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Update Tseng emulation to reflect port 3DAh behavior and CRTC register 33h behavior that is documented by Tseng and expected by VGAKIT

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Jonathan Campbell
2025-10-05 20:43:11 -07:00
parent 69e2e358e1
commit 199c065161
3 changed files with 27 additions and 8 deletions
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@@ -1,4 +1,10 @@
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- Tseng ET3000/ET4000: Update Status register 3DAh behavior when emulating
Tseng chipsets to reflect Tseng datasheet, and VGAKIT SVGA detection code
expectations. Bit 7 is expected, as documented by Tseng, to be the inverse
of bit 3 (vertical retrace). Extended Start Register CRTC 33h must not
allow setting the upper 4 bits because Tseng only documents the bottom
four, and because VGAKIT requires it for Tseng detection (joncampbell123).
- Fix bug that, for machine=hercules, prevented Hercules palette shortcut
from changing colors when in graphics mode (joncampbell123).
- Remove mixer and VGA capture test modes from integration device. Update