DOSBox-X

Logos
Logos
Logos
Logos
Logos

MS-DOS

IBM PC

PC-98

https://dosbox-x.com

Version

2025.02.01

Mise à jour

1 février, 2025

Téléchargement Mac

https://github.com/joncampbel…

Formule Homebrew

brew install dosbox-x

Code Source

https://github.com/joncampbel…

Reprise de l'émulateur original DosBox incluant le support du 3Dfx et permettant d'installer un Windows jusqu'au 98 et émulant même le PC-98. Les sources, compatibles SDL 1 et 2, sont disponibles. Une build pour processeurs Intel est disponible sur le GitHub officiel. Le build OSX Intel demande au minimum High Sierra (10.13).

Un ancien build OSX officiel connu demandant 10.11 minimum est le 20160219. Sinon nous vous proposons au choix un build de la version 0.82.2 ou de la version 0.82.4 compatibles OSX 10.10. Très proche de DOSBox, retrouvez nos articles sur ce dernier concernant son utilisation et sa configuration, très semblable.

Changelog

2025.02.01

Added new experimental dosbox.conf option that turns off the
A20 gate automatically if loading a COM/EXE file to a memory
location below 64KB. Option is off by default. This is intended
for the startup routines of programs that assume 8086 wraparound
to prevent them from crashing (joncampbell123).
Bump tinyfiledialogs to v3.19.1 (maron2000)
Fix VGA render-on-demand bug that causes all screen updates to
stop working if something changes video state without changing
any other attribute (width, height, frame rate, etc.). In
PC-98 mode this bug could be triggered by leaving the text
layer open while switching off the graphics layer when the
graphics layer is in 256-color PEGC mode. Fix for KOARMADA.EXE
when exiting back to the DOS prompt. (joncampbell123).
In PC-98 mode, add I/O port 43Bh which guest applications can
then read to determine whether the 15MB "memory hole" is open.
The guest can use this bit to determine whether the PEGC 256-color
framebuffer is available at that location, or whether that is
just plain system memory. Added for homebrew PC-9821 project
KOARMADA.EXE which uses that bit to determine how to talk to
the framebuffer. (joncampbell123).
Fix keyboard ISR in PC-98 mode to assume there is data waiting
from the keyboard I/O ports (then check the status for more).
The reason is that CWSDPMI.EXE for PC-98 has a keyboard ISR
of it's own that reads the scan code first (which clears the
"data available" bit) before then passing control to the
real-mode keyboard ISR. If our keyboard ISR first checks for
status in that case it will never see any keyboard data and
keyboard input will never register to the guest while running
under CWSDPMI (joncampbell123).
Fix BIOS POST location (F000:FFF0) JMP instruction in PC-98 mode
so that the segment value of the JMP instruction matches a
specific value that the DJGPP C runtime checks for to detect
PC-98. (joncampbell123).
Stop serving IBM PC-specific CWSDPMI.EXE in NEC PC-98 mode.
It happens to work unless any interrupt or exception happens.
Instead, provide an alternate common version of CWSDPMI.EXE
that was patched to support PC-98 machines when machine=pc98
(joncampbell123).
Add support for ucrt64 builds (maron2000)
DOS CTRL+C handling: Remove NULL vector check because built-in
COMMAND.COM long ago was fixed to provide a CTRL+C vector. Fix
code to use a different value for the C++ exception so that it
cannot be confused for any other common signal in the emulator
(joncampbell123).
Remove DOSBox Integration Device VGA "self capture",
which was never used much anyway, as part of cleanup (joncampbell123).
x86 paging: Remove unused non-"full TLB" code. (joncampbell123).
Use mmap() to allocate system memory if available. This is
for future work that may involve something that requires
page-aligned allocation, such as KVM support in Linux (joncampbell123).
VGA cleanup, organization (joncampbell123).
Fixed regression of specifying DBCS fontx file was ignored. (maron2000)
Fixed mistakes in adding double quotes to filenames to pass to IMGMOUNT
