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Fixes horizontal counter wrapping.

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This commit is contained in:
Thomas Harte 2018-10-11 20:37:29 -04:00
parent 52e02db5c8
commit 82b7944599
1 changed files with 1 additions and 1 deletions
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Components/9918/9918.cpp
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@ -548,7 +548,7 @@ uint8_t TMS9918::get_latched_horizontal_counter() {
// which makes the 256 pixels the first 256 spots, but starts
// counting at -48, and returns only the top 8 bits of the number.
int public_counter = latched_column_ - 86;
if(public_counter < -48) public_counter += 342;
if(public_counter < -46) public_counter += 342;
return uint8_t(public_counter >> 1);
}