DOSBox Changelog

What's new in DOSBox 0.74-3

Dec 24, 2020

Implement basic file access control for files available from within the emulation, so that programs running inside DOSBox can't access /proc (e.g. /proc/self/mem). (CVE-2019-12594)
Unify unmounting code and add some protections against out of bound access when DOS_DRIVES is not 26.
Use correct type for return value of strlen.
Change scan3x to a bit brighter.
Fix unitialized access to some isoDrive fields and improve stability when switching CD images.
Small fix to hq3x.
Fix 256 colour mode encoding in zmbv.dll.
Some small aliassing fix.
Change SET to check the size of the MCB when adding variables. Fixes hangs with Norton Commander.
Check buffer length before doing tab completion.
Correct buffer overflow with very long lines in bat files. (CVE-2019-7165)
Correct the boundary check for the internal programs array.
Increase stability in max cycles mode by increasing the lower bound.
Fix command prompt in windows 3.11 with dynrec core.
Fix Win64 dynrec core.
Always clear buffers before drawing in OpenGL mode. Fixes artifacts with drivers that have more than 2 buffers and overlays.
Fix red border that appeared when scaling the image in OpenGL mode with Nvidia on Linux and Mac.
Change default output to opengl on Mac, as surface is very slow there in 64 bit.
Add workaround for the mouse unlocking problem with X.org 1.20.1.
Fix table access when USE_FULL_TLB is undefined (non-default configuration).
Several fixes to prevent compilation errors.
Update Visual studio file to fix missing files from 0.74-2.

New in DOSBox 0.74-2 (Dec 24, 2020)

Rewrite auto/max cycles algorithm to work better with windows 7, other OSes might benefit as well.
Update 64bit recompiler to work on OSX and Linux.
Several improvements to make the recompilers work with newer compilers and add some workarounds about clang confusing itself.
Fix several variables being the wrong size in the recompiler.
Support absolute 64 bit addressing. (DRC:64 bit error messages)
Zero extend data in dynrec core for LLVM compilation/
Reduce overhead of the Mac version with a lot. Results in a speed increase.
Replace NV_PixelDataRange with the more common ARB_PixelBufferObject extension. Should help with output=opengl.
Reuse graphics window if possible instead of always creating a new one!
Add patches to work better when called by WINE
support WINE style namemangling.
allow Z: to be moved to a different drive.
Try to fix stuttering audio with opengl output on Linux. (or at least improve it. Linux users might need to increase the prebuffer option a bit)
Fix automake and autoconf problems.
Fix problems related to packed struct layouts.
Fix compilation on gcc 4.4 and gcc 4.6.1.
Fix compilation with -DPIC.
Hopefully fix crash on shutdown, when unknown condition is encountered.
Fix -lto with gcc.
Fix clang compliation with asm fpu core.
Fix mapper crash on startup and when changing the mapper key.
Fix compilation in VS2015.
Fix compilation on mingw64.
Fix compilation on Frisbee and newer clang.
Fix compilation machines that have X11 libraries installed, but use a SDL without X11.
Fix a few problems relating to video capturing
Writing out the index too often. (slowdown with longer captures)
Not being aware of when only the refresh rate changed.
Fix call order when bitshifting the return order (VS C /O2 builds).
Fix sign-extension error in S3 draw funcion, i.e. win3.1 analog clock.
Fix expanddot not caring about the size of the inputbuffer.
Some fixes for the debugger related to starting a program through debug.com.
Bring OS/2 port code up to date.
Reduce the amount of warning when compiling with quite a bit.
Allow 15/26/32 bits input to the opengl output.
Add cmd-q as exit key for macs.
Fix icon and titlebar on very old setups.
Fix off by one display size calculation errors with very large displays.
Fix out of bounds access the unused byte in the 32 bit colour value of the hardware mouse cursor pixel was affected.
Fix depreciated warnings on Mac, allow soundfont loading for coreaudio.
Keep repeating a pressed key if another key was unpressed.
Fix crash on OS X related to putting junk in the titlebar.
Extend fullresolution=0x0 to work on Linux and Mac.
Change gameblaster and tandy sound core to latest mame version.
Improve numlock and capslock support on Linux and Macs. Still not perfect on Windows.
Added even more code to workaround Windows behaving weirdly with alt-tab.

