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Restrict counter sizes; invert written horizontal counter.

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This commit is contained in:
Thomas Harte 2025-01-11 23:19:01 -05:00
parent 2b28df280e
commit cd36f3f096
1 changed files with 6 additions and 3 deletions
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9
Machines/Commodore/Plus4/Video.hpp
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@ -167,7 +167,10 @@ public:
case 0xff1c: vertical_counter_ = (vertical_counter_ & 0x00ff) | ((value & 3) << 8); break;
case 0xff1d: vertical_counter_ = (vertical_counter_ & 0xff00) | value; break;
case 0xff1e: horizontal_counter_ = (horizontal_counter_ & 0x07) | ((value<< 2) & 0x1f8); break;
case 0xff1e:
// TODO: possibly should be deferred, if falling out of phase?
horizontal_counter_ = (horizontal_counter_ & 0x07) | ((~value << 2) & 0x1f8);
break;
case 0xff1f:
vertical_sub_count_ = value & 0x7;
flash_count_ = (flash_count_ & 0x10) | ((value >> 3) & 0xf);
@ -414,10 +417,10 @@ public:
next_pixels_.write(pixels);
shifter_.advance();
++video_counter_;
video_counter_ = (video_counter_ + 1) & 0x3ff;
}
if(increment_character_position_ && character_fetch_) {
++character_position_;
character_position_ = (character_position_ + 1) & 0x3ff;
}
if(enable_display_) {
switch(x_scroll_) {