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Merge pull request #1131 from TomHarte/MSXLineInterrupts

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Restrict disabled MSX line interrupt signalling.
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Thomas Harte 2023-05-08 09:55:52 -04:00 committed by GitHub
commit 54f5bae59e
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1 changed files with 6 additions and 3 deletions
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9
Components/9918/Implementation/9918.cpp
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@ -44,8 +44,11 @@ Base<personality>::Base() :
}
if constexpr (is_yamaha_vdp(personality)) {
// TODO: start of sync, or end of sync?
mode_timing_.line_interrupt_position = 0;//Timing<personality>::StartOfSync;
// TODO: start of sync, or end of sync? Or elsewhere.
// Note that there's a bug elsewhere if the proper value of this is zero in the
// "if started before but reached this count" logic — that is boxed into considering
// a single line only so never sees starts before 0.
mode_timing_.line_interrupt_position = LineLayout<personality>::EndOfSync;
}
// Establish that output is delayed after reading by `output_lag` cycles,
@ -1110,7 +1113,7 @@ uint8_t Base<personality>::read_register() {
// Reset upon read.
const uint8_t result =
(personality == Personality::V9938 ? 0x0 : 0x4) |
(line_interrupt_pending_ ? 0x01 : 0x00);
((line_interrupt_pending_ && enable_line_interrupts_) ? 0x01 : 0x00);
line_interrupt_pending_ = false;
return result;