New in DOSBox 0.74.1 (Sep 11, 2012)

New in DOSBox 0.74 (May 12, 2010)

Several small game specific fixes/hacks/support. (Offensive, Roadhog, GTA installer, Kingdom O' Magic soundcard detection, Pirate booter, Armored Fist installer)
Add the S3-specific 640x480 256 color mode. (fixes regression in "Wooden Ships and Iron Men" and "I Have No Mouth And I Must Scream")
Fix a stack overflow that could crash DOSBox.
Add fake microphone input. (fixes Talking Parrot)
Modify adlib turn off code, so that it doesn't turn off in cases where the same sound is repeated over and over again.
Several small fixes to the CDROM audio code. (HOMM2, Redneck Rampage and others)
Several improvements to the CDROM emulation code. (fixes Alpha Storm and GT Racing 97)
Some small CPU fixes that might fix something.
Handle opcode 0xff subcode 7 as invalid instruction. (fixes dif-2 & others)
Some hercules fixes. (Testdrive)
Improve support for blanked parts that wrap around to the start of the screen. (fixes Magic Circle demo and Sid&Al)
Remove old OPL cores as the new ones seem to work very nicely.
Modify movie recording code so that the movies aren't corrupt when you exit dosbox without stopping the movie.
Change RGB3x scaler to look more pretty.
Improve initial register values compatility of the GUS.
Added autodetection for Gameblaster. (games can find it now)
Change render preferences a bit to be more compatible with Windows 7.
Add DOS fixes to terminate program. (fixes Fortune Teller)
Add FFREEP. (fixes Trucks)
Improve FPU ST80 in C mode when writing zero. (fixes Antigok)
Add special int10 scanline function. (fixes mz700 and probably lots of games that mess with them)
Fix scrolling in rarely used video modes. (fixes Orphee)
Modify game specific hacks a bit so that Kick off 3 works again.
Lots of fixes to the INT10 video parameter table. (Seven spirits of ra and others)
Add VGA blanking in machine=vgaonly. (used by Alien Carnage)
CGA, PCJr, Tandy: Add video blanking, change display start latch timing, sync pulse width correction.
PCJr, Tandy: implement vertical retrace interrupt.
PCJr, CGA: line-by-line video emulation.
PCJr: support on-screen change of color modes 4medium to 16low. (used by Ghostbusters booter)
Hercules: Add green and amber monochrome support.
All machines: only update the video timing when needed. (Jungle Hunt, others that synchronize to the video screen might profit)
Several small DOS fixes.
Some UMB related fixes. (The Legacy without UMB)
Fix version number of DSP for SB 1.5. (fixes a few games)
Several VGA emulation improvements. (Allertone football manager)
Some Tandy fixes. (Mech Warrior)
Small improvements and fixes to the OPL emulation.
Add low level Tandy DAC emulation.
Some EMS fixes. (fixes Mortal Kombat and others)
Change SoundBlaster DSP reset mechanism, add sb irq acknowledge logic. (fixes stmik-based applications)
Some interrupt pointer location modifications. (fixes Tinker Tales)
Some fixes to the BOOT code. (fixes Last Mission)
Respect write-only file information. (fixes Champions of Zulala)
Some RTC fix. (fixes Tully Bodine and others)
Improve mouse emulation to work better with Water World.
Hopefully fix the translation of the configuration file.
Speed up and fixes for the recompiler core. (pitfall2 pcjr)
Change memory start location. (fixes 7th Guest installer)
Several fixes to the batch file handling. (Shift and use the typed first %0 instead of the parsed %0)
Improve file redirection and redirected line ends. (fixes Phantasmagoria 2 DOS installer)
Fix compilation with new MAC os X version.
Add 16C550A FIFO support to the serial port emulation.
Improve modem emulation to get higher speeds.
Change default samplerates to 44100, blocksize to 1024 and prebuffer to 20, so that hopefully certain soundcards produce more fluent sound playback.
Add some rarely used, but for some games critical flags to the internal commands.
Add -userconf flag, so that the userspecific configuration can easily be used together with -conf configfile.
Improve internal timing with repeating timers (especially with the dynamic core).

