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Attempts to get E synchronisation correct.

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This commit is contained in:
Thomas Harte 2021-08-05 20:08:34 -04:00
parent db3c158215
commit dcbc9847a3
1 changed files with 12 additions and 7 deletions
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19
Processors/68000/Implementation/68000Implementation.hpp
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@ -136,12 +136,11 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
auto cycle_copy = active_step_->microcycle;
cycle_copy.operation |= Microcycle::IsPeripheral;
// Extend length by: (i) distance to next E low, plus (ii) difference between
// Length will be: (i) distance to next E cycle, plus (ii) difference between
// current length and a whole E cycle.
cycle_copy.length = HalfCycles(20); // i.e. one E cycle in length.
cycle_copy.length += (e_clock_phase_ + cycles_run_for) % 20;
// TODO: verify logic above; I'm not persuaded.
const auto phase_now = (e_clock_phase_ + cycles_run_for) % 20;
const auto time_to_boundary = (HalfCycles(20) - phase_now) % HalfCycles(20);
cycle_copy.length = HalfCycles(20) + time_to_boundary;
cycles_run_for +=
cycle_copy.length +
@ -1897,10 +1896,16 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
negative_flag_ = zero_result_ & 0x80000000;
break;
case Operation::STOP:
case Operation::STOP: {
static int stops = 0;
++stops;
if(stops == 559) {
printf("");
}
apply_status(prefetch_queue_.halves.low.full);
execution_state_ = ExecutionState::Stopped;
break;
} break;
/*
Development period debugging.