Fix BOOT --bios not to try to load PC-98 ITF firmware unless actually running
  in PC-98 mode (joncampbell123).
• Write PC-98 keyboard translation table (non-shifted) in ROM BIOS and set the
  keyboard translation table pointer in the BIOS data area for "Nut Berry".
  This Nut Berry game also assumes lookup and translation tables exist at
  specific locations in the ROM BIOS, so put those tables there. The shift
  state table in BIOS has also been added, though at the moment, the tables
  are incomplete. (joncampbell123).
• MegaZeux from the MS-DOS days had a 256-color tweakmode that worked on some
  popular SVGA chipsets of it's time though on others it does nothing but halve
  the display resolution of text mode. The basic idea is that it makes the VGA
  card latch two 4-bit outputs of the VGA text mode into one 8-bit value, thus,
  256 colors possible. Add support for this. However I am not sure whether this
  tweakmode is supported by S3 chipsets, so it is OFF by default and you will
  need to add "enable supermegazeux tweakmode=true" to the [video] section of
  your dosbox.conf to enable it. (joncampbell123).
• Undo the "no partition offset" change. DOOM II for PC-9821 requires it to work
  else the page flipping fails and sprites and rendering flickers as you play.
  (joncampbell123).
• Allow text layer to appear in PC-98 256-color mode. Even though I was unable
  to enable it on real hardware, "Shamat, The Holy Circlet" requires having
  the text layer visible on top of 640x400 256-color mode for the introductory
  scrolling text to appear on screen. So for now, just allow it. (joncampbell123).
• The reason some PC-9821 games have been giving bad PITCH values (double the
  correct value) to the GDC in 256-color mode has been determined. They read
  port 9A0h to determine if the GDC is running at 5MHz or not. That port 9A0h
  index was not implemented and therefore gave the game the impression it was
  running at 5MHz when it was not, therefore the doubled PITCH value. This fix
  corrects the squeezed 256-color mode and allows it to appear properly.
  (joncampbell123).
• IMGMOUNT: If the file extension is HDI, assume a hard disk image even if the
  image file is small enough to qualify as a floppy disk image. There is an
  HDI image of PC-98 game "D.O. Doki Doki Disk 8" that is 2.2MB, small enough
  to be mistaken as a 2.88MB IBM PC floppy disk and therefore fail to mount
  as an HDI image, this change fixes it. (joncampbell123, maron2000).
• Emulate PEGC PC-98 linear framebuffer at both 0xF00000-0xF7FFFF (at 15MB
  memory mark) but also make it appear at top of memory below BIOS (normally
  at 0xFFF00000-0xFFF7FFFF). Some 32-bit PC-9821 CD-ROM MS-DOS games assume
  the top of memory alias and will fail to show anything on screen without
  it (unless, alternatively, the memalias setting is set to emulate 24 address
  lines like a 386SX). Now to figure out why these same games are programming
  a GDC PITCH value that's double what it should be... (joncampbell123).
• PC-98 GDC scan offset no longer pays attention to scan offset of data
  partition in 256-color mode. Required to help fix broken 256-color graphics
  for some PC-98 CD-ROM games. (joncampbell123).
• Refuse to enable ISA 15MB-16MB memory hole if memalias is set to 24 bits or
  less. Not only is it redundant to do that but it also causes the BIOS to
  immediately crash on startup. (joncampbell123).
• IDE ATAPI CD-ROM emulation: In PC-98 mode when emulating a NEC CD-ROM drive,
  also limit sector reads to one CD-ROM sector per DRQ because the MS-DOS driver
  assumes that behavior. The driver will stall and error out if it requests a
  multi-sector read and the drive does NOT limit transfers to one sector at a
  time per IDE data transfer. This is in line with my experience writing the
  DOSLIB IDE testing program and laptops from the 1990s with IDE ATAPI CD-ROM
  drives, so it's understandable. (joncampbell123).
• The reason the CD-ROM driver in PC-98 game HDI images refused to talk to our
  IDE CD-ROM emulation is... (drumroll) we didn't report ourself as an NEC
  CD-ROM drive when given the MMC INQUIRY command. Yes, really. The OAK CD-ROM
  driver in these HDI images really does care whether or the drive is an NEC
  brand drive. What a stupid reason not to talk to a CD-ROM drive. Add code to
  default to "NEC" "CD-ROM DRIVE" as the INQUIRY result if running in PC-98 mode.
  (joncampbell123).
• Add basic rudimentary support for CloneCD (*.ccd *.img) images. It might not
  work with more complex arrangements but it is enough for most CD-ROM PC-98
  games so far. (joncampbell123).
• libpng supports the pHYs PNG chunk which describes the pixel aspect ratio of
  the PNG image. libpng 1.6 has it, use it. Programs that support the information
  like FFMPEG will then display the PNG image with the correct aspect ratio.
  (joncampbell123). [https://github.com//issues/4754]
• PC-98 mode: There is a 302KHz timer behind I/O ports 5Ch/5Eh that some MS-DOS
  drivers depend on for timing, particularly a popular IDE CD-ROM device driver
  in many PC-98 game HDI images. This change allows the driver to time out after
  about 5-10 seconds instead of an infinite hang. (joncampbell123)
• Fix INT 10h to keep hardware CRTC I/O port synchronized with BIOS DATA area
  copy so that other parts of INT 10h called by SetVideoMode do not accidentally
  talk to the wrong I/O ports. This fixes corrupted INT 10 Mode F display
  (640x350 monochrome graphics mode). (joncampbell123).
• Add DOS Int21 0x5D 0x00 - remote server call
  Inspired by FeeDOS inthndlr.c
  With this change it is possible use a plain dosbox-x to install and run
  Windows for Workgroups V3.11 as an IPX server on the pcap ne2000 interface
  offering a host directory for read and persistent write access to an
  MSDOS machine running a WfW 3.11 IPX network client.
  Please don't forget mounting with -nocachedir
  (Issue #4162)(Yogi-baer)
• Fix missing keystroke SDLK_LESS on DE keyboard on Raspbian OS (Yogi-baer)
• Fix crash when loading a language file without existing menu item "ttf_extcharset" (Yogi-baer)
• Change ISA memory hole 512kb option from boolean to true/false/auto. (joncampbell123)
• Add ISA memory hole 15mb option, make it true/false/auto.
  Auto means off for IBM compatible mode and on for PC-9821 compatible mode.
  This should allow some DOS games that depend on the linear framebuffer
  to work properly even if memsize=16 or higher. (joncampbell123)
• MIDI: set minimum sysex delay when enabled (mistydemeo)
• International support in LABEL, COPY, DEL builtin commands (maxpat)
• Fix palette setting bugs due to SETCOLOR fix in 2023.10.06 release. (maron2000)
  Graphical glitches in Ultima VI(#4507), Chessmaster 3000(#4510), Wizardry VII(#4534)
  Crash Sid Meyer's Civilization I (#4511)
  TTF color settings regarding 'colors' option (#4579, #3318) and some more
• Fix crash when mounting floppy/ISO images with no extension (maron2000)
• Fix Intel macOS CI builds crashed on startup due to missing dylibs
  (Issue #4438)(maron2000)
• Fix TTF mode didn't switch to graphics mode on certain types of machines
  such as tandy/pcjr.(Issue #4559)(maron2000)
• Fix crash on switching to fullscreen when output=opengl (Intel macOS) (maron2000)
• Update DXCapture shell command to support /O for OPL capture (AranVin...