command, and syntax errors in showing a message dialog box. (maron2000)
Fixed bug where bios memSize was not set when using TTF. (maitchison)
Fixed CMS was always disabled regardless of config settings. (xrip)
Switch off TTF mode in text modes not working in TTF mode. (maron2000)
Gravis Ultrasound: Add dosbox.conf option that when enabled,
prints a warning to the log file every time the guest pokes
data into GUS RAM beyond the 1MB supported by the card,
in order to better identify errant Demoscene code and/or
any bugs in new tracker code currently in development. (joncampbell123)
VGA: Fix buffer overrun that can occur with 4bpp planar
16-color modes if the guest writes beyond the first 2MB
of video RAM. The planar support code also copies the 3rd
bitplane to a font RAM array used in EGA/VGA text mode.
This font RAM array is only 512KB, therefore in planar
memory space, writes beyond (2MB/4) = 512KB cause corruption
of emulator state and possibly crashes. Solve the issue
therefore by not copying to font RAM beyond 512KB. (joncampbell123)
VESA BIOS support: Fix VGA draw and bank switching code
to ensure that the guest cannot write outside video RAM
limits, and fix VBE bank switching code to consider 4bpp
planar SVGA modes properly. (joncampbell123)
VESA BIOS support: Fix scan line and page calculations related
to 4bpp planar 16-color SVGA modes. (joncampbell123)
VESA BIOS support: Fix 24bpp RGB bugs related to VBE calls
that control scan line length and display panning/scrolling.
Now VBETEST can test 24bpp panning without potentially giving
the user an epileptic seizure, and there are no more overlong
scanlines. (joncampbell123)
VESA BIOS support: Correct mode information for SVGA text modes (joncampbell123)
VESA BIOS support: Like real Pentium-era hardware, do not
list 4bpp planar 16-color modes as having a linear framebuffer.
Most SVGA cards only support planar VGA memory within the
standard VGA A0000-BFFFFh region and do not support the same
up in the linear framebuffer area. (joncampbell123)
Save state support: Let the option to control whether or not
compression is applied, apply to the ZIP compression. If you
turn off compression, the ZIP file uses "store" mode instead,
otherwise compresses as normal. (joncampbell123)
It turns out that for whatever reason, the savestate code was
compressing the state twice. Once by itself, and then again when
writing to the ZIP archive. Furthermore, storing the original
length at the end of the compressed data using size_t is a big
problem. Remove the extra compression/decompression and let the
ZIP file support do the compression. Save states from now on
will be marked as "No compression" for at least some backwards
compatibility. (joncampbell123)
Volume label cleanup and fixes. Do not pad labels with white spaces. (maron2000)
Some NEC PC-98 games that support MIDI through MPU-401 like to use
Roland GS-specific SysEx messages to control master volume and
reset the MIDI synth, instead of standard messages. These games
were known in DOSBox-X to have problems with MIDI stuck notes and
hanging notes for this reason. Added code to recognize Roland GS
reset SysEx and reissue it as standard MIDI reset, to resolve that.
Added code to Fluidsynth MIDI support to recognize the Roland GS
master volume SysEx commands and apply it to the output, which
allows these games to "fade out" the MIDI properly. PC-98 games
should no longer have hanging/stuck MIDI notes (joncampbell123).
Fix VESA BIOS modelist mistake that marked all "high definition"
modes as modes to round bytes per line up to a power of 2 (joncampbell123)
Fix memory size register determination for S3 Virge/VX (clbianco)
Fixed a Y2038 bug by replacing Int32x32To64 with regular multiplication.
(CookiePLMonster)
Fixed pasting Bell code (0x07) from clipboard was ignored. (maron2000)
Fixed a segfault crash when pasting the content of clipboard is empty
or consists of invalid characters only. (maron2000)
Fixed crash when trying to access MOUNTed empty physical CD/Floppy
drives. (maron2000)

