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Reintroduce RDY control.

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This commit is contained in:
Thomas Harte 2025-01-02 13:49:24 -05:00
parent 1625f5c0f9
commit dbe733524c
1 changed files with 7 additions and 2 deletions
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9
Machines/Commodore/Plus4/Video.hpp
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@ -285,6 +285,10 @@ public:
// Advance DMA state machine.
for(int cycle = 0; cycle < window_count; cycle++) {
const auto is_active = [&] { return dma_window_ && (bad_line2_ || bad_line()); };
const auto set_idle = [&] {
dma_state_ = DMAState::IDLE;
interrupts_.bus().set_ready_line(false);
};
switch(dma_state_) {
case DMAState::IDLE:
if(is_active()) {
@ -296,13 +300,14 @@ public:
case DMAState::THALT3:
if(is_active()) {
dma_state_ = DMAState(int(dma_state_) + 1);
interrupts_.bus().set_ready_line(true);
} else {
dma_state_ = DMAState::IDLE;
set_idle();
}
break;
case DMAState::TDMA:
if(!is_active()) {
dma_state_ = DMAState::IDLE;
set_idle();
}
break;
}