Cross-platform DOS emulation package
Complete, accurate emulation and more

DOSBox-X 0.83.12 Release Notes

Release Date: April 1, 2021

Please report any issues in our issue tracker.

Also, make sure to check out our Wiki guide.

New in This Version

  • CD-ROM image emulation now supports ISO images that are 2GB or larger, 32-bit integer size limit has been lifted.
  • Added scrollbar buttons to the Configuration Tool, so that the scrollbars better resemble the style of the Windows 3.1 scrollbars.
  • The help window for the Configuration Tool will now display possible and default values for the config options in addition to the descriptions. (Wengier)
  • Updated the MMX patch code by kekko. (Wengier)
  • Improved the compatibility of AUTOTYPE command with games like Asterix & Obelix. (Wengier)
  • MIXER command now supports the /GUI option to show a popup window to display the mixer information. Also improved its /LISTMIDI option which will show the name of the current MIDI handler and you can optionally specify a MIDI handler name (win32/alsa) to show the information for this handler. (Wengier)
  • Tandy graphics emulation fixed to accept 8 bits for vertical total and vertical display CRTC registers, which is needed for the tweaked graphics mode used by Math Rabbit to display correctly.
  • INT 10h will no longer fill in three fields in the BIOS data area (video CTL, char height, and video switches) unless the machine type is EGA or VGA. Those fields do not exist otherwise. Certain games like Mindscape’s “Road Runner” game require those fields to be zero as part of it’s Tandy detection routine.
  • PCjr mode will omit the reserved graphics RAM MCB block, and will subtract 16KB from the top at the BIOS level, if emulating 128KB system memory or less.
  • You can now run PCjr mode with as little as 128KB of RAM. Removed 256KB minimum check from DOS kernel. Certain games (Mickey’s Space Adventure) require memsizekb=128 and memsize=0 in PCjr mode or else it will not work correctly due to how the game locates video system memory.
  • Fixed Tandy mode to place video memory at the top of conventional memory and allow running Tandy mode with a memsizekb setting as low as 64KB, though 256KB or higher is recommended.
  • Added Tandy “real memory size” field in the BIOS data area.
  • Tandy emulation updated to subtract 16KB from top of conventional memory, which fixes some games and follows DOSBox SVN behavior and real hardware according to others on the Vogons forums.
  • Fixed bug that limited Tandy mode to 624KB of conventional memory. 32KB of video RAM is taken from top of memory, losing half of the 32KB breaks games that write to the system RAM instead of B800:0000 segment and causes half the graphics to not render.
  • Increased upper limit of “prebuffer” config option (in [mixer] section) from 100 to 250. It is still recommended to set a value less than 100. (Wengier)
  • The config options ttf.wpbg, ttf.bold, ttf.italic, ttf.underline, ttf.strikeout, and ttf.char512 can now be modified dynamically with CONFIG -SET … commands, e.g. CONFIG -SET ttf.wpbg=2. (Wengier)
  • The minimal value for the ttf.ptsize config option has been decreased from 10 to 9. (Wengier)
  • Added menu item “Save logging as…” (under “Help” -> “Debugging options”) to save the current logging content to the specified file. (Wengier)
  • Added slirp backend support for the NE2000 network feature (in addition to the existing pcap backend). There are config sections named [ethernet, slirp] and [ethernet, pcap] now to set the options for the slirp and pcap backends respectively. Please refer to the networking guide in the DOSBox-X Wiki for more information about the backends. (Jookia)
  • FAT driver can now support PC-98 HDI images with partitions that start at any physical sector even if the start is not a multiple of the ratio of logical to physical sector size. This allows the HDI image of Dragon Knight 4 to mount.
  • Control character 7 (BEEP) is now allowed while executing batch files without warnings. (Wengier)
  • With the setting “core=auto” DOSBox-X now updates the menu in the “CPU core” menu group automatically between “Normal core” and “Dynamic core” to reflect the CPU core which is currently in use. (Wengier)
  • Fixed Windows 95/98 installation failures caused by FAT driver and DOS API changes in previous version.
  • Fixed well-intended but erroneous fall through case in the INT15 handler that prevented 3rd party mouse drivers from detecting the PS/2 mouse.
  • Fixed the color issue with the Configuration Tool in the macOS SDL1 build. (ant_222)
  • Fixed switching ttf.cols, ttf.lins, and ttf.font options dynamically in full-screen mode. (Wengier)
  • Fixed menu options “Increase TTF font size” and “Decrease TTF font size” (both under “Video” => “TTF options”) not working (but keyboard shortcuts and those in the system menu work). (Wengier)
  • Fixed setting option “ttf.wp=xy3” or “ttf.wp=xy4” not working (but “ttf.wp=xy” did work). (Wengier)
  • Fixed preview function in WordStar not working for TrueType font output in previous version. (Wengier)
  • Fixed the issue that caused Windows 3.x group file corruption on hard disk image files. (SnikoLoft)
  • Integrated SVN commits (Allofich)
    • r4416: Added ability to start and stop avi recording, and to start keymapper, from config.
    • r4405: Smarter clearing of the dynrec cache.
Previous release: 0.83.11 (release notes) Next release: 0.83.13 (release notes)