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Merge pull request #1456 from TomHarte/CounterSets

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Correct shift on hcount write.
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Thomas Harte 2025-01-12 22:32:46 -05:00 committed by GitHub
commit 733da3161b
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1 changed files with 2 additions and 3 deletions
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5
Machines/Commodore/Plus4/Video.hpp
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@ -100,8 +100,6 @@ public:
video_mode_ = VideoMode::Text;
}
}
// printf("Mode: %d %d %d -> %d\n", bitmap_mode_, extended_colour_mode_, multicolour_mode_, int(video_mode_));
};
switch(address) {
@ -169,7 +167,8 @@ public:
case 0xff1d: vertical_counter_ = (vertical_counter_ & 0xff00) | value; break;
case 0xff1e:
// TODO: possibly should be deferred, if falling out of phase?
horizontal_counter_ = (horizontal_counter_ & 0x07) | ((~value << 2) & 0x1f8);
horizontal_counter_ = (horizontal_counter_ & 0x07) | ((~value << 1) & ~0x07);
horizontal_counter_ &= 0x1ff;
break;
case 0xff1f:
vertical_sub_count_ = value & 0x7;