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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
//
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// DiskII.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 23/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "DiskIICard.hpp"
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using namespace Apple::II;
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DiskIICard::DiskIICard(const ROMMachine::ROMFetcher &rom_fetcher, bool is_16_sector) : diskii_(2045454) {
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std::vector<std::unique_ptr<std::vector<uint8_t>>> roms;
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if(is_16_sector) {
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roms = rom_fetcher({
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{"DiskII", "the Disk II 16-sector boot ROM", "boot-16.rom", 256, 0xce7144f6},
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{"DiskII", "the Disk II 16-sector state machine ROM", "state-machine-16.rom", 256, { 0x9796a238, 0xb72a2c70 } }
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});
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} else {
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roms = rom_fetcher({
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{"DiskII", "the Disk II 13-sector boot ROM", "boot-13.rom", 256, 0xd34eb2ff},
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{"DiskII", "the Disk II 13-sector state machine ROM", "state-machine-13.rom", 256, 0x62e22620 }
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});
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}
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if(!roms[0] || !roms[1]) {
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throw ROMMachine::Error::MissingROMs;
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}
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boot_ = std::move(*roms[0]);
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diskii_.set_state_machine(*roms[1]);
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set_select_constraints(None);
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diskii_.set_clocking_hint_observer(this);
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}
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void DiskIICard::perform_bus_operation(Select select, bool is_read, uint16_t address, uint8_t *value) {
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diskii_.set_data_input(*value);
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switch(select) {
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default: break;
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case IO: {
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const int disk_value = diskii_.read_address(address);
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if(is_read) {
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if(disk_value != diskii_.DidNotLoad)
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*value = static_cast<uint8_t>(disk_value);
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}
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} break;
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case Device:
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if(is_read) *value = boot_[address & 0xff];
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break;
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}
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}
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void DiskIICard::run_for(Cycles cycles, int stretches) {
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if(diskii_clocking_preference_ == ClockingHint::Preference::None) return;
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diskii_.run_for(Cycles(cycles.as_integral() * 2));
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}
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void DiskIICard::set_disk(const std::shared_ptr<Storage::Disk::Disk> &disk, int drive) {
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diskii_.set_disk(disk, drive);
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}
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void DiskIICard::set_activity_observer(Activity::Observer *observer) {
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diskii_.set_activity_observer(observer);
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}
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void DiskIICard::set_component_prefers_clocking(ClockingHint::Source *component, ClockingHint::Preference preference) {
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diskii_clocking_preference_ = preference;
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set_select_constraints((preference != ClockingHint::Preference::RealTime) ? (IO | Device) : None);
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}
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Storage::Disk::Drive &DiskIICard::get_drive(int drive) {
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return diskii_.get_drive(drive);
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}
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