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79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
//
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// EXDos.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 20/06/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#include "EXDos.hpp"
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// TODO: disk_did_change_ should be on the drive. Some drives report it.
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using namespace Enterprise;
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EXDos::EXDos() : WD1770(P1770) {
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emplace_drives(4, 8000000, 300, 2);
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set_control_register(0x00);
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}
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void EXDos::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, size_t drive) {
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get_drive(drive).set_disk(disk);
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disk_did_change_ = true;
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}
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// Documentation for the control register:
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//
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// Write:
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// b7 in use (???)
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// b6 disk change reset
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// b5 0 = double density, 1 = single density
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// b4 side 1 select
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// b3, b3, b1, b0 select drive 3, 2, 1, 0
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//
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// Read:
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// b7 data request from WD1770
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// b6 disk change
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// b5, b4, b3, b2: not used
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// b1 interrupt request from WD1770
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// b0 drive ready
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void EXDos::set_control_register(uint8_t control) {
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if(control & 0x40) disk_did_change_ = false;
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set_is_double_density(!(control & 0x20));
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// Set side.
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const int head = (control >> 4) & 1;
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for(size_t c = 0; c < 4; c++) {
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get_drive(c).set_head(head);
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}
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// Select drive, ensuring handover of the motor-on state.
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const bool motor_state = get_drive().get_motor_on();
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for_all_drives([] (Storage::Disk::Drive &drive, size_t) {
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drive.set_motor_on(false);
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});
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set_drive(control & 0xf);
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get_drive().set_motor_on(motor_state);
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}
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uint8_t EXDos::get_control_register() {
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const uint8_t status =
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(get_data_request_line() ? 0x80 : 0x00) |
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(disk_did_change_ ? 0x40 : 0x00) |
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(get_interrupt_request_line() ? 0x02 : 0x00) |
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(get_drive().get_is_ready() ? 0x01 : 0x00);
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return status;
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}
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void EXDos::set_motor_on(bool on) {
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get_drive().set_motor_on(on);
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}
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void EXDos::set_activity_observer(Activity::Observer *observer) {
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for_all_drives([observer] (Storage::Disk::Drive &drive, size_t index) {
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drive.set_activity_observer(observer, "Drive " + std::to_string(index+1), true);
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});
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}
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