2025.01.01

Fix bug that prevented the Configuration GUI from saving to dosbox.conf
the last Windows 3.1 theme you applied using the dropdown menu.
(joncampbell123).
Add option to apply vmemdelay to SVGA and linear framebuffer
modes (such as VESA BIOS modes), which reduces emulator performance
for those modes, but allows you to emulate slower SVGA cards.
Due to how some machine types are emulated, this option also enables
vmemdelay to affect the PC-98 linear framebuffer, Tandy & PCjr
video modes, as well as MDA/Hercules. (joncampbell123).
Add workaround to CPU reset logic that allows it to work correctly
even with dynamic core. Previously, if the guest reset the system,
the emulator would crash with an error message about an uncaught
C++ exception because C++ exception handling doesn't work with
dynamically generated code. (joncampbell123).
Correct CPUID family/model/brand values for cputype=pentium_iii.
Add CPUID level 2, which returns "processor configuration
descriptors", and return documented Pentium III values. Apparently
Windows XP really REALLY cares about these configuration
descriptors and will hang in-kernel in an infinite loop at bootup
without these apparently really important values. This change
makes it possible to boot Windows XP with Pentium III emulation.
(joncampbell123).
Allow values of memsize to represent 4GB or more of RAM. Up to
1TB, if Pentium PSE extensions are enabled, the memalias setting
is 40, and "enable pse=pse40" in the conf file. Memalias maximum
is now 40, instead of 32. Add code to provide that memory above
the 4GB address mark when PSE is in use by the guest OS. Added
dosbox.conf option to specify a memory file. When specified, all
guest memory is memory-mapped from a file on disk, rather than
allocated from host memory or host swap file. To avoid consuming
too much RAM on the host, a memory file is REQUIRED to emulate
memory at or above 4GB. For best performance with the memory file,
make sure the filesystem you place it on supports sparse files,
including Linux ext4 and Windows NTFS. (joncampbell123).
Fix EGA machine type to determine whether CGA RGBI or EGA RrGgBb
display is active by vsync polarity, instead of the length of
htotal. Several online references state that vsync is negative
for 350-line modes, including 350-line to an MDA monitor. This
also allows the "enhanced" EGA 320x200 modes in Rambo III to display
colors correctly. (joncampbell123).
Dynamic x86 core: Reflect STI instruction to normal core so that
the 1-instruction delay is correctly emulated. This makes it
possible to run Windows XP or Server 2003 with dynamic core and
SYSENTER/SYSEXIT emulation without random BSODs (joncampbell123).
Fix default code page. Instead of assuming 437 at all times, use
437 for all IBM PC compatible modes and 932 for PC-98 emulation.
(joncampbell123).
Normal core: Fix STI emulation to enforce the 1-instruction delay
by forcing the normal core to execute another instruction right
away without providing any opportunity for interrupt processing.
This does not break Peret Em Heru, Keen games, and it seems to fix
the random BSOD issues with Windows XP and Windows Server 2003
when emulating a Pentium II that supports SYSENTER/SYSEXIT. I'm
not clear on why this fix prevents them from crashing, but there
you go. (joncampbell123).
Keyboard emulation: Fix PCjr key delay to match IBM documentation
stating how long it takes to transmit one scan code, which is
obviously much slower than normal to accomodate the slow CPU and
the optical nature of the transmission. This is needed in order
for emulation to correctly send Fn+key combinations. At normal
key delay, the guest will miss scan codes and function keys will
not be reliable. (joncampbell123).
Keyboard emulation: The 83-keyboard scan codes work differently on
the PCjr keyboard because half of them are only accessible by holding
the Fn key. The keyboard only sends the base key scan code and the Fn
key scan code and the BIOS is expected to convert that to the normal
83-key scan codes expected by DOS software. The problem is some games
like "Agent USA" for PCjr are written to directly handle scan codes
through IRQ 1 (the fact that PCjr handles keyboard via NMI and reflects
to INT 9 is ignored here). Fix this by sending scan codes that emulate
holding Fn and pressing the appropriate key. Agent USA expects the
user to press F1 by holding Fn and pressing "1". (joncampbell123).
Revise VGA doublescan mode, vs bit 7 of the Max scanline register, to
correct how VGA doublescans 200-line modes. Revise EGA/VGA text code
to divide line by 2 in rendering to match double scanned scanlines,
so that the "graphical" text of "After the War" can render properly
for machine=vgaonly. (joncampbell123).
INT 10: If machine=ega, check the EGA switches on INT 10h modeset.
Some games force the EGA BIOS to use CGA 200-line text modes by
modifying those bits and then setting the mode ("After the War").
(joncampbell123).
INT 10: Fix "load font" functions to correctly recompute video
display end for machine=vgaonly and machine=ega. (joncampbell123).
INT 10: Like any other 200-line 16-color graphics mode, 200-line
VGA text mode needs to program the AC and VGA palette using the
CGA RGBI-type palette, not the EGA 64-color type palette. (joncampbell123).
CPU: Disallow clearing PE bit from LMSW by default, always.
You can still allow it through dosbox.conf. It turns out that
x86 CPUs never allowed you to clear it that way, even from the
Pentium up, even though Intel documentation beyond the 386 never
mentions it again. This fixes problems with DOS extenders and
VCPI, particularly DOS4GW which for some reason with VCPI likes
to try to clear the PE bit when switching to VM86 even though
it clearly understands it's not supposed to be able to clear it.
(joncampbell123).
VCPI: It turns out the VCPI server GDT selectors are expected to
be 32-bit, because the protected mode VCPI entry point is expected
to be called as if 32-bit far pointer. Correct VCPI entry point
to return using RETF, not IRETD, which solves crashing issues with
DOS extenders. For the first time, DOS extenders are working with
the DOSBox-X built-in implementation of VCPI and most DOS games
run fine now with it. (joncampbell123).
VCPI: Add code to INT 2Fh handler regarding Windows startup/shutdown
messages to fill in DS:SI. If EMM386 and VCPI emulation is active
and running the DOS machine in virtual 8086 mode, give Windows the
proper callback procedure to allow Windows to switch off VCPI vm86
mode on startup and turn it back on during shutdown. (joncampbell123).
BIOS "POST" screen: Change BIOS logo to PNG format. To avoid having
to render a PNG in roughly 10 different video modes, add code to
VGA draw code to allow a BIOS logo "overlay" to be rendered
independent of the video mode. Depending on machine type load one
of four PNG files from disk or from inside DOSBox-X itself.
PNG requirements: 224x224 or smaller, bit depth of 8bpp or less,
color palette (not grayscale), no alpha channel, and must not be
interlaced. For best compatibility, use less than 64 colors, or
perhaps just 16 colors. Much like the Windows 95 LOGO.SYS, you can
change the logo to your taste by placing specifically named PNG
files in the same directory as your dosbox.conf or current working
directory. Have fun. Note that this addition requires that you
compile DOSBox-X with libpng enabled. (joncampbell123).
Added dosbox.conf option to specify BIOS logo file. (joncampbell123).
Added dosbox.conf option to specify a text message, up to 3 lines,
at the bottom of the screen during BIOS POST screen. (joncampbell123).
Fix color glitches in EGA, Tandy, Hercules mode on macOS SDL2 build
(output=opengl)(maron2000)
Add int33 mickey threshold option (Fixes Ultima Underworld) (jpernst)
Fix configure.ac (disable-screenshot option) (maron2000)
Fixed codepage switching when loading language file in Traditional
Chinese (maron2000)
Fixed display of some Chinese characters (Traditional Chinese)(maron2000)
Fixed garbled text and menubar on reset (maron2000)
Fixed codepage switching when a language file was loaded (maron2000)