DOSBox-X 2023.10.06 2023-10-06 23:24

2023.10.06

• Add "VRD" debugger command to force redraw of the VGA screen.
• Add VGA debug set commands to force a video start address and another
  to clear all debug settings.
• Add "PITSYNC" option to VFRCRATE command. "VFRCRATE PITSYNC ON"
  directs the system timer interrupt to synchronize tick rate with
  vertical refresh rate of VGA emulation if the game or demo set
  the timer tick rate to a value close enough to vertical refresh.
  This is intended for games or demos that use the system timer for
  a vsync interrupt.
• IMGMAKE: Fix bug where if -bat was specified, the generated .bat
  file would attempt to mount the .bat file, not the disk image.
• IMGMAKE: If -nofs and -bat was specified, the generated .bat file
  will refer to "IMGMAKE 2" instead of "IMGMAKE C"
• DOS FAT driver: When the guest sends in a new BIOS Parameter Block,
  recalculate the disk locations and FAT type properly instead of
  assuming that FORMAT.COM is using the same format already present.
• DOS FAT driver: If the partition is unformatted and looks as if
  freshly written by FDISK, then instead of failing to mount, mount
  the partition instead as an unformatted partition and fail file
  I/O until a BPB is set and the partition formatted by FORMAT.COM.
  This matches MS-DOS behavior and it makes it possible to mount an
  image, FDISK it, restart, FORMAT.COM the unformatted partition,
  and end up with a working drive letter (just like MS-DOS). So far
  verified against MS-DOS 6.22 and Windows 98 versions of FDISK,
  FORMAT, SYS, and SCANDISK.
• DOS FAT driver: Add options -o sectoff and -o sectlen to make it
  possible to manually specify the start and length of a partition.
  Future code will use this internally as well.
• IMGMOUNT: Allow *: as a drive letter to mean automatically pick a
  drive letter.
• Fix debugger to use toupper(), but only for ASCII range ncurses
  keycodes.
• Timer PIT: If the guest writes the counter value while the counter
  gate is off, make sure the counter read back is the same value
  written regardless of gate status. Prior code returned the stale
  latched value of the counter as it was prior to shutting off the
  gate and writing the counter, causing timing issues.
• Fix restoring minimized window on TTF output (Issue #4248) (maron2000)
• Fix macos crash on launch when output=surface or auto (SDL2) (maron2000)
• Update in-tree SDL2 library to ver 2.28.2 (maron2000)
• Updated build tool for MinGW lowend builds required for the updated SDL2
  library. As a result, MinGW lowend builds are now able to enable debugger
  features. (maron2000)
• Debugger RUN and RUNWATCH commands were broken, fix. Make sure debugger
  shortcut triggers execution to stop whether in RUN or RUNWATCH mode.
• Fix SETCOLORS command didn't change color when output=ttf.(Issue #4503)
  Also fixed the values reported were wrong. (maron2000)
• BIOS CMOS date/time functions will now idle the CPU 4 times after reading
  or setting the clock to allow interrupts, CPU time, and RTC clock ticks
  to proceed normally. This fixes "Pizza Tycoon" and allows it to continue
  past the initial logo. (joncampbell123)
• Fix segfault when mounting hard disk images with no file extension
  (joncampbell123).

DOSBox-X 2023.09.01 2023-09-01 17:00

2023.09.01

• Disable by default message confirmation after snapshot and AVI video
  capture, but leave the option there for those who want to enable it (joncampbell123).
• Remove "LOG: Logging output has been disabled." output when -nolog
  is specified on the command line (joncampbell123).
• Fix stuck Ins key problems by fixing a typo in src/ints/bios_keyboard.cpp.
  The code is supposed to clear the "Ins key down" flag, but instead cleared
  all bits EXCEPT "Ins key down" (joncampbell123).
• NE2000 macaddr default is now "random", which instructs the NE2000
  hardware at startup to pick a random MAC address. (joncampbell123).
• IPX: If NE2000 and IPX are enabled, and an IPX tunneling connection is
  active, and the user boots a guest OS, switch on a mode where all IPX
  packets going to and coming from the guest are re-routed through the
  IPX tunnel instead of to the NE2000 ethernet backend. This feature
  makes it possible to play IPX-based games in a guest OS like MS-DOS
  and Windows 95. (joncampbell123).
• IPX: Add extension to server to allow clients to register their own
  MAC address instead of using the default MAC address given by their
  IP address and port number. The extension is designed so that if DOSBox-X
  is a client to another DOSBox fork's IPX tunneling server, it will
  be ignored and DOSBox-X will get the usual MAC address instead. This
  extension is required for guest OSes to be able to use the IPX protocol
  through the NE2000 card given upcoming code changes as they normally
  use the network card MAC address when picking an IPX address because
  the IPX interface is not available once booted into a guest OS. (joncampbell123).
• IPX client: If both IPX and NE2000 emulation are enabled, IPX emulation
  will use the NE2000 card's MAC address instead. It will use the IPX
  server DOSBox-X extension to try. If it doesn't work, then the normal
  MAC address assignment is accepted without complaint. (joncampbell123).
• NE2000: Add "nothing" backend. It receives nothing and send packets go
  nowhere. If no other backend is available, this backend is a fallback
  so that at least the NE2000 emulation can work. The other purpose of
  a nothing callback is to give NE2000 something to talk to for those
  who wish to use the upcoming IPX packet redirection to link DOS and
  Windows games over the IPX client or server connection to other
  instances of DOSBox. (joncampbell123)
• Added record function to capture NE2000 network traffic to a
  pcap/Wireshark file in the capture directory. (joncampbell123)
• Fixed bug where guest VM reset causes the CMOS to stop ticking for
  exactly the amount of time it was running before reset. (joncampbell123)
• Added alarm interrupt function to RTC CMOS emulation (joncampbell123)
• Reverted DOS to using the BIOS_DATA tick count for time and the cached
  copy of date it keeps internally, rather than always calling INT 1Ah.
  It turns out that is how DOS actually behaves, which is also why it is
  possible for the DOS and CMOS RTC to diverge. Fix CMOS emulation to
  allow get/set time and to run in emulation time, not real time, though
  the clock starts from the host time. (joncampbell123)
• Fixed VHD disk image calculation of footer position and, thus, of newly
  allocated block position. (maxpat78)
• Enhanced Dynamic and Differencing VHD support #4273 (maxpat78)
• Imported IBM Music Feature Card support from DOSBox Staging. (Allofich)
• Fix IMGMAKE large size image error on MinGW builds (maron2000)
• Set usescancodes=true when non-US keyboards are detected. (Linux / MacOS
  builds) (maron2000)
• Fix day of week detection (INT 21h function 0x2Ah). (maron2000)
• Refine KEYB and CHCP command (maron2000)
• Use segment descriptor's big flag (if present) when disassembling code in
  the debugger code view (cimarronm)
• Add decoding of rdmsr/wrmsr instructions to disassembler (cimarronm)
• Fix disassembly for far jmp/call decoding (cimarronm)
• Fix memory limits on expand-down segment descriptors (cimarronm)
• Bump tinyfiledialog to ver 3.13.3 (maron2000)
• Fix mouse column limit on text mode (issue #4353) (maron2000)
• Fix Blocek launching failure (issue #4385) (maron2000)
• Bump in-tree FreeType library to ver 2.13.1 (maron2000)
• Enable debugger function for MinGW builds (maron2000)

