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Fixed AY queuing behaviour as handled by the Amstrad. I think I need to come up with clearer semantics here.

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This commit is contained in:
Thomas Harte 2017-08-05 09:12:17 -04:00
parent b999c1d8aa
commit b3788fed41
1 changed files with 7 additions and 1 deletions
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8
Machines/AmstradCPC/AmstradCPC.cpp
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@ -108,9 +108,13 @@ class AYDeferrer {
cycles_since_update_ += half_cycles; cycles_since_update_ += half_cycles;
} }
/// Enqueues an update-to-now into the AY's deferred queue.
inline void update() {
ay_->run_for(cycles_since_update_.divide_cycles(Cycles(4)));
}
/// Issues a request to the AY to perform all processing up to the current time. /// Issues a request to the AY to perform all processing up to the current time.
inline void flush() { inline void flush() {
ay_->run_for(cycles_since_update_.divide_cycles(Cycles(4)));
ay_->flush(); ay_->flush();
} }
@ -443,6 +447,7 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
switch(port) { switch(port) {
case 0: case 0:
// Port A is connected to the AY's data bus. // Port A is connected to the AY's data bus.
ay_.update();
ay_.ay()->set_data_input(value); ay_.ay()->set_data_input(value);
break; break;
case 1: case 1:
@ -628,6 +633,7 @@ class ConcreteMachine:
/// Another Z80 entry point; indicates that a partcular run request has concluded. /// Another Z80 entry point; indicates that a partcular run request has concluded.
void flush() { void flush() {
// Just flush the AY. // Just flush the AY.
ay_.update()
ay_.flush(); ay_.flush();
} }