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Merge pull request #1367 from TomHarte/FloppyHeft

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Slightly reduce processing heft of floppy accesses.
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Thomas Harte 2024-04-28 22:49:31 -04:00 committed by GitHub
commit b66d69b60c
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2 changed files with 5 additions and 5 deletions
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5
Machines/Acorn/Archimedes/FloppyDisc.hpp
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@ -16,7 +16,7 @@ template <typename InterruptObserverT>
class FloppyDisc: public WD::WD1770, public WD::WD1770::Delegate { class FloppyDisc: public WD::WD1770, public WD::WD1770::Delegate {
public: public:
FloppyDisc(InterruptObserverT &observer) : WD::WD1770(P1772), observer_(observer) { FloppyDisc(InterruptObserverT &observer) : WD::WD1770(P1772), observer_(observer) {
emplace_drives(4, 8000000, 300, 2); emplace_drives(1, 8000000, 300, 2);
set_delegate(this); set_delegate(this);
} }
@ -25,13 +25,12 @@ public:
} }
void set_control(uint8_t value) { void set_control(uint8_t value) {
// TODO:
// b0, b1, b2, b3 = drive selects; // b0, b1, b2, b3 = drive selects;
// b4 = side select; // b4 = side select;
// b5 = motor on/off // b5 = motor on/off
// b6 = floppy in use (i.e. LED?); // b6 = floppy in use (i.e. LED?);
// b7 = disc eject/change reset. // b7 = disc eject/change reset.
set_drive((value & 0xf) ^ 0xf); set_drive((value & 0x1) ^ 0x1);
get_drive().set_head(1 ^ ((value >> 4) & 1)); get_drive().set_head(1 ^ ((value >> 4) & 1));
get_drive().set_motor_on(!(value & 0x20)); get_drive().set_motor_on(!(value & 0x20));
} }

5
Storage/Disk/Drive.cpp
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@ -203,8 +203,9 @@ void Drive::advance(const Cycles cycles) {
} }
void Drive::run_for(const Cycles cycles) { void Drive::run_for(const Cycles cycles) {
// Assumed: the index pulse pulses even if the drive has stopped spinning. // Assumed: the index pulse will end even if the drive has stopped spinning.
index_pulse_remaining_ = std::max(index_pulse_remaining_ - cycles, Cycles(0)); // Also: because the count here is a 64-bit integer, the std::max can be ignored.
index_pulse_remaining_ -= cycles;// std::max(index_pulse_remaining_ - cycles, Cycles(0));
if(time_until_motor_transition > Cycles(0)) { if(time_until_motor_transition > Cycles(0)) {
if(time_until_motor_transition > cycles) { if(time_until_motor_transition > cycles) {