DOSBox-X 2023.05.01 2023-05-01 10:30

2023.05.01

• IMGMAKE will choose LBA partition types for 2GB or larger disk
  images, but the user can also use -chs and -lba options to override
  that choice. The CHS or LBA partition types do matter because it
  affects which version of INT 13h is used by Windows 98/ME to boot up
  and, if drive C: is in compatibility mode, at all times. (joncampbell123)
• PC-98 256-color mode will also trigger the auto mode of "render on
  demand" for performance reasons because per-scanline raster effects
  are very unlikely in that case, as will MDA and Hercules machine
  types. (joncampbell123)
• When the DOS IDLE API is enabled (by default), limit STI+HLT to
  occur on INT 28h only once after any call to read the CON device
  or call to BIOS INT 16h to read the keyboard. This fixes stalls
  and sluggish input problems with programs that like to call INT 28h
  often like the Pacific C compiler PPD IDE interface. (joncampbell123).
• Hercules InColor machine type: Fixed attribute and RAMFONT handling
  of 48K RAMFONT mode and added planar text rendering. (joncampbell123).
• Write BIOS data area fields for number of rows, char height, etc.
  for MCGA machine type in addition to EGA/VGA machine types because
  IBM technical references suggest it's there for MCGA as well.
  This also resolves an issue where with the MCGA machine type, INT 10h
  failed to print any text to screen whatsoever. (joncampbell123).
• Render on demand (Staging calls it "lazy rendering") now defaults
  to "auto" and allows an "auto" setting. The auto setting will
  turn it off for standard VGA modes and will turn it on for SVGA
  modes where per scanline raster effects are very unlikely to
  occur. This may provide a performance boost for DOS games in SVGA
  modes and the Windows desktop (joncampbell123).
• CGA 320x200 4-color mode is now rendered using the M_EGA render
  code for EGA/VGA machine types to better reflect real hardware.
  (joncampbell123).
• Fix bug where setting doublescan=false for anything other than
  the VGA machine type would break CGA graphics modes.
  (joncampbell123).
• Fix video debug overlay calculations of source video mode for
  CGA graphics modes. (joncampbell123).
• CGA 640x200 2-color mode and MCGA 640x480 2-color mode are no
  longer rendered as M_CGA2 for EGA/VGA machine types. The reason
  is that at the hardware level they are really just IBM standard
  tweaked versions of the EGA/VGA 16-color modes with additional
  bits for the interleave emulation and can be properly emulated
  with the M_EGA renderer. M_CGA2 is still used for the CGA and
  MCGA machine types for those modes. The DCGA DOS/V mode has been
  carefully made into it's own render mode instead of part of the
  M_CGA2 case. (joncampbell123).
• Fixed refcount -1 error and abort when multiple floppies are
  attached to a floppy drive and the "Swap floppy" mapper shortcut
  is used at least once (joncampbell123).
• Hercules palette selection now provides a "dark gray" color
  mapping to match the green, amber, or gray palette selection of
  the user (joncampbell123)
• Fix Hercules vs MDA attribute handling of "dark gray" background
  color when hardware blink is disabled. (joncampbell123)
• Added RAMFONT emulation to Hercules Plus machine type, fixed code
  to allow Hercules Plus text mode to draw farther than the first 4KB
  of RAM if RAMFONT enabled. (joncampbell123)
• DOS kernel: Fix programming mistake that allocated perhaps a bit
  too much DOS kernel memory for the "List of Lists" info block.
  Fix the sizes of the info block and other structures to make sure
  specific kernel structures are placed at fixed addresses because
  later Microsoft software for MS-DOS checks those values.
  (joncampbell123)
• Serial port: Add multiplier: setting as requested to enable
  faster than 115200 baud rates. (joncampbell123)
• Fix mistakes in CPUID emulation that threw a #UD exception for
  specific cases where EAX was not recognized by particular CPU
  types. (joncampbell123)
• Fix RTC clock emulation to correctly signal IRQ8 interrupt for
  both periodic tick and update-ended events. Prior to this fix,
  only periodic tick events were reported even if the bit was set
  to enable update-ended. (joncampbell123)
• Fix serial and AUX PS/2 mouse emulation to not send relative
  motion unless mouse captured, to make it consistent with the
  BIOS PS/2 mouse emulation (joncampbell123)
• FAT driver: Major performance boost is possible by eliminating
  unnecessary code that re-reads the entire directory when looking
  up or changing one particular directory entry. (joncampbell123).
• CMOS registers: Fix code to allow getting and setting time,
  fix year vs century registers to work properly. (joncampbell123).
• BIOS INT 1Ah: Fix functions to get and set time and date
  instead of faking on read and ignoring set. Use the CMOS
  registers. (joncampbell123).
• DOS INT 21h: Fix date and time functions to call the BIOS for
  time instead of trying to fake it only at the DOS level. This
  includes allowing INT 21h to change the date/time using the
  BIOS. (joncampbell123).
• DOS shell: Make TIME actually use INT 21h to set time instead of
  directly modifying the BIOS timer tick count in the BDA.
  (joncampbell123).
• Increased PIC event queue size, there are corner cases especially
  with Windows XP that can occasionally overrun the queue.
  (joncampbell123).
• Updated IBM PC keyboard emulation to correctly encode Pause and
  Print Screen key scan codes when shift, alt, and ctrl are held
  down. This makes it possible to type "Alt+SysRq" for programs
  that expect it, including SoftICE. (joncampbell123).
• NE2000 emulation: Looking at recent Bochs source code, ne2k.cc
  appears to have downgraded the "IMR write, reserved bit set"
  message from BX_PANIC to BX_ERROR. Update the same in DOSBox-X
  so that Windows 2000 no longer crashes the emulator with E_Exit()
  when probing the NE2000 hardware. (joncampbell123).
• INT 33h mouse services: Add "Get General Driver Information"
  function for Microsoft Word 5.5 (joncampbell123).
• INT 33h mouse services: Render cursorType == 2 (graphics cursor)
  as if text cursorType == 0 if the current mode is text mode.
  Microsoft Word 5.5 always calls functions to set text AND graphics
  cursor regardless of whether the actual mode is graphics or not.
  This fix allows the cursor to show correctly as the block cursor
  it wanted in text mode instead of a moving hardware blinking cursor.
  (joncampbell123).
• Fixed S3 XGA emulation bitmap rendering to correctly handle
  8/16/32-bit pixel transfer I/O and update comments to reflect
  the 32-bit byte aligned transfer mode of the Trio chipset.
  This fixes incorrectly drawn radio buttons and 16x16 icons
  in Windows NT 3.5, Windows NT 3.51, Windows NT 4.0, and
  Windows 2000. (joncampbell123).
• Fixed keyboard emulation so that upon the keyboard reset command
  FFh, the keyboard does the reset process and THEN sends back
  bytes 0xAA (power on/reset OK) and 0x00 (interface self-test).
  This resolves the issue where Windows NT 3.1 pauses at startup and
  does not resume booting until you press a key on the keyboard.
  This also resolves the issue where Windows NT 3.5 keyboard and
  mouse input stops working completely if you press a key on the
  keyboard. (joncampbell123).
• Add Hercules InColor emulation of MDA vs CGA attribute select,
  and make sure it obeys the blink setting (joncampbell123)
• Change Hercules/MDA text output to render 9 pixels per char
  if the char9 setting is on, to match the 9x14 character cell
  that those cards emit to the screen. The user can always turn
  it back off to get the 8x14 text they're probably accustomed
  to in other DOSBox forks. (joncampbell123)
• Render output fixed to never double pixels vertically on render
  if the machine type is emulating VGA and the Doublescan option
  is enabled, in order to help resolve SVGA text mode issues
  reported by ThomasKjoernes (joncampbell123)
• Add InColor CRTC registers and add code to emulate the planar
  bitplane operations. Microsoft Flight Simulator 3.0 renders
  correctly now. (joncampbell123)
• Update Hercules InColor code to render the same 64-color EGA
  palette as machine=ega. (joncampbell123)
• Correct machine=hercules text rendering flaw that prevented
  the bright attribute (bit 3/7) from working, making all text
  output the same normal brightness. (joncampbell123)
• Add expected data structures and signatures to VGA ROM BIOS at
  C000:0000 if machine type selects ATI emulation (joncampbell123).
• Add ATI machine types, which at this time, is just a placeholder
  for development to go in that direction over time for those
  machine types. (joncampbell123)
• Added "machine=hercules_plus" and "machine=hercules_incolor" as
  stubs to be developed on going forward to emulate the HGC+ and
  InColor cards. Note that InColor will require the MCH_HERC case
  to generate 64-color EGA-like output going forward even if the
  documented stratup state still emulates the MDA-like monochrome
  attributes. (joncampbell123)
• SDL2: Stop checking for compiler flags that make it an error to
  declare variables after statements in a function or any other
  terrible sins that would offend old C89 standard compilers.
  DOSBox-X is never going to compile for a C standard that old.
  Furthermore this check is preventing compilation on ARM-based
  Macbooks for some reason, though not Intel based Macbooks.

