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Corrects visibility of SCSI output.

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This commit is contained in:
Thomas Harte 2021-02-02 20:24:39 -05:00
parent 2a8e8a4982
commit f57e897085
1 changed files with 7 additions and 1 deletions
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8
Machines/Electron/Electron.cpp
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@ -553,6 +553,12 @@ template <bool has_scsi_bus> class ConcreteMachine:
push_scsi_output();
}
// Output occurs only while SCSI::Line::Input is inactive; therefore a change
// in that line affects what's on the bus.
if(((new_state^previous_bus_state_)&SCSI::Line::Input)) {
push_scsi_output();
}
scsi_interrupt_state_ |= (new_state^previous_bus_state_)&new_state & SCSI::Line::Request;
previous_bus_state_ = new_state;
evaluate_interrupts();
@ -781,7 +787,7 @@ template <bool has_scsi_bus> class ConcreteMachine:
bool scsi_interrupt_mask_ = false;
void push_scsi_output() {
scsi_bus_.set_device_output(scsi_device_,
scsi_data_ |
(scsi_bus_.get_state()&SCSI::Line::Input ? 0 : scsi_data_) |
(scsi_select_ ? SCSI::Line::SelectTarget : 0) |
(scsi_acknowledge_ ? SCSI::Line::Acknowledge : 0)
);