mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-27 01:31:42 +00:00
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
//
|
|
// Plus3.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 25/09/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "Plus3.hpp"
|
|
|
|
using namespace Electron;
|
|
|
|
Plus3::Plus3() : WD1770(P1770), last_control_(0) {
|
|
set_control_register(last_control_, 0xff);
|
|
}
|
|
|
|
void Plus3::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
|
|
if(!drives_[drive]) {
|
|
drives_[drive].reset(new Storage::Disk::Drive);
|
|
if(drive == selected_drive_) set_drive(drives_[drive]);
|
|
}
|
|
drives_[drive]->set_disk(disk);
|
|
}
|
|
|
|
void Plus3::set_control_register(uint8_t control) {
|
|
// bit 0 => enable or disable drive 1
|
|
// bit 1 => enable or disable drive 2
|
|
// bit 2 => side select
|
|
// bit 3 => single density select
|
|
|
|
uint8_t changes = control ^ last_control_;
|
|
last_control_ = control;
|
|
set_control_register(control, changes);
|
|
}
|
|
|
|
void Plus3::set_control_register(uint8_t control, uint8_t changes) {
|
|
if(changes&3) {
|
|
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(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));
|
|
}
|