DOSBox-X 2023.03.31 2023-03-31 23:59

2023.03.31

• "mount -t overlay" will now print a message on the console to
  let you know if the act of mounting the overlay replaced a
  previous overlay mount. Overlay mounts cannot be stacked in
  DOSBox-X (and probably most DOSBox forks that support overlays)
  and the user should understand that. (joncampbell123).
• Remove kludges from DOS path resolution to handle drive paths
  that refer to drive @ (at sign). Note that in ASCII the at sign
  is one code below capital "A". Windows 95 FORMAT.COM due to
  another issue was asking for "@:\WINBOOT.SYS" and sometimes
  causing a segfault in DOS path resolution due to an uninitialized
  drive index. The fix for the other issue removes the need for this
  kludge. In it's place a message will be logged to your log file if
  anything attempts to access files on drive "@:" because it likely
  means a failure to determine the drive index properly. (joncampbell123).
• In addition to reporting the "boot drive" via INT 21h AX=3305h, also
  write boot drive in the "List of Lists" structure. Windows 95
  FORMAT.COM reads the boot drive from the LoL and does not do any
  error checking if that value is out of range (such as if it was
  never set and the byte value is zero). Failure to set this field
  will result in FORMAT.COM attempting to access "@:\WINBOOT.SYS"
  and "@:\IO.SYS" and failing. (joncampbell123).
• Add dosbox.conf option to set a fixed RTDSC tick rate to use at
  all times during emulation instead of the CPU cycle count
  (joncampbell123).
• Fix RDTSC to maintain a monotonic increasing count even if the
  CPU cycles count changes, and better handle timestamp writes
  through WRMSR (joncampbell123).
• FAT filesystem driver: Instead of searching from cluster 0 every
  time a new cluster is to be allocated, keep track of the search
  to help reduce slowdowns on fairly large filesystems when many
  files are copied onto it (joncampbell123)
• Page Up/Down vs Roll Down/Up was in the wrong order, switch order
  to correct it. (joncampbell123)
• Fix 'pc98 force ibm keyboard layout' was always forced to be 'true'
  for left & right bracket keys on US keyboards. (maron2000)
• Fix dynamic_nodhfpu FPU stack bugs, the same bugs that once plagued
  dynrec. dynamic_x86 never seemed to have the same problem because
  in reality the DH FPU case was normally used, to hit this bug you
  had to use core=dynamic_nodhfpu. Also fix dynamic x86 DH FPU code
  never to restore from DH case if the DH FPU code was never enabled,
  which periodically caused FPU state to dissapear. (joncampbell123).
• Add dosbox.conf option to control the MSCDEX.EXE device name when
  emulating a CD-ROM drive (joncampbell123).
• Wengier coded this nice text-only DOSBox-X logo for the TTF output.
  Fix border alignment issues and make the text logo the default and
  only option for MDA and Hercules machine types at boot.
  (joncampbell123).
• Add -print-ticks command line option, which enables code to print
  both SDL_GetTicks() and emulator time once a second to the console
  and the log file. This may help in tracking down bugs related to
  long term laptop suspend or suspension of the process in general.
  (joncampbell123).
• PC-98: Ignore INT 18h AH=0Ch (enable text layer) in 256-color mode.
  Real hardware doesn't seem to let you turn on the text layer in
  256-color mode, though I am not certain if this is a restriction
  imposed by the BIOS or by the hardware. This fixes possible cases
  where Sim City 2000 in 256-color mode reveals garbage text data at
  the bottom of the screen if it is there when it starts. This doesn't
  fix the issue where Sim City 2000 cannot set 640x480 256-color mode
  properly unless your display is already set to 31Khz hsync because that
  is evidently a bug in the game, not DOSBox-X. (joncampbell123).
• PC-98 256-color mode: Fix "Active Display Words" value set by INT 18h
  to 40, not 80, for graphics layer. This has no apparent effect on
  games but it does fix the sometimes erroneous graphics layer width
  in the video debug display. Neko Project II source code seems to
  indicate the 31KHz hsync mode is programmed that way even if 256-color
  mode. This should not break anything since the GDC doesn't let you
  read back the "SYNC" reset parameters anyway--this isn't VGA hardware,
  after all. (joncampbell123).
• IPX emulation was broken because it set up the virtual file, IRQ
  and interrupt handler way too early, which the BIOS startup would
  then overwrite with the default BIOS IRQ handler. IPX emulation
  should work now, at least multiplayer DOOM. (joncampbell123)
• Added debug menu and dosbox.conf option to show debug information
  at the bottom of the screen when enabled. This debug information
  reflects the video state at the start of active display. It can be
  used to see in real time the state of the palette, display offset,
  display stride, and other useful information. It is rendered into
  the frame on purpose so that it appears as part of the picture
  when you take a screenshot or record a video to AVI or MTS for
  later review. (joncampbell123)
• Dynamic core: Fix serious bug in dynrec dynamic core where calls
  to handle x86 FPU instructions erronously passed the entire
  FPU status word instead of passing only the FPU stack pointer.
  The result of this error was that floating point was erratic,
  buggy, and often caused memory corruption in DOSBox-X eventually
  leading to a crash. It should now be possible to properly run
  DOS games on dynrec based systems, including ARM-based M1 Macbooks,
  that use the FPU. (joncampbell123)
• Debugger: When entering debugger interface, force dynamic core
  to flush it's state so that the debugger can show the correct
  state to the user when they use the "FPU" command to see it.
  (joncampbell123).
• VGA emulation: Automatically ignore odd/even mode if "Chain 4"
  mode is enabled in the sequencer (normally enabled only for
  256-color mode). Some games accidentally set odd/even mode
  in 256-color mode and yet apparently worked just fine on real
  hardware. Without this change, such games will display distorted
  graphics. It makes logical sense "Chain 4" would take priority
  over odd/even mode. Note: If a game uses 256-color unchained mode
  AND foolishly enables odd/even mode, then the resulting distorted
  graphics are probably accurate to what would happen on real
  hardware, but then programmers would have caught their mistake
  and fixed it so that is very unlikely to occur. This helps to fix
  "Seal: Magic Eye" although some remaining visual artifacts in the
  game can only be resolved by setting machine=svga_et4000
  (joncampbell123).
• Set usescancodes=true when non-US keyboards are detected
  (Windows builds) (maron2000)
• For long double without using x86 FPU, the code still calls the
  fstcw instruction and can enable FPU exceptions that crash the
  emulator, therefore mask off all exception bits to stop that.
  (joncampbell123)
• Added code to mouse emulation to control how often the mouse
  reports events through the interrupt. Added dosbox.conf option
  to allow the user to force a report rate, which can be used to
  force a lower than normal report rate for games that cannot
  proprly handle higher ones. Allow PS/2 mouse emulation, if
  rate not set by user, to control report rate. (joncampbell123).
• Add code to COMMAND.COM to flush keyboard input before running
  the command given by the user, and flush again when the command
  returns. Added option to dosbox.conf to enable/disable this
  function (joncampbell123)
• Fix bug where Tandy mode ignored the "allow more than 640kb"
  setting.
• Fix INT13h AH=02 broken conditional branch which prevents
  installer of game "Inherit the Earth: Quest for the Orb"
  to obtain free space of hard drive (maron2000)
• qcow2 image support: Make image able to be mounted by
  drive letters (experimental) (maron2000)
• VHD image support: Make file name check for .vhd extension
  to be case insensitive (maron2000)
• VHD image support: Fix auto-detection of geometry (maron2000)
• Sound Blaster: Added code to periodically check the user's
  settings regarding recording source selection and listening.
  This should allow the user to change those settings on the
  fly. (joncampbell123).
• Sound Blaster: Added options to control whether the generated
  recording source is audible through the speakers, and what
  generated audio to send to the client. Options are: silence,
  hiss, and a 1KHz test tone. (joncampbell123).
• Sound Blaster: If the DSP is recording rather than playing,
  then send audio to the guest at the recording sample rate
  containing some form of generated audio. Default is silence.
  This ALSO satisfies the Creative driver CTSB16.SYS when it
  does the DMA test at startup. (joncampbell123).
• Sound Blaster: Fixed code to properly recognize when the
  guest wants to record audio, including through SB16
  commands. Prior to this fix, all SB16 Bxh-Cxh commands
  were handled as if playback even if the command would
  instead trigger recording. (joncampbell123).
• Sound Blaster: Add missing update of "last DMA callback"
  timestamp that is needed for when the guest pauses DMA
  during playback or recording. (joncampbell123).
• VHD image support: If the VHD image is not a fixed type,
  say so in the log (previously it said nothing) and say
  what kind of image was mounted (joncampbell123).
• Added INT 13h AH=44h Extended Verify to satisfy any disk
  utilities that might u...

