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Merge pull request #976 from TomHarte/DiskIIClocking

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Correct Disk II sleeping test to allow for spin-down.
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Thomas Harte 2021-07-16 17:22:04 -04:00 committed by GitHub
commit 8a95b91e2a
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1 changed files with 8 additions and 3 deletions
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Components/DiskII/DiskII.cpp
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@ -137,10 +137,15 @@ void DiskII::decide_clocking_preference() {
// If in read mode, clocking is either:
//
// just-in-time, if drives are running or the shift register has any 1s in it or a flux event hasn't yet passed; or
// none, given that drives are not running, the shift register has already emptied and there's no flux about to be received.
// just-in-time, if drives are running or the shift register has any 1s in it and shifting may occur, or a flux event hasn't yet passed; or
// none, given that drives are not running, the shift register has already emptied or stopped and there's no flux about to be received.
if(!(inputs_ & ~input_flux)) {
clocking_preference_ = (!motor_is_enabled_ && !shift_register_ && (inputs_&input_flux)) ? ClockingHint::Preference::None : ClockingHint::Preference::JustInTime;
const bool is_stuck_at_nop =
!flux_duration_ && state_machine_[(state_ & 0xf0) | inputs_ | ((shift_register_&0x80) >> 6)] == state_ && (state_ &0xf) == 0x8;
clocking_preference_ =
(drive_is_sleeping_[0] && drive_is_sleeping_[1] && (!shift_register_ || is_stuck_at_nop) && (inputs_&input_flux))
? ClockingHint::Preference::None : ClockingHint::Preference::JustInTime;
}
// If in writing mode, clocking is real time.