2024.12.04

Arrange memory device allocation so that it is possible to allocate
up to about 3900MB of memory instead of 3500MB. (joncampbell123).
Fix S3 LFB PCI base alignment error if system memory pushes it
to a higher address (joncampbell123).
Fix EGA 640x350 4-color mode (when EGA memory size is 64KB) to
display correctly. Prior to this fix, 640x350 4-color only worked
properly if the INT 10h Video Parameter Table was enabled. (joncampbell123).
Fix S3 VGA memory size reported through register CR36 to cap at 4MB
and set the value correctly. This fixes a known issue where setting
vmemsize to 8MB caused Windows 98 to report memory size as 2.5MB. (joncampbell123).
Fixed a problem when VZ Editor is resident in PC-98 mode. (nanshiki).
INT 10: SVGA mode 0x6A does not exist on plain VGA hardware. (joncampbell123).
INT 10: Fix mode 0x6A (800x600 4-color SVGA) to use a correct dot
clock so that the refresh rate is >= 60Hz instead of 37Hz, and make
sure mode 0x6A is a 100% clone of VESA BIOS MODE 0x102. (joncampbell123).
Fix MMX/SSE instruction decoding, correct some mistakes in MMX emulation. (joncampbell123).
IMGMAKE: Add -partofs option to allow control of where the partition
begins in the image (joncampbell123).
IMGMAKE: Add -align option so that the FAT filesystem can be arranged
for more optimal I/O on devices with larger sectors, such as modern
4096-byte/sector drives. (joncampbell123).
IMGMAKE: Add -label option so that the generated FAT filesystem has the
specified volume label. (joncampbell123).
MDA emulation: Fix non-blink attributes 0xF0 and 0xF8 to correctly render
bright green background. (joncampbell123).
Fixed crash when a CD image was loaded to an "empty" drive (maron2000)
Log loaded .conf file (maron2000)
Supress redundant screen reports in log (maron2000)
Fixed mouse capture locking by middle button (maron2000)
Fixed toggling the menu option "Autolock mouse" did nothing (maron2000)
Fixed build failure with libc++ 19 (DimitryAndric)
Fixed fullscreen mode not responding when launched in TTF mode
in Windows (maron2000)
Fixed crashes when changing floppies mounted by drive numbers on
a booted guest OS (maron2000)
Fixed launching host programs with white spaces in path (Windows)
(maron2000)
Convert paths from relative to absolute when launching host programs
in a mounted drive (Windows) (maron2000)
Added an option not to pause after host program execution is
completed (maron2000)
Fixed corrupted display when loading language files at launch
(maron2000)
Fixed Z Drive path expansion to be case insensitive (maron2000)