DOSBox-X 2022.12.26 2022-12-26 19:55

2022.12.26

• Allow more than 640KB of conventional memory,
  regardless of "allow more than 640kb" option, for
  Tandy machine type. The setting is capped to 768KB
  to reflect Tandy systems with that upgrade, which
  is said to allow a full 640KB for DOS and 128KB for
  video RAM without any conflict from the MCB chain.
  Adjust Tandy video emulation for 768KB case. This
  fixes "Might and Magic III Isles of Terra" crashes
  in Tandy mode and Tandy graphics because the game
  does not correctly handle the memory configuration
  when less RAM is involved. (joncampbell123).
• Fix code page CPI/CPX loader to allocate 128KB of
  memory instead of 84KB. The code allocates a 64KB
  stack for the executable code within. The 84KB
  allocation permitted the initial stack pointer to
  exist beyond available conventional memory if
  conventional memory size was below about 156KB and
  cause a crash. This is a quick fix, a long term fix
  would be to instead set the initial stack pointer
  to some offset below 0xFFFE based on available memory,
  just as the .COM executable loader was modified to do
  some time back to enable proper execution when
  memsize < 64KB. (joncampbell123)
• Do not load country/font information at startup
  if the code page to load is the same as the default
  code page. (joncampbell123)
• Fix Tab/Shift+Tab in Configuration GUI regarding
  setting text fields that have a ... button to select
  from an enumeration. Those buttons are no longer a
  trap for tab enumeration. (joncampbell123)
• Fix Mac OS SDL1 keyboard support code to properly
  fill in unicode character values in relation to
  IME checks. This fixes a problem where it was
  impossible to type anything in the configuration GUI
  in SDL1 Mac OS builds. (joncampbell123)
• Mark VBE mode 0x212 as "do not list" so that it does
  not appear in normal VBE mode enumeration, while
  keeping it valid for the Windows 3.1 driver which
  assumes the mode is there at that number without
  enumeration. By not listing the mode, drivers like
  VBEMP and DOS application code will not attempt to
  use it. There is already another mode number for
  640x480 24bpp anyway. (joncampbell123)
• Fix VBE mode 0x212, which is 640x480 24bpp packed
  mode but with a per scanline stride of 2048 bytes
  per pixel set aside for the Windows 3.1 driver and
  the "640x480 (1Meg) 16 million colors" setting,
  so that the VBE "Get Mode Info" call reflects the
  proper per-scanline stride instead of the ideal one.
  This should fix complaints about VBEMP and 640x480
  24-bit color mode. Given how minimal the use of the
  mode is by the Windows 3.1 driver, the 2048 byte
  mode does not permit setting scan line length or
  display start i.e. panning is not permitted.
  (joncampbell123).
• Fix Pentium Pro emulation to support microcode
  related MSRs so that Windows 98 does not crash
  on startup when cputype=ppro_slow. (joncampbell123).
• Added SMV debugger command. This is the linear
  (virtual) equivalent of the SM "Set Memory"
  command. (joncampbell123).
  (#3826)
• Fix debugger help command to list both C / D commands
  and the DV/DP commands. (joncampbell123)
• Add VGA FONTDUMP debugger command for those
  who might want to take custom fonts in text
  mode and do something with them outside the
  emulator. "VGA FONTDUMP" followed by a filename
  which must have the extension .BIN (for a raw
  64KB dump of font RAM) or .BMP (for a formatted
  dump as a monochrome bitmap file). (joncampbell123).
• Disabled code to randomly return GDC drawing
  status active. The implementation was causing
  severe performance issues. The code has not
  been removed because it could be optimized and
  fixed and could even follow the state of GDC
  drawing. (joncampbell123)
• VGA 6-bit DAC mode expand to full 8-bit range,
  instead of simple shifting (joncampbell123).
• Fix 8254 PIT emulation (joncampbell123)
• Add dosbox.conf option "cpuid string" to allow
  CPUID to return custom ID strings instead of just
  "GenuineIntel". Have fun! (joncampbell123)
• Fixed build to properly compile against internal
  SDL/SDL2 library even if an external version is
  available (joncampbell123)
• Fixed some violations of the one definition rule.
  (Jookia)
• Use pkg-config to find OpenGL (Jookia)
• Updated Flatpak SDK and dependencies (Jookia)
• PC-98 Implement AVSDRV.SYS PCM function (int D9h)
  (nanshiki)
• PC-98 Support 6x8 Katakana font with int 18h ah=14h
  (nanshiki)
• PC-98 Fix Audio Q-Channel info in MSCDEX (nanshiki)
• Fixed FFMPEG 5 compatibility (Jookia)
• Fix FFMPEG crash if FFMPEG fails to write header
  for some reason. (joncampbell123)
• Fix setcap on systems with split /usr (Jookia)
• Fix building with --disable-core-inline (Jookia)
• Fix building not finding fluidsynth (Jookia)
• Fix some NetBSD build issues
  (Jookia, with patch from Nia)
• Fix minor graphical issues in mapper GUI (aybe)
• Removed --disable-core-inline (Jookia)
• Swap SDL2 XInput axes by default for a better
  out of the box experience (aybe)
• SDL1 XInput is now enabled by default for
  a better out of the box experience (aybe)
• add set of cga shaders from dosbox staging (aybe)
• Updated mt32emu code to latest(2.7.0).(maron2000)
  Also, added config option "mt32.engage.channel1"
  (Refer to https://github.com/munt/munt for details)
• Fix missing line in printouts (Issue #3569)
  (maron2000)
• Adjust Int 11 return value to better match real
  BIOSes. (Allofich)
• Limit the "always return bit 6 of port 61h as set
  for PC" change to only apply to early PC types
  (MDA, CGA or Hercules). (Allofich)
• Integrated SVN commits (Allofich)
  • r4476: Preserve last error code when no error
    occurs.
  • r4477, r4478: Drive system improvements.
  • r4479: Correct handling of invalid encodings of
    the BOUND instruction.
  • r4480: Some confirmed DOS behaviors and minor
    cleanup.
  • r4481: Push registers for most DOS function calls;
    prevents a bug in UNLZEXE from causing a crash, and
    maybe helps other buggy programs and unusual cases.
    Use real addressing to support stack pointer wraparound.
• Fix Opl3! Duo and Opl2 Audio board audio playback on
  unix (stengun)
• Fix Japanese input related issues (nanshiki)
• Fix START command only ever opens first file
  (NebularNerd, darac-10, aybe)
• Win32 logging console (aybe)
  • add 'Debug/Clear logging console' menu entry
  • ensure main window stays above it when shown
• Fix overflow in mapper info on SDL2 builds (aybe)
• Enable OpenGL output in MinGW builds again (maron2000)
• Fixed to display IME marked text in SDL2 version on
  macOS (nanshiki)
• Fix allocation of IDE slots when mounting images by
  IMGMOUNT (maron2000)
• Increase of sprintf buffer size in Program::WriteOut()
  (caiiiycuk)
• Fix unexpected behavior of swapping multiple CD images
  (maron2000)
• Fixed build on NetBSD and FreeBSD (Jookia)

