OpenDUNE/README.atari at master · OpenDUNE/OpenDUNE · GitHub

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To get OpenDUNE running on Atari ST/STE, TT or Falcon:


* Building

cross compile using cross mint and vasm (vasmm68k_mot):
http://vincent.riviere.free.fr/soft/m68k-atari-mint/
http://sun.hasenbraten.de/vasm/

or download a pre-configured toolchain from:
https://github.com/sidecartridge/atarist-toolkit-docker


for the default 68030 version use :

./configure --host=m68k-atari-mint --os=TOS

to specify the CPU type (68000, 68010, 68020, 68030, 68040 or
68060) add --cpu :

./configure --host=m68k-atari-mint --os=TOS --cpu=68000

The 68030 build will not run on a stock ST/STE. To build a version
that will run on any machine in the Atari ST family, use --cpu=68000.


* Performance

Based on a typical scene on level 1 :

- 68000 build on ST/STE is 6-15fps (busy-quiet), Mega STE is 18fps
- 68030 build is 60fps (the maximum frame rate)


* Precompiled versions

http://nanard.free.fr/opendune/

Discussion about the port on atari-forum.com :
http://www.atari-forum.com/viewtopic.php?f=26&t=29873


* Running

- MIDI music is sent to the ATARI MIDI Out port : use a General MIDI
or MT32 compatible expander to hear music. Set mt32midi=1 in OPENDUNE.INI
to enable the MT32 songs.

- 320x200 (RGB) or 320x240 (VGA) 8bpp modes are used on Falcon.
TT Low (320x480 8bpp) is used on TT.
ST Low (320x200 4bpp) is used on ST/STE.

- on a Mega STE the CPU is switched to 16MHz with the cache enabled
at startup, and put back to whatever it was on exit. Detected from the
_MCH cookie, so nothing is touched on any other machine.

- Keyboard and mouse input is managed with a custom IKBD interrupt
handler.

- Digitized Sound and Voices are played using STE DMA Sound.
Depending on your Falcon configuration, you may need to run
FPATCH.PRG / FPATCH2.PRG before launching the game

- OPENDUNE.INI file should be located in the same directory as
OPENDUNE.TOS.

- DOS Dune II v1.07 original files should be in a DATA subdirectory,
savegames and options will be stored in a SAVES subdirectory.


Thomas Bernard


* Added by Neil Rackett (neilrackett.com), 2026 :

- Support for 68000 and other CPUs (--cpu build option)
- Automatic 16MHz+cache switching on Mega STE
- Fixes for misaligned word accesses
- Fixes for cutscene timing on slower machines
- Build fix for current MiNTLib (VsetScreen)