2024.10.01

Allow the ".inst" extension for CUE sheets. (Allofich)
Add SET /FIRST, a DOSBox-X extension, that takes the specified
variable if it exists and moves it to the front of the environment
block. (joncampbell123).
SET command processing has been cleaned up and streamlined.
Added /ERASE command line switch to clear the environment
block (DOSBox-X extension). (joncampbell123).
VESA BIOS: Add new option to adjust reported linear framebuffer
address by a specific number of pixels. This is needed by
"Out of Control" by Contract which for whatever reason,
will always draw to the LFB base minus 128 bytes. This option
makes it possible to correct the demo graphics. (joncampbell123).
Gravis Ultrasound: Officially, registers 0x0-0xF, the voice
control registers, are documented to have a 0x0-0xF write and
0x80-0x8F read alias. Unofficially, according to the behavior
of 1997 demo "Out of Control" by Contract, all GUS registers
have a N and (N+0x80) alias, or at least register 0x4C, and
you can read them back from either index. Or else the demo
fails to detect the GUS. So add this alias, but only if
enabled in dosbox.conf. Real hardware testing is required to
know if the actual GUS behaves this way and which versions.
(joncampbell123).
Move the INT 3 default vector to well within the initial 16
bytes of the DOS kernel, away from the List of Lists and SFT.
The previous placement caused certain versions of Windows 3.2
(yes, the Chinese version) to crash on startup. (joncampbell123).
When using the running program to name screenshots and such,
filter out all invalid characters so that Windows users can
take snapshots even if junk characters are there (joncampbell123).
DOS FAT driver: If INT 13h reports disk change, adapt floppy
disk geometry to new disk image according to media byte. This
allows DS_BLISS to present it's 720K fake floppy even if the
user initially mounted a 1.44MB floppy to drive A: (joncampbell123).
INT 10 mode list: Add "pitch" parameter. If nonzero, the value
(in pixels) is how to program the pixels per scanline when
setting the mode.
VESAMOED: Add -pitch option to control the pitch (pixels per
scanline). The intent is to work around DOS games that assume
nonstandard pixels per scanline by allowing the VESA BIOS mode
to use a different one. For example, Line Wars II has an S3
acceleration mode that uses 800x600, but for whatever reason,
assumes the video mode is 1024 pixels per scanline, and will
render garbled graphics if that is not the case. (joncampbell123).
S3 emulation: Follow S3 Trio64 documentation and mask the Linear
Window Position bits according to the size of the memory. You
can only place it on a multiple of the memory size. This silences
warnings caused by Line Wars II which appears to modify only the
upper byte but not the lower when modifying this register, which
then leaves 0xA0 in the lower half. That lower half would be
ignored for 1MB or larger video memory sizes. (joncampbell123).
S3 XGA emulation: Add XGA acceleration for 4bpp packed 16-color
SVGA modes. A CAD package has S3 support drivers that use the
16-color 4bpp packed modes and expects XGA acceleration to work.
(joncampbell123).
Add "-o int13" option to IMGMOUNT to direct the FAT driver to do
all disk I/O through INT 13h instead of directly. This is intended
for certain demoscene productions that apparently like to make
files appear out of thin air by intercepting INT 13h floppy disk
I/O and then asking MS-DOS to run something from it. Hack for
"DS_BLISS" demo. (joncampbell123).
Fixed crash when a language file is loaded on a Windows host with
US keyboard (maron2000)
Added Added sharp-bilinear Direct3D shader (RibShark)
Pass output dimensions to Direct3D shaders (RibShark)
Fixed BPB of floppy images made by IMGMAKE command (maron2000)
Fixed timestamp of volume label changed by LABEL command (maron2000)
Fixed pathname issues when mounting differencial VHD images (maxpat78)
Corrected relative/absolute track offset in subchannel data for
CD-ROM images (RibShark).
Fixed particular dead keys were not working to input characters
with diacritics (maron2000).
Enabled "Edit and Continue" option for debug builds of Visual Studio
Intel builds (aybe).
Updated libchdr to latest (treloret).
Fixed icon in Gnome dock bar (FredBezies).
add option "[dos] automount drive directories" for Windows builds,
this will mount existing drive directories from C to Y drive (aybe).
fix off-center and off-screen window after entering the
configuration tool while using TTF output mode (aybe).
add menu item for centering window "Video/Center window" (aybe).
Fixed update-version-number script to patch all *.iss files, not
just the specific one it did before, to ensure future releases have
correct version numbers. (joncampbell123).
Updated Nuked-OPL3 code to nukeykt/Nuked-OPL3@cfedb09 (StevenSYS)
Updated SDL2 library to 2.30.4 (maron2000)
Fixed TTF mode didn't change to graphic mode when machine = Hercules
(maron2000)
Configuration tool: (aybe)
- more Windows 3.1 look'n'feel (themes w/ host dark mode detection)
- enhance main window layout, it is now visible in its entirety
- fix layout issues, off by one in rectangle drawing functions
- fix 'list iterators incompatible' when pressing the Tab key
- properties/help: sorted alphabetically, mouse wheel scrollable
- remove few rendundant labels, adjust names of some others
- retain 'show advanced options' state throughout session
SVN r4483: Fix compilation in Visual Studio 2008 (Allofich)
DOSBox Staging: Decouple CMS and OPL emulations (Allofich)

