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Attempts to reduce FDC costs.

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This commit is contained in:
Thomas Harte 2018-05-27 23:55:04 -04:00
parent db8d8d8404
commit f3fe711542
1 changed files with 14 additions and 1 deletions
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15
Machines/AmstradCPC/AmstradCPC.cpp
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@ -746,7 +746,7 @@ class ConcreteMachine:
ay_.run_for(cycle.length);
// Clock the FDC, if connected, using a lazy scale by two
if(has_fdc_ && !fdc_is_sleeping_) fdc_.run_for(Cycles(cycle.length.as_int()));
time_since_fdc_update_ += cycle.length;
// Update typing activity
if(typer_) typer_->run_for(cycle.length);
@ -793,11 +793,13 @@ class ConcreteMachine:
// Check for an FDC access
if(has_fdc_ && (address & 0x580) == 0x100) {
flush_fdc();
fdc_.set_register(address & 1, *cycle.value);
}
// Check for a disk motor access
if(has_fdc_ && !(address & 0x580)) {
flush_fdc();
fdc_.set_motor_on(!!(*cycle.value));
}
break;
@ -812,6 +814,7 @@ class ConcreteMachine:
// Check for an FDC access
if(has_fdc_ && (address & 0x580) == 0x100) {
flush_fdc();
*cycle.value &= fdc_.get_register(address & 1);
}
@ -855,6 +858,7 @@ class ConcreteMachine:
// Just flush the AY.
ay_.update();
ay_.flush();
flush_fdc();
}
/// A CRTMachine function; indicates that outputs should be created now.
@ -967,6 +971,7 @@ class ConcreteMachine:
void set_component_prefers_clocking(ClockingHint::Source *component, ClockingHint::Preference clocking) override final {
fdc_is_sleeping_ = fdc_.preferred_clocking() == ClockingHint::Preference::None;
tape_player_is_sleeping_ = tape_player_.preferred_clocking() == ClockingHint::Preference::None;
printf("FDC: %s, tape %s\n", fdc_is_sleeping_ ? "sleeping" : "regular", tape_player_is_sleeping_ ? "sleeping" : "regular");
}
// MARK: - Keyboard
@ -1060,6 +1065,14 @@ class ConcreteMachine:
Intel::i8255::i8255<i8255PortHandler> i8255_;
FDC fdc_;
HalfCycles time_since_fdc_update_;
void flush_fdc() {
// Clock the FDC, if connected, using a lazy scale by two
if(has_fdc_ && !fdc_is_sleeping_) {
fdc_.run_for(Cycles(time_since_fdc_update_.as_int()));
}
time_since_fdc_update_ = HalfCycles(0);
}
InterruptTimer interrupt_timer_;
Storage::Tape::BinaryTapePlayer tape_player_;