New in DOSBox 0.73 (May 28, 2009)

Add two new opl2+opl3 emulators. (better speed, different implementation approach)
Improved DRO recording/better file structure.
Add EGA emulation.
Add special vga machine mode. Supports more of the exotic tricks like changing the palette during screen updates, 9x16 fonts etc.
Added special machine modes for the following svga cards:S3ParadiseTseng
Fix problems with the vga split line feature.
Improve vesa emulation.
Add optional selection of old vesa mode for games that don't work with certain vesa features.
Improve video BIOS emulation to behave more like a real bios.
Fixes for emulated 4bpp graphics modes.
Fixes to paging system.
Various fixes and improvements for the recompiling core.
Add arm backend for the recompiling core.
Add some mscdex quirks when dealing with files that are exactly 8.3 long.
Small fixes to batch file handling.
Small fixes to the XMS memory handling.
Various fixes for aligned memory on hosts that want it.
Various improvements to the mouse.
Fixes and small speed ups to the debugger.
Fix and improve lot's of compilation problems. (curses detection, GCC 3.4 and GCC 4.X fixes)
Added some basic auto keyboard layout handling. (windows only currently)
Add basic support for evdev keyboard driver.
Various fixes to the timer. (improve mode 2 timer changes, implement mode 1, improve gate2 handling)
Add audio extraction and mci audio support. Should enable CDROM audio for Vista and adds volume control.
Improve the directory cache speed a lot, especially with mounting slow media like network paths.
Various fixes to the create temporary file call.
Don't keep batchfiles open during execution. Allows rewriting of the active batchfile. (menu programs use this trick sometimes)
Fix problems with filenames with 2 extensions.
Add some more lowlevel dos tables.
Fixes to hercules emulation.
Fix flag handling for special case of ROR.
Make the batchfile handling in regard to IF more flexible.
Fixes to scrolling/panning feature.
Add prefetch queue emulation.
Make the emulated cpu type selectable. This is mainly the identification commands and the way paging works.
Some special EMS functionality added. (OS handles, zero-page handling)
Improve support for EMS when booting a different OS.
Improve cdrom speed detection by games.
Improve stability of cycle guessing code, when there is background activity.
Fix various mscdex and cdrom detection schemes.
Added Coremidi support on Mac OS X.
Improve support for DOS devices when used to detect the existance of directories in various ways.
Add IRQ 2 emulation on VRET. (ega only)
Added video parameter table and video state functionality.
Increase default freespace to 250 MB.
Some fixes to the fat filesystem handling for disk images.
Some soundblaster fixes and command additions.
Fix mixer 16bit direct transfers on bigendian hosts.

New in DOSBox 0.72 (Dec 8, 2008)

New in DOSBox 0.71 (Dec 8, 2008)

Add a new recompiling cpu core, which should be easier to port.
Add 64 bit version of the recompiling core.
Add mipsel 32 bit version of the recompiling core.
Fix a few small problems with FCBs. (fixes Jewels of darkness and cyrus chess)
Raise some more exceptions. (fixes vbdos)
Fix a few problems with the dynamic core. (fixes Inner Words, Archmimedean Dynasty and others)
Improve/Fix fallback code for certain graphics cards.
Fix a few cd audio related bugs.
Add an undocumented MSCDEX feature. (Fixes Ultimate Domain)
Fix some pcspeaker mode. (fixes Test Drive and similar games)
Improve dos keyinput handling. (fixes Wing Commander 3 exit dialog)
Remove Exit condition on fully nested mode. (fixes some demo)
Add image file size detection.
Add/Fix some ansi codes. (fixes PC Larn and certain versions of infocom games)
Several general DOS fixes. (fixes nba95, hexit and various other games)
Add some valid input checks. (fixes 3d body adventure and similar games)
Fix digital joystick centering problem.
Reenable textmode 54 and 55.
Fix a pelmask problem with univbe 5.0 lite. (fixes Panzer General)
Fix minor mixer underflow.
Some general image and bios disk emulation fixes.
Hopefully fix compilation on BSD and darwin.
Try using ioctl cdrom access by default if possible.
Fix some svga detection routine. (fixes Grandest Fleet 2 and Bobby Fischer Teaches Chess)
You can now close DOSBox using the status window in win32.
Add support for NX enabled systems.
Fix a casting error which only showed with certain compilers. (fixes various games under mac os x and 64 bit linux)
Improve timer and add gate 2 support. (fixes various games and joystick problems)
Improve mouse. Add undocumented backdoor. (fixes Last half of Darkness, PC-BLOX and others)
Add/improve support for ~ and ~username in all commands.
Fix a font problem with the pcjr/tandy. (fixes personal deskmate 2)
Change dma routine a bit. (fixes ticks in sound in various games)
Allow read-only diskimages to be booted. (fixes various booter games)
Add basic hidden file support on cdrom images. (fixes Player Manager 2)
Add some rarely used functionality to the int10 mode setup. (fixes WW2 Battles of the South pacific)
Add ability to force scaler usage.
Speed up flag generation and make it more 386-like.
Some colourful feedback in the mapper.
General code cleanup.