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Backport S/VGA timing fix from 86Box #13

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CasualPokePlayer opened this issue May 15, 2024 · 0 comments
Open

Backport S/VGA timing fix from 86Box #13

CasualPokePlayer opened this issue May 15, 2024 · 0 comments

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@CasualPokePlayer
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CasualPokePlayer commented May 15, 2024 •
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86Box/86Box@b67c3c4

The off by one in PCem causes the refresh rate for S/VGA to be wrong (mainly relevant for DOS).

For example, standard DOS 70Hz (25.175MHz clock, 8 pixels per character, 95 Horizontal Total, 449 scanlines)
(25175000/((95+6)*8))/449 -> 69.3923791043Hz
(25175000/((95+5)*8))/449 -> 70.0863028953Hz
@CasualPokePlayer CasualPokePlayer changed the title Backport S/VGA timing fix from x86Box Backport S/VGA timing fix from 86Box May 16, 2024
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@CasualPokePlayer