2024.07.01

Correct Hercules InColor memory emulation. Read and write planar
behavior was incorrect due to a misunderstanding of available
documentation. (joncampbell123).
Hercules/MDA and InColor integration broke the Hercules blend mode
render, fix the render so that adjacent lit pixels are brighter
again. (joncampbell123).
Fix "VRD" debugger command bug that didn't properly render out the
rest of the VGA display frame. (joncampbell123).
Fixed debugger mapper shortcut bug where entering the debugger
completes the 1 ms "tick" early, effectively jumping emulator time
up to start of the next ms. This might explain the mysterious cases
where a program always fails to work unless you are debugging it.
(joncampbell123).
Added debugger command "VRT" which resumes running the guest until
vertical retrace. Added for programmers who wish to write something
to screen and then see it show up. (joncampbell123).
Fix IMGMOUNT, when mounting FAT disk images, to provide the DPB the
actual media id byte instead of assuming 0xF8 or 0xF0. INT AH=1Ch
should now report the proper media id byte for any floppy format,
instead of always reporting 0xF0 (1.44MB floppy). (joncampbell123).
Allow BOOT to load and execute the boot sector of a guest OS even if
memory size is too small (in IBM PC emulation, less than 32KB of RAM).
MS-DOS 1.x of course will crash if you try that because of the
assumptions made in the boot sector, but it's there if you are feeling
adventurous or are in an experimental mood (joncampbell123).
If memsize is 4KB, place the COMMAND.COM PSP segment in the private
UMB area instead of the normal MCB allocation chain (joncampbell123).
DOS kernel will always allocate kernel memory from private UMB area
if memory size < 16KB, in order to continue to work (joncampbell123).
DOS kernel will allocate from segment 0x60 instead of 0x70 if the
memory size is less than 64KB. (joncampbell123).
files= and fcbs= default value now automatically scales according to
available conventional memory (640KB or lower) in order for memsize 64KB
or lower to free up or memory and run properly. (joncampbell123).
dosbox.conf files= and fcbs= settings have been changed to allow
"0" as a value to mean choose a reasonable default. (joncampbell123).
Fix bug where DOS kernel crashes on startup because of the initial
stack pointer set by BIOS startup that points past available memory
when memsize is 64KB or less. (joncampbell123).
If minimum mcb free is not set and memory size is less than 256KB,
automatically set minimum mcb free to minimum mcb segment, in order
to release more available memory within the limited space (joncampbell123).
Do not enable XMS emulation if system memory size is 1MB or less. (joncampbell123)
DOS drive cache: When listing a directory, defer the filename sort until
the entire list is built. This improves directory listing performance
in directories with many files. (joncampbell123).
INT 10h, if instructed, will now use the video parameter table to set
standard VGA modes instead of internal logic. (joncampbell123).
Removed erroneous VGA display compensation code for certain EGA/VGA
registers that really only caused incorrect display of the EGA 640x350
4-color mode. (joncampbell123).
Corrected EGA and VGA video parameter tables by copying the parameters
from actual IBM EGA VGA ROM BIOS images. They should be 100% correct
now. (joncampbell123).
Corrected register values and video rendering of machine=EGA 640x350
mode when emulating 64KB of RAM. This should fix rendering and display
issues with EGA 640x350 4-color emulation. Also corrected INT 10h
character printing functions to filter the color attribute value for
640x350 4-color mode so the DOS prompt does not have alternating
colors, in the same manner the real IBM EGA BIOS does. (joncampbell123).
Fix BIOS screen to use CGA 640x200 2-color mode if machine=ega with
less than 128KB of video ram, or machine=ega200, instead of showing
a garbled 640x350 display. (joncampbell123).
Fix memory buffer overrun with machine=ega that can occur with
640x350 mode and less than 256KB of video RAM. (joncampbell123).
The DOSBox clipboard API (via INT 2Fh) is now disabled by default, because
some programs use it's presence to detect whether they are running under
Windows. This fixes a program where Norton Desktop 1.0 does not use it's
"graphical" text UI elements because it thinks it's running within a
Windows DOS box. (joncampbell123).
Remove unnecessary and useless Win32 fcntl() on some memory typecast
to int which is causing a segfault whenever a ZIP file is mounted
as a drive with an overlay filesystem atop it. (joncampbell123)
Update caption control feature to use equivalent APIs on Mac OS. (joncampbell123)
Add dosbox.conf and menu option to control whether the DOSBox-X window
can be seen in screen captures in Windows 7/8/10/11. Windows 11 "Recall"
is very concerning and users might not want their DOS gaming to be
part of it's memory. (joncampbell123).
Correct EGA switch readback from port 3C2h to reflect a value of 0x8
instead of 0x9 when machine=ega200 (joncampbell123).
Correct BIOS data area value that holds the "EGA switches" to reflect
200-line EGA "emulation" when machine=ega200. Value 0x08 instead of 0x09
(joncampbell123).
Correct mode parameters for CGA 640x200 2-color mode when using
machine=ega200 so that it displays correctly. (joncampbell123)
DOS kernel: Remove fixed hacks for SFT and dynamically allocate the
second SFT table for the last N - 5 file handles. Add code to zero
SFT table memory to ensure that random data doesn't cause issues.
Windows 3.1 is still perfectly fine with it, so the SFT table update
