OSNews on Nostr: The VGA attribute controller is weird The grabber in Windows 3.1 was improved to save ...
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 t
https://www.osnews.com/story/139591/the-vga-attribute-controller-is-weird/
#Windows
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 t
https://www.osnews.com/story/139591/the-vga-attribute-controller-is-weird/
#Windows