DOSBox-X 2022.09.0 (0.84.3) 2022-09-01 16:22

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

2022.09.0 (0.84.3)

• Added 86PCM support for PC-98 emulation. (nanshiki)
• Added German language translation. (Link-Mario)
• Added code page 867 (compatible with Hebrew DOS
  WordPerfect) and 868 (Urdu) for the guest-to-host
  code page conversions. (Wengier)
• Improved ANSI.SYS detection for the welcome banner
  and CLS command. The command "INTRO WELCOME" will
  re-display the welcome banner without running the
  commands in AUTOEXEC.BAT. (Wengier)
• Improved IME support on macOS SDL2 build. (Wengier)
• Improved detection for the Chinese/Japanese/Korean
  keyboard layouts on Windows platform. (Wengier)
• Improved Windows installer for selecting languages
  for the DOS emulator. (Wengier)
• Improved config option "file access tries" for the
  Linux and macOS platforms. (Wengier)
• Fixed SafeDisc 2 check for Red Alert 2 by renaming
  the IDE CD-ROM device. (rderooy & psyraven)
• Fixed problem when inputting characters with call
  INT21/AH=3Fh in PC-98 mode. (nanshiki)
• Fixed hang on zip-mounted drives and minor bug on
  the DOS file-read code. (tbr)
• Fixed file copying problem with Windows 9x install
  at the end of the DOS-based Setup. (Wengier)
• Fixed command like "IF NOT EXIST D:\NUL ..." not
  working if the drive does not exist. (Wengier)
• Fixed that pasting text from clipboard via mouse
  may not work properly in some cases. (Wengier)
• Fixed the mouse scrolling wheel not working with
  CTMOUSE 2.1's "CTMOUSE /O" in guest DOS. (Wengier)
• Fixed window transparency setting not working in
  macOS SDL1 build. (Wengier)
• Fixed macOS small display issue with the in-tree
  SDL2 library by applying SDL updates. (Wengier)
• Fixed menu option "Always on top" to work with the
  in-tree SDL2 library on macOS. (Wengier)
• Fixed the terminal mess-up issue with -display2
  option on Linux and macOS platforms. (Wengier)
• Fixed OpenGL output options not working in Windows
  ARM32/ARM64 builds. (Wengier)

DOSBox-X 2022.08.0 (0.84.2) 2022-08-01 13:28

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.

2022.08.0 (0.84.2)

• Fill in PC-98 BIOS data area byte value indicating
  CPU type (whether 8086, 286, 386 or higher)
  (Wengier), fill it in at startup (joncampbell123).
• CHOICE now supports breaking and errors on end of
  file or pipe instead of freezing DOSBox-X. (Jookia)
• Fixed debugger commands parsing numbers wrong. (Jookia)
• Fixed DIR crashing on volumes with more than
  999,999,999,999 bytes of free space. (Jookia)
• Switched to year.month.patch versioning (Jookia)
• Fix NE2000 panicking if packets are queued too fast.
  (kcgen, Jookia)
• Fix ISO image format detection to support pure
  UDF formatted images, meaning that the image
  lacks any ISO 9660 features and contains only
  UDF. (joncampbell123).
• Added support for UDF filesystem to ISO image
  handling. It is enabled by default if emulating
  MS-DOS 7.10 (aka Windows 98) or higher.
  (joncampbell123).
• Added code to detect Rock Ridge according to the
  System Use Sharing Protocol standard, and to
  read the SUSP entries correctly for the alternate
  name, if enabled. (joncampbell123)
• Updated ISO MSCDEX drive emulation to scan the
  available volumes in the ISO image rather than
  assume the first volume, which makes Joilet
  support possible if long filenames are enabled
  and the DOS version is 7.0 or higher. (joncampbell123).
• Add IMGMOUNT -o option for ISO filesystem support
  to enable/disable Joliet extensions, which is a
  Microsoft extension to ISO 9660 where long names
  encoded using Unicode UCS-16 exist as a supplementary
  volume in the ISO image and are used by Windows 95
  and higher to support long filenames on CD-ROM.
  Added support for reading the Joliet volume and
  providing them for both the 8.3 and long filename
  APIs in DOS. (joncampbell123).
• Add IMGMOUNT -o option for ISO filesystem support
  to enable/disable Rock Ridge long filename support.
  The option is -o rr=1 to enable and -o rr=0 to
  disable. (joncampbell123).
• Fixed 8.3 name generations on ISO drives with Rock
  Ridge extension. The ISO drives can be refreshed
  via RESCAN command like other drives. (Wengier)
• SDL_Net support is available for HX-DOS builds,
  similar to other builds. Packet driver is needed
  for network capability in DOS. (Wengier)
• Fixed line endings when copying to shared clipboard
  (e.g. CLIP$) in non-Windows platforms. (Wengier)
• Fixed problems with SDL1 Windows builds in which
  the user had to type the Fullscreen mapper shortcut
  twice. It seems a SDL1 library function that is
  used to indicate ignoring or adding a class of
  events also liked to flush the event queue. This
  is called on mode change. This caused lost
  keystrokes, leaving the mapper the impression that
  those keys were still held down. (joncampbell123).
• Fixed PC-98 mode MS-DOS 7/Windows 9x boot disk's
  80386 CPU check. (Wengier)
• Added support for auto-converting non-image drives
  (such as mounted local drives) to disk images, so
  that they will be visible when booting into guest
  systems. A config option "convertdrivefat" (in
  [dosbox] section) is added to toggle this setting,
  or you can toggle via BOOT command's -convertfat
  (or -convertfatro option for read-only access) and
  -noconvertfat options. There're also config options
  "convert fat free space" (in [dosbox] section) and
  "drive z convert fat" (in [dos] section) to control
  free space (in MB; 0 means read-only) and whether
  to also convert virtual drive Z:. Much of the code
  is imported from DOSBox Pure, with added support
  for PC-98 HDI and code page conversions. (Wengier)
• Added menu option "Save to disk image" (under drive
  letter in "Drive" menu) to save a mounted non-FAT
  drive to selected disk image (IMG/HDI). (Wengier)
• Added the "Limit disk transfer speed" menu group
  (under "DOS") to toggle the hard & floppy disk data
  rate function. Also moved "Quick launch program..."
  menu from "DOS" menu to "Main" menu. (Wengier)
• Added code pages 856 (Hebrew) and 859 (Latin 9) for
  the guest-to-host code page conversions. (Wengier)
• Added config option to allow create of temporary
  devices for piping operations when a temporary DOS
  path is not available. (Wengier)
• Added support for ATAPI raw sector reading with
  READ CD command. (schellingb)
• Report bad sectors recorded in raw CD images as
  ATAPI read errors. (schellingb)
• You can use CONFIG -set langcp=... to change the
  current language along with the embedded code page,
  or CHCP nnn:... to specify a language file as well,
  e.g. "CHCP 932:" or "CHCP 932:ja_JP" for Japanese
  code page and language file. Also improved -langcp
  option for SBCS code pages, and Windows installer
  will additionally set keyboard layouts for the
  selected languages. (Wengier)
• Changed menu option "Restart DOSBox-X with language
  file..." to "Load language file..." for loading
  language files without rebooting DOSBox-X, unless
  a guest system is currently running. (Wengier)
• Imported the more recent MBR code from FreeDOS to
  avoid the "boot menu" as in older code. (Wengier)
• When changing TTF font, DOSBox-X will try to show
  the number of missing characters in the new TTF
  font (if any). (Wengier)
• Fixed color becoming darker after changing TTF font
  multiples times in TTF output. (Wengier)
• Fixed display of individual/total file sizes with
  DIR command when they are very large. (Wengier)
• Fixed non-US code page conversions for mounted FAT
  drives. (Wengier)
• Fixed incorrect message displays in Configuration
  Tool and Mapper Editor when booting into guest
  systems with language files. (Wengier)
• Fixed possible "Path not found" bug when switching
  to code page 950 from another code page. (Wengier)
• Fixed creating directories may not work properly
  for overlay drives on Windows systems. (Wengier)
• Fixed -set and -get options of CONFIG command when
  there are spaces in property names, without having
  to prepend the section names. For example, command
  CONFIG -get "synchronize time" is supported just
  as CONFIG -get "dosbox synchronize time". Similar
  for -SET option when launching DOSBox-X. (Wengier)