and cleanup is complete. (joncampbell123).
DOS kernel: Move the magic "CON" strings into the first SFT and
mimic the 5 default open file handles that every DOS process starts
with: CON CON CON AUX PRN. Windows 3.1 is still happy with it, which
is good. (joncampbell123).
DOS kernel: Put the CON driver somewhere else because allowing it
to overlap the SFT is messy. Fix SFT generation to match the way that
MS-DOS 5.0 does it where the first table is always 5 entries and the
second table is always N - 5 entries. Cleanup the DOS memory allocation
a bit. So far, Windows 3.1 doesn't have a problem with it. (joncampbell123).
DOS kernel: Interrupt handler IRET was accidentally placed within
the SFT table, move it up to resolve the conflict. (joncampbell123).
Local DOS drive support: On Windows, if the guest is attempting to
create a hidden file, make sure to call the right APIs to create a
hidden file on the host. Not only is this needed to create a hidden
file, but if the guest tries to create a hidden file and the file
already exists as a hidden file, the file creation needs to succeed.
Fix for "Facts of Life" by Witan because the demo creates a hidden
WITAN.92 every time it is run (joncampbell123).
XMS: Add dosbox.conf option to XMS driver to switch on flat real mode
when a) the XMS driver initializes and/or b) when the XMS driver is
called on to move/copy memory. (joncampbell123).
INT 21h: If a DOS program frees a memory block, and then resizes the
freed memory block, reassign ownership of that block to the program
as if allocated. This is apparently canonical MS-DOS behavior. Added
dosbox.conf option to control whether resizing a freed block silently
assigns ownership (default setting) or whether it returns an error.
DOS resize memory function for the most part DID assign ownership but
not in the case where the size of the MCB was exactly the size requested
to resize to. (joncampbell123).
Sound Blaster: Fix bug where "force autoinit" prevented Sound Blaster
playback from working at all, fix for "Jump" by Public NMI (joncampbell123).
Debugger UI now shows PIC_FullIndex() and whether or not the CPU is
in the HLT state. Single stepping does not do anything when the CPU is
in the HLT state, so at least let the user know (joncampbell123).
Keyboard controller (IBM PC): Cancel the IRQ signal upon reading I/O
port 60h. The reason for the IRQ, the pending data, was just read, so
now there is no point in keeping the IRQ signal up. This fixes Escape
key problems with "Cronologia" by Cascada that causes part 3 "Time"
to immediately exit and continue to the credits. Part 1 and 2 are not
affected by the pending IRQ because those parts mask IRQ 1 and poll
the keyboard controller directly. (joncampbell123).
Fix complexity test code to determine when Odd/Even mode is enabled
in all cases and to resolve a problem with garbled scrolling text
in the "Vectorballs" part of "Unreal" (joncampbell123).
M_EGA display mode now applies CRTC BYTE/WORD/DWORD shift to display
start address, same as M_VGA, to ensure correct display when demos
and games set the CRTC to non-BYTE modes. This fixes page flipping
flickering during the "Vectorballs" part of "Unreal" by Future Crew.
(joncampbell123).
Update Configuration GUI to use radio buttons for selection, meaning the
circular buttons that resemble those in Windows, not the check boxes.
The GUI toolkit had them all along, the Configuration GUI was using
check boxes for that for some reason. (joncampbell123).
Linux ALSA MIDI output: Any attempt to send RESET or other Fx commands
to the ALSA library causes a segfault in the ALSA library. Revise the
code to send without crashing. (joncampbell123).
Linux ALSA MIDI output: Add code to list and enumerate the MIDI sequencer
devices available so the user can use it to determine what magic numbers
to put into the midiconfig setting, especially if the user wants to send
MIDI to an external synthesizer. (joncampbell123).
Suddenly Mac OS 14 and XCode consider the "id" and "int" datatypes
different and assigning or returning one to the other is now a compiler
error. Add typecast to enable compile on latest XCode. (joncampbell123)
INT 33 mouse emulation: Add dosbox.conf options to force a specific
coordinate system for the DOS game with respect to host/guest mouse
cursor integration (getting the DOS cursor to match the host cursor
within the window). Add dosbox.conf option where additional adjustments
are available. The maximum x/y and max-adjust options are ideal for
Lemmings 2, which uses INT 33h in a way that confuses the automatic
range detection code used to synchronize cursor position and therefore
needs this option, and the first Lemmings as well. (joncampbell123).
PIT timer: Fix restart_counter(), the delay computation was completely
backwards. This is particularly important where it concerns programs
that use the PIT to detect the rate at which the Pentium time stamp
(RDTSC) advances as the previous code caused wildly inaccurate measurements
and bad timing (GRUB bootloader, the Microsoft CD-ROM boot "press a key
to boot from CD" message). (joncampbell123).
IDE: Make sure to set feature/error register to 0x01 when the guest
soft or hard resets the IDE devices through the controller. The Linux
kernel uses a soft/hard reset on startup to detect PATA devices and
if it does not see the correct value after reset, it will either ignore
the device or complain about diagnostic failure and cautiously talk to
the primary IDE hard drive while ignoring any ATAPI CD-ROM emulation.
This allows the Linux kernel to boot and see the CD-ROM drive. (joncampbell123).
