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Merge pull request #3395 from iamgreaser/gm/issue-3386-ega-split-screen

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(mostly) Fix EGA split screen - fix done by @cons-cinnabar
This commit is contained in:
Miran Grča
2023-06-11 13:39:15 +02:00
committed by GitHub
parent 5bdc635919 078651d273
commit 827500f861
1 changed files with 3 additions and 2 deletions
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5
src/video/vid_ega.c
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@@ -582,10 +582,11 @@ ega_poll(void *p)
ega->vc++;
ega->vc &= 511;
if (ega->vc == ega->split) {
// TODO: Implement the hardware bug where the first scanline is drawn twice when the split happens
if (ega->interlace && ega->oddeven)
ega->ma = ega->maback = ega->ma_latch + (ega->rowoffset << 1);
ega->ma = ega->maback = ega->rowoffset << 1;
else
ega->ma = ega->maback = ega->ma_latch;
ega->ma = ega->maback = 0;
ega->ma <<= 2;
ega->maback <<= 2;
ega->sc = 0;