DOSBox-X 0.84.1 2022-07-01 09:45

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.

0.84.1

• Added dosbox(-x).conf option to enable workaround
  for errant DOS programs that set the TF (trap flag)
  and then crash. Added code to DOS kernel INT 01h
  handler to clear TF flag if instructed to by the
  dosbox(-x).conf setting which can prevent such
  errant programs from crashing. Needed for 1996 demo
  "Dyslexia" by Threesome. (joncampbell123)
• Fix RETF instruction handling to only modify the
  low 16 bits of ESP in real mode, even if the
  immediate value for RETF is a large value like
  FFFEh (fix for Finster by Mad Scientists). Prior
  to this fix, it was possible to increment the
  upper 32 bits of ESP from real mode using a
  normal 16-bit RETF with a very large immediate
  value. This fix removes the need for the ENTER
  masking dosbox(-x).conf option entirely and allows
  Finster to run without it. (joncampbell123).
• Added dosbox(-x).conf option to control whether the
  ENTER instruction masks the stack pointer to 64KB
  if the stack segment is 16-bit, which is off by
  default because real Intel processors do not do
  that. (joncampbell123).
• Added dosbox(-x).conf option that can instruct EGA/
  VGA emulation to ignore the display blanking bit in
  the sequencer registers. Some games appear to have
  bugs in their VGA programming code that can
  accidentally set that bit and therefore show
  nothing on screen. Fix for 1996 game "Finster" by
  Mad Scientists. The game appears to make this
  programming mistake on any fork of DOSBox
  including DOSBox-X, and is reported to also make
  the same mistake on other emulators like 86box.
  However most forks of DOSBox have a matching bug
  in their VGA emulation that allows the blanked
  display to appear normally regardless of that
  register bit unless run with machine=vgaonly.
  It's unclear if there is anything about DOSBox
  or DOSBox-X emulation that causes the game to
  misprogram the registers. (joncampbell123).
• If guest uses ENTER instruction from 16-bit code
  with 66h (32-bit operand) prefix, and the CPU is
  in real mode or the stack segment is 16-bit, mask
  stack pointer with 0xFFFF. This fixes 1996 game
  "Finster" by Mad Scientists (joncampbell123).
• DOSBox-X will now search for resource files such as
  fonts and translations in the resource directory (
  C:/DOSBox-X in Windows, /usr/(local/)share/dosbox-x
  in Linux, and dosbox-x.app/Contents/Resources in
  macOS) in addition to other locations. (Wengier)
• Updated DOSBox-X's integration device to version
  1.0.1, adding API calls such as DOSBox-X's version
  number and platform, and some DOS-related status
  such as DOS version number. (Wengier)
• Improve the HX-DOS build package, including the
  TTF output support and accessory files. (Wengier)
• Use long double for internal event scheduling
  if available, to improve accuracy (joncampbell123).
• Fix remaining SDL2 Windows problems by adding
  missing break statement above window event
  handler. (joncampbell123).
• Move "Always on top" menu option from "Video" to
  "Main" menu, also enabled for Windows/macOS SDL2
  builds when possible. (Wengier)
• Add workarounds for SDL2 builds to avoid problems
  with window resize, menu update, and restore
  events that sometimes caused the emulator to hang
  on startup in Windows. (joncampbell123).
• Add "Set transparency..." and "Set text in title
  bar..." menu options under "Video" to change window
  transparency and title bar text. (Wengier)
• Add special properties to CONFIG command including
  "system" and "version". (Wengier)
• Fix DOS 8.3 filename generations when there are
  special characters in the filenames. (Wengier)
• Fix creation of disk images with spaces using the
  "Create blank disk image..." menu option. (Wengier)
• Fix IMGMAKE to provide executable code in MS-DOS
  partition or floppy disk boot sector following
  the BPB, that prints "This is not a bootable disk"
  instead of leaving zeros that lead the CPU astray
  and possibly hang the system in the event anything
  tries to boot the partition (joncampbell123).
• Fix emulator segfault on invalid encoding of
  BOUND instruction (joncampbell123).
• Address auto-centering on mode change complaints
  by making the "-" setting of windowposition the
  default. (joncampbell123).
• Added MinGW-lowend SDL2 build, which is compatible
  with Windows XP. Also updated the build selection
  page for Windows installers. (Wengier)
• Fix windows transparency during TTF output switch
  in Windows SDL2 builds. (Wengier)
• Fix SDL2 Windows builds to flag a resize as not
  user initiated only if the presence of the menu
  bar changes. This fixes a problem where SDL2
  builds did not acknowledge window resize events
  at all. (joncampbell123).
• Fix FluidSynth weird sound issue in 32-bit Visual
  Studio SDL2 build. (Wengier)
• Fluidsynth: Fix uninitialized conditional object
  init in Windows builds (joncampbell123).
• Linux/X11: Add an X11 error handler function to
  handle the occasional X11 error that can happen
  within the SDL2 library if certain events, like
  window resize, occur too frequently. The custom
  error handler logs the error but does not abort
  the emulator like the default one would.
  (joncampbell123).
• Fix SDL2 builds with output=surface not to render
  if the window at any point is too small. Resizing
  the window below the minimum supported by the
  DOS screen will not longer trigger segfaults or
  assertion failures. Issue #3348. (joncampbell123).
• Fix IME not working on Windows when -langcp option
  is used to load a language with DBCS codepage, or
  in 32-bit MinGW lowend SDL1 build. (Wengier)
• Fixed INT 10h failing to fully clear Tandy video
  memory when entering 16-color graphics modes.
  (joncampbell123).
• Fixed missing/NULL INT 1Fh interrupt vector with
  CGA/PCjr/Tandy machine types. DOS games that print
  to screen using INT 10h in graphics modes can now
  print extended (>=128) character codes correctly.
  This fixes "BushBuck: A Treasure Hunt" and enables
  it's rather odd Tandy detection routine to work
  with machine=tandy. (joncampbell123).
• Disney Sound Source: Fix problems between Disney
  sound source and parallel port emulation. Fix the
  code to enable Disney Sound System emulation either
  by disney=true (DOSBox SVN compatible) or
  parallel1=disney (The DOSBox-X way). (joncampbell123).
• DOS SHELL: Change shell command parsing to make
  unusual combinations of command plus trailing
  command possible such as ECHO. ECHO; ECHO: ECHO[
  ECHO] ECHO\ ECHO/ ECHO" ECHO+ (issue #3503).
  (joncampbell123).
• DIR command supports more sorting methods including
  "DIR /OGD", "DIR /OGE", and "DIR /OGS". (Wengier)
• Support for BDF and PCF bitmap fonts for DOS/V
  functions, such as the free WenQuanYi bitmap font
  (bundled for displaying CJK characters). (Wengier)
• EGA: Add machine type to emulate 200-line (CGA
  compatible) EGA display mode, machine=ega200.
  All text modes have 8x8 character cells, use CGA
  compatible video timing, and the 640x350 modes
  are not available. Fix EGA display offset register
  usage to properly work with alphanumeric text
  mode when "word mode" is turned off. This fixes
  IBM demonstration program "Fantasy Land".
  (joncampbell123).
• IDE: Remove extra state from IDE controller that
  is managed by the drive. The ATA-1 standard seems
  to say that status and drive/head registers on
  read back always come from the ATA device.
  (joncampbell123).
• IDE: If ATA device is busy, all IDE registers
  return the status register and BSY bit according
  to ATA-1 standard (joncampbell123).
• IDE ATAPI CD-ROM: Add ATAPI command BEh READ CD.
  This command is like the 28h/A8h READ command but
  specific to the CD/CD-ROM format and allows reading
  the various sector types including data sectors and
  CD audio. Windows NT 4.0 requires this, or else it
  treats the CD-ROM drive like a non-working device.
  (joncampbell123).

