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Gravis UltraSound: additions, improvements and fixes #6154

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Merged
OBattler merged 7 commits into from
Sep 11, 2025
Merged

Gravis UltraSound: additions, improvements and fixes #6154

OBattler merged 7 commits into from
Sep 11, 2025

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@lemondrops
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@lemondrops lemondrops commented Sep 11, 2025

Summary

  • Added the Gravis UltraSound ACE;
  • Added the GUS Classic revision 3.7+ with the onboard ICS2101 mixer chip, specifically the revision without the reversed channels bug;
  • Implemented the onboard game port on all cards except ACE (its "phantom" gameport isn't implemented either): it's jumpered on the GUS Classic pre-3.7 (reflecting the pre-3.4 revisions of the card) and software-controlled on Classic 3.7 and MAX (external MIDI is now also toggleable in software on these cards);
  • Fixed the mixer on the GUS MAX being mostly non-functional;
  • Raised the minimum onboard RAM amount for all GUS non-Classic to 512 KB.

Checklist

  • Closes #xxx
  • I have discussed this with core contributors already
  • This pull request requires changes to the ROM set

References

ICS-2101 datasheet
UltraSound Lowlevel Toolkit
CS4231A datasheet
Linux kernel source code
DOSBox-X source code
DOSBox patch for GUS v3.7

@lemondrops
GUS gameport work
91413a8 
Classic: gameport toggleable by jumper/config option (pre-rev 3.4), disabled by default
MAX: gameport toggleable by software register (post-rev 3.4), enabled by default
Disable access to rev 3.4+ registers on Classic
@lemondrops
GUS: Correct minimum RAM amount for GUS MAX
7f74616
@lemondrops
GUS: Add the UltraSound ACE
eec9b52
@lemondrops
Add the Gravis UltraSound revision 3.7
cb96d4e 
Implement the ICS-2101 mixer chip that it has
@lemondrops
AD1848: Make CD audio input designated per-card
a59eb52 
Fixes CD audio mixer not working for GUS MAX
@lemondrops
AD1848: Extend ad1848_filter_aux2 to any channel
14cf9ee
@lemondrops
GUS: Refactor the buffer/mixer code and fix the MAX mixer's GF1 input
1340b03
@OBattler OBattler merged commit 116033a into 86Box:master Sep 11, 2025
47 checks passed
@lemondrops lemondrops deleted the gus branch September 11, 2025 17:09
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2 participants

@lemondrops @OBattler