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https://github.com/TomHarte/CLK.git
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96648df5fe
Specifically to resolve an error with shift being pressed at startup due to a failure to establish a default value for that flag, but applying the same principle across the board.
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
//
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// Plus3.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 25/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Plus3.hpp"
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using namespace Electron;
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Plus3::Plus3() : WD1770(P1770) {
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set_control_register(last_control_, 0xff);
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}
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void Plus3::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
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if(!drives_[drive]) {
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drives_[drive].reset(new Storage::Disk::Drive);
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if(drive == selected_drive_) set_drive(drives_[drive]);
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}
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drives_[drive]->set_disk(disk);
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}
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void Plus3::set_control_register(uint8_t control) {
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// bit 0 => enable or disable drive 1
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// bit 1 => enable or disable drive 2
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// bit 2 => side select
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// bit 3 => single density select
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uint8_t changes = control ^ last_control_;
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last_control_ = control;
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set_control_register(control, changes);
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}
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void Plus3::set_control_register(uint8_t control, uint8_t changes) {
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if(changes&3) {
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switch(control&3) {
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case 0: selected_drive_ = -1; set_drive(nullptr); break;
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default: selected_drive_ = 0; set_drive(drives_[0]); break;
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case 2: selected_drive_ = 1; set_drive(drives_[1]); break;
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}
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}
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if(changes & 0x04) {
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invalidate_track();
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if(drives_[0]) drives_[0]->set_head((control & 0x04) ? 1 : 0);
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if(drives_[1]) drives_[1]->set_head((control & 0x04) ? 1 : 0);
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}
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if(changes & 0x08) set_is_double_density(!(control & 0x08));
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}
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