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The VGA attribute controller is weird
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The VGA attribute controller is weird
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7th May 2024, 04:20
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| [M] Reviewer  Join Date: May 2010 Location: Romania
Posts: 152,472
 |  The VGA attribute controller is weird The grabber in Windows 3.1 was improved to save and restore the index register as well, but it does not attempt to restore the flip-flop state, which is significant. The problem with the VGA emulation was that it erroneously applied the flip-flop state to reads from port 3C0h, and Windows 3.1 would save the wrong index register value… but only the second time through, because the flip-flop state was different at that point. That is to say, the Windows 3.1 standard mode grabber read from port 3C0h to query the attribute controller index register state, but the emulation returned the currently selected data register contents instead. https://www.osnews.com/story/139591/...ller-is-weird/ |
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