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Add the Tandy 1000 RSX (plus PSSJ fixes)#6790

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OBattler merged 5 commits into
86Box:masterfrom
win2kgamer:t1000rsx
Feb 8, 2026
Merged

Add the Tandy 1000 RSX (plus PSSJ fixes)#6790
OBattler merged 5 commits into
86Box:masterfrom
win2kgamer:t1000rsx

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Summary

Add the Tandy 1000 RSX machine and fix two issues with the PSSJ causing the Win3.1 Tandy DAC driver to throw an error:

  • PSSJ port C7/1E7 bit 4 is reserved and should not be writable
  • Actually clear the PSSJ DAC IRQ when port C4/1E4 has bit 3 cleared

Checklist

  • Closes #xxx
  • I have tested my changes locally and validated that the functionality works as intended
  • I have discussed this with core contributors already
  • This pull request requires changes to the ROM set
  • This pull request requires changes to the asset set

References

Provide links to datasheets or other documentation that helped you implement this pull request.
Tandy 1000TL Technical Reference (PSSJ fixes): http://ftp.oldskool.org/pub/tvdog/tandy1000/documents/tltech.zip
Tandy 1000 RSX board entry on TRW: https://theretroweb.com/motherboards/s/tandy-1000-rsx

@OBattler OBattler merged commit 819f437 into 86Box:master Feb 8, 2026
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@win2kgamer win2kgamer deleted the t1000rsx branch February 10, 2026 01:31
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2 participants