IDE: Do not clear registers unnecessarily when finishing IDENTIFY DEVICE.
The BOOT command now supports El Torito "no emulation" booting from a
CD-ROM drive, which is needed to boot install CDs for Windows XP, Linux,
etc. or Linux-based live CDs. Note that at this time, BOOT only supports
"no emulation" and IMGMOUNT only supports "floppy emulation" (joncampbell123).
INT 13h extensions: If a read was interrupted by an error, update the
block transfer count so the caller knows (joncampbell123).
DOS: Move version parsing farther up, so that the initial DOS version
can affect memory layout and tables as needed. (joncampbell123)
DOS DPB and FAT driver: If the DOS version is 4.0 or higher, write a
DOS 4.0+ compatible DPB structure (as DOSBox-X already has been doing
since forking from DOSBox). If the DOS version is lower than 4.0,
write an MS-DOS 3.30 compatible DPB structure. This allows Popful Mail
to run without getting into an infinite loop scanning the DPB linked list
when [dos] section ver=3 30 (MS-DOS 3.30), aside from the fact that the
game will also run without this change if you set ver=4 0 since the game
appears to be aware of the change in structure between MS-DOS 3.30 and
MS-DOS 4.0, though for whatever reason the game refuses to run on
MS-DOS 5.0 or higher. (joncampbell123).
IDE: Silently ignore SET FEATURES command 0x03. Any negative response
to feature 0x03 causes the Linux kernel to reject the IDE device.
(joncampbell123)
Add support for PIT timer 0 mode 4. Linux kernel 6.1.29 compiled in
"tickless" mode uses mode 4 instead of mode 0 as a delay timeout. Prior
to this fix, the Linux kernel would switch into tickless mode and then
nothing would happen because IRQ 0 would never fire again. See also Linux
kernel source code, drivers/clocksource/i8253.c function pit_set_oneshot()
to see what I mean. (joncampbell123)
Windows 95 S3 driver behavior suggests that S3 16-color VESA modes
0x202 to 0x208 are NOT planar modes, but packed modes. Change modes to
M_PACKED4 and update modelist building to allow that range even if the
dosbox.conf is configured not to list 4bpp packed VESA modes. This fixes
Windows 95 S3 driver 16-color modes 800x600, 1024x768, 1280x1024.
Noted: Windows 95 is the last version of Windows to support 4bpp packed.
Windows 98 and higher refuses to support it and the Display settings
will not allow you to select any 16-color mode other than the stock
VGA 640x480 16-color planar mode. (joncampbell123)
Add --load-seg option to BOOT in case any PC-98 game boot floppy expects
to be loaded somewhere other than the default. PC-98 game "Private School
Adventure" will crash if loaded to segment 0x1FC0 but runs fine if booted
with --load-seg 0x0FC0 instead. (joncampbell123)
Add dosbox.conf option to direct the EMS page frame segment, in a limited
fashion, though only effective for PC-98 mode. PC-98 segment is still
0xD000 by default, but apparently there are games that require the EMS
page frame to exist at 0xC000. For these games, you can now set under the
[dos] section "ems frame=C000". (joncampbell123)
Restored libslirp support for 32-bit MinGW CI builds which was temporarily
dropped in 2024.03.01 release. Also since MinGW plans to gradually phase
out 32-bit support, added code to manually build on our own. (maron2000)
Fixed build errors of Windows installers. Windows Vista support for standard
installer is dropped to fix this issue. Vista users can either use the XP
installer or portable builds instead. (maron2000)
Fixed compile error of speexdsp/fftwrap.c on gcc-14 (maron2000)
PC-98: Fixed US keyboard support for tilde (Shift+grave) key (maron2000)
Fixed DOSBox-X freezed when codepages regarding EGA18.CPX were set (maron2000)
Fixed CUE sheets of GOG games were rejected. Still requires "-t iso" or
"-t cdrom" option for uncommon file extensions except ".CUE". (maron2000)
Added loongarch64 support (donmor)
Disable FP exceptions in a portable way (xry111, donmor)
Added "*.ccd" in file open dialog (maron2000)
Added CI builds for ARM mac (maron2000)
Bump tinyfiledialogs to ver 3.17.4 (maron2000)
Obtain geometry info of non-standard sized floppy from BPB (maron2000)
PC-98: Implemented int 18h ah=47h,48h,49h (nanshiki)
Added breakpoint type "Freeze memory" (Enmet)
Implemented seeking in MSCDEX
(Imported from dosbox-staging/dosbox-staging#3516 authored by weirddan455)
Fixed built-in COPY command failed to obtain free space when reported DOS
version is set to 7.1 (maron2000)
Fixed some file extensions in the filter list were ignored in the file open
dialogs (maron2000)
Fixed mounting a non-FAT VHD image (maxpat78)
Fixed VHD geometry detection (maxpat78)
Fixed issue that IMGSWAP command did not work for CD drives. (maron2000)
Fixed loaded language file unexpectedly changes on launch. (maron2000)
Fixed reported size issues in builtin DIR command (maxpat78)
Added missing language file in Windows standard & XP installers. (maron2000)
Fixed a bug in IME character display on macOS Sonoma (nanshiki)
Fixed build errors of SDL1 code when built with gcc-14 (maron2000)
Fixed static link errors of libslirp >= 4.8.0 (maron2000)
PC-98: Added MEM command for PC-98 mode (maron2000)

2024.03.01

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...

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).

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)

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.

Auteur(s)

joncampbell123

Changelog

2025.02.01

2025.01.01

2024.12.04

2024.10.01

2024.07.01

2024.03.01

2023.10.06

2023.09.01

2023.05.01

Auteur(s)

Autres émulateurs de la catégorie

Provenance

iDOS

DosBox Staging

Boxer (fork)

DOSBox

Boxer