DOSBox-X 0.84.0 2022-05-31 20:25

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.

0.84.0

• CMOS century register now aliased to register
  32h and 37h to appease Windows 2000, which assumes
  the century is stored there and will complain
  about invalid date/time otherwise (joncampbell123).
• Treat IDE command E7h (FLUSH CACHE) as a no-op
  so that the common use of it from Windows 2000
  doesn't spam your log file (joncampbell123).
• BIOS: At post, if DOS kernel was active and the
  DOS Shell was still running, initiate a proper
  system reset event. Some software, including the
  WINNT.EXE install program for Windows NT, like to
  restart the system by JMPing to the BIOS POST
  entry point. Prior to this fix, doing that from a
  DOS program caused instability with mounted images
  and the DOS shell due to recursion. (joncampbell123).
• Fix FPU implementation for aarch64 cores (cimarronm)
• Fixed INT 10h and DAC palette mapping to resolve
  incorrect colors with Hercules graphics mode when
  a game calls INT 10h to set video mode after setting
  it up. This resolves the incorrect blue on black
  color map for Grand Prix by Accolade (joncampbell123).
• Add recursive mkdir_p() directory creation so that
  overlay filesystem support can correctly create
  a subdirectory of any depth, instead of only one
  level deep from an existing directory on disk.
  (joncampbell123)
• Add dosbox(-x).conf option "isapnpport" to control
  whether the ISA Plug & Play I/O port is presented
  to the guest. Setting is "true", "false", or "auto".
  "auto" means to enable if PnP BIOS is enabled.
  Previously this port was always present even if
  the PnP BIOS was not. Some operating systems,
  including Windows NT/2000/XP, will enumerate ISA
  Plug & Play hardware by themselves whether or not
  the PnP BIOS is present. (joncampbell123)
• Fix FPU operations using the top of stack on
  32-bit VS builds (cimarronm)
• Add IDE ATAPI command MECHANISM STATUS for
  Windows NT 4.0 because that system seems
  to want to know if your CD-ROM drive is a
  CD changer (joncampbell123)
• IDE Plug & Play resource descriptor changed to use
  2-byte structure for listing IRQ resource instead of
  3 bytes. This (for some reason) fixes problems with
  the IDE driver in Windows NT 4.0, Windows 2000, and
  Windows XP and allows them to boot properly.
  (joncampbell123)
• INT 13h extensions function 48h is supposed to
  return physical geometry, not the logical geometry
  normally returned by function 08h. This means for
  IDE devices, to return the geometry the IDE controller
  is using. (joncampbell123)
• Enhanced the Mapper Editor interface. The Mapper UI
  has been greatly improved. (aybe)
• Add IDE ATAPI command MECHANISM STATUS for Windows
  NT 4.0 because that system seems to want to know if
  your CD-ROM drive is a CD changer. (joncampbell123)
• Fix IDE devices to start up with the drive ready
  bit set for OSes that expect it when probing IDE
  devices. This allows the Linux kernel to see IDE
  ATA drives emulated by DOSBox-X. (joncampbell123)
• Fix IDE ATAPI emulation to correctly handle CD
  READ across one or more DRQ block transfers. Use
  block size given by guest in consideration of DRQ
  block size, which allows ATAPI CD-ROM emulation to
  work properly with the Linux kernel. (joncampbell123)
• Add debug command to show PC-98 color palettes.
  Corrected typo. (joncampbell123)
• Add support for PC-98 monochrome graphics mode.
  (joncampbell123)
• IDE emulation now handles implementation events per
  IDE device instead of per IDE controller, which
  may resolve IDE controller issues with some guests.
  (joncampbell123)
• Added PC-98 GDC drawing commands, which is
  based on Neko Project II source code (nanshiki)
• Added PC-98 LIO BIOS interface, which is based on
  Neko Project II source code (nanshiki)
• INT 21h AH=31h Terminate And Stay Resident: If the
  program called INT 21h to free its own PSP segment,
  reassign the block back to the program as allocated
  and then resize as expected. Needed for PC-98 game
  "Yu No" in which PLAY6.EXE, one of the resident
  drivers used for music, does just that. (joncampbell123)
• Add a hack to enable read access to port 0xa460 on PC-98 which
  returns Sound ID to detect the sound board available.
  Note that the current hack returns Sound ID of PC-9801-86 board
  regardless of the board selected to emulate. (maron2000)
• Adds WINCHECK to list of programs which should not
  return a valid installation check for WinOldAp
  (AX=1700h/int2fh) so it doesn't mistakenly believe
  Windows is running (cimarronm)
• Add minimal support for IDE SET FEATURES command EFh.
  (joncampbell123)
• Fix CMPXCHG8B to change only the ZF flag, instead of
  changing ZF with other flags in an undefined state
  afterwards. This fixes problems with the Windows 2000
  kernel booting up and cputype=pentium (though I am
  unable to get past the INACCESSIBLE_BOOT_DEVICE error).
  (joncampbell123)
• Updates XADD instruction to set appropriate flags
  (cimarronm)
• Updates to FPU to handle opcode size prefix (66h)
  on FSTENV/FLDENV/FSAVE/FRSTOR instructions (cimarronm)
• Update FLD constant FPU instructions to more
  accurately match FPU implementations (cimarronm)
• Fixed dynamic_dynrec being displayed as dynamic_x86
  in menu, and PREFETCH instruction breakage in the
  dynamic core. (Jookia)
• Fixed crash if no dynamic cores available (Jookia)
• Fixed TTF mode breaking a guest not running the
  DOS kernel. (Jookia)
• Fix DBCS table initialization on reset and
  restart (cimarronm)
• Fixed some guest systems may not work as expected
  in non-TTF outputs. (Wengier)
• Fixed IME input not working in MinGW builds, and
  FluidSynth in MinGW-lowend builds. (Wengier)
• Fixed resizable OpenGL Voodoo window not working
  properly on Windows in previous version. (Wengier)
• Fixed commands "CHOICE /N /C:123" and "MIXER /GUI"
  not working properly in previous version. (Wengier)
• Integrated commits from mainline (Allofich)
  • Disable leading directory validity check in
    DOS_FindDevice.