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Made the Plus 3 less chatty, documented invalidate_track.

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This commit is contained in:
Thomas Harte 2016-12-25 21:06:58 -05:00
parent 26710c988d
commit 4fca30b81f
3 changed files with 23 additions and 8 deletions
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26
Machines/Electron/Plus3.cpp
View File

@ -24,18 +24,28 @@ void Plus3::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive)
void Plus3::set_control_register(uint8_t control)
{
// TODO:
// bit 0 => enable or disable drive 1
// bit 1 => enable or disable drive 2
// bit 2 => side select
// bit 3 => single density select
switch(control&3)
uint8_t changes = control ^ last_control_;
last_control_ = control;
if(changes&3)
{
case 0: selected_drive_ = -1; set_drive(nullptr); break;
default: selected_drive_ = 0; set_drive(drives_[0]); break;
case 2: selected_drive_ = 1; set_drive(drives_[1]); break;
switch(control&3)
{
case 0: selected_drive_ = -1; set_drive(nullptr); break;
default: selected_drive_ = 0; set_drive(drives_[0]); break;
case 2: selected_drive_ = 1; set_drive(drives_[1]); break;
}
}
if(drives_[0]) drives_[0]->set_head((control & 0x04) ? 1 : 0);
if(drives_[1]) drives_[1]->set_head((control & 0x04) ? 1 : 0);
set_is_double_density(!(control & 0x08));
if(changes & 0x04)
{
invalidate_track();
if(drives_[0]) drives_[0]->set_head((control & 0x04) ? 1 : 0);
if(drives_[1]) drives_[1]->set_head((control & 0x04) ? 1 : 0);
}
if(changes & 0x08) set_is_double_density(!(control & 0x08));
}

1
Machines/Electron/Plus3.hpp
View File

@ -23,6 +23,7 @@ class Plus3 : public WD::WD1770 {
private:
std::shared_ptr<Storage::Disk::Drive> drives_[2];
int selected_drive_;
uint8_t last_control_;
};
}

4
Storage/Disk/DiskController.hpp
View File

@ -49,6 +49,10 @@ class Controller: public DigitalPhaseLockedLoop::Delegate, public TimedEventLoop
Sets the current drive.
*/
void set_drive(std::shared_ptr<Drive> drive);
/*!
Announces that the track the drive sees is about to change for a reason unknownt to the controller.
*/
void invalidate_track();
/*!