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52ea3b741c
All existing receivers ignore it.
797 lines
25 KiB
C++
797 lines
25 KiB
C++
//
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// Electron.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/01/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#include "Electron.hpp"
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#include "../../Activity/Source.hpp"
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#include "../MachineTypes.hpp"
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#include "../../Configurable/Configurable.hpp"
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#include "../../ClockReceiver/ClockReceiver.hpp"
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#include "../../ClockReceiver/ForceInline.hpp"
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#include "../../Configurable/StandardOptions.hpp"
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#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
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#include "../../Processors/6502/6502.hpp"
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#include "../../Storage/MassStorage/SCSI/SCSI.hpp"
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#include "../../Storage/MassStorage/SCSI/DirectAccessDevice.hpp"
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#include "../../Storage/Tape/Tape.hpp"
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#include "../Utility/Typer.hpp"
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#include "../../Analyser/Static/Acorn/Target.hpp"
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#include "../../ClockReceiver/JustInTime.hpp"
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#include "Interrupts.hpp"
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#include "Keyboard.hpp"
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#include "Plus3.hpp"
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#include "SoundGenerator.hpp"
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#include "Tape.hpp"
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#include "Video.hpp"
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namespace Electron {
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template <bool has_scsi_bus> class ConcreteMachine:
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public Machine,
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public MachineTypes::TimedMachine,
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public MachineTypes::ScanProducer,
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public MachineTypes::AudioProducer,
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public MachineTypes::MediaTarget,
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public MachineTypes::MappedKeyboardMachine,
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public Configurable::Device,
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public CPU::MOS6502::BusHandler,
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public Tape::Delegate,
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public Utility::TypeRecipient<CharacterMapper>,
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public Activity::Source,
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public SCSI::Bus::Observer,
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public ClockingHint::Observer {
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public:
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ConcreteMachine(const Analyser::Static::Acorn::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
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m6502_(*this),
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scsi_bus_(4'000'000),
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hard_drive_(scsi_bus_, 0),
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scsi_device_(scsi_bus_.add_device()),
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video_(ram_),
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sound_generator_(audio_queue_),
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speaker_(sound_generator_) {
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memset(key_states_, 0, sizeof(key_states_));
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for(int c = 0; c < 16; c++)
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memset(roms_[c], 0xff, 16384);
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tape_.set_delegate(this);
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set_clock_rate(2000000);
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speaker_.set_input_rate(2000000 / SoundGenerator::clock_rate_divider);
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speaker_.set_high_frequency_cutoff(6000);
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::ROM::Request request = ::ROM::Request(::ROM::Name::AcornBASICII) && ::ROM::Request(::ROM::Name::AcornElectronMOS100);
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if(target.has_pres_adfs) {
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request = request && ::ROM::Request(::ROM::Name::PRESADFSSlot1) && ::ROM::Request(::ROM::Name::PRESADFSSlot2);
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}
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if(target.has_acorn_adfs) {
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request = request && ::ROM::Request(::ROM::Name::AcornADFS);
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}
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if(target.has_dfs) {
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request = request && ::ROM::Request(::ROM::Name::Acorn1770DFS);
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}
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if(target.has_ap6_rom) {
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request = request && ::ROM::Request(::ROM::Name::PRESAdvancedPlus6);
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}
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auto roms = rom_fetcher(request);
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if(!request.validate(roms)) {
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throw ROMMachine::Error::MissingROMs;
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}
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set_rom(ROM::BASIC, roms.find(::ROM::Name::AcornBASICII)->second, false);
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set_rom(ROM::OS, roms.find(::ROM::Name::AcornElectronMOS100)->second, false);
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/*
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ROM slot mapping applied:
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* the keyboard and BASIC ROMs occupy slots 8, 9, 10 and 11;
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* the DFS, if in use, occupies slot 1;
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* the Pres ADFS, if in use, occupies slots 4 and 5;
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* the Acorn ADFS, if in use, occupies slot 6;
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* the AP6, if in use, occupies slot 15; and
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* if sideways RAM was asked for, all otherwise unused slots are populated with sideways RAM.
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*/
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if(target.has_dfs || target.has_acorn_adfs || target.has_pres_adfs) {
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plus3_ = std::make_unique<Plus3>();
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if(target.has_dfs) {
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set_rom(ROM::Slot0, roms.find(::ROM::Name::Acorn1770DFS)->second, true);
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}
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if(target.has_pres_adfs) {
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set_rom(ROM::Slot4, roms.find(::ROM::Name::PRESADFSSlot1)->second, true);
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set_rom(ROM::Slot5, roms.find(::ROM::Name::PRESADFSSlot2)->second, true);
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}
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if(target.has_acorn_adfs) {
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set_rom(ROM::Slot6, roms.find(::ROM::Name::AcornADFS)->second, true);
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}
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}
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if(target.has_ap6_rom) {
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set_rom(ROM::Slot15, roms.find(::ROM::Name::PRESAdvancedPlus6)->second, true);
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}
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if(target.has_sideways_ram) {
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for(int c = 0; c < 16; c++) {
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if(rom_inserted_[c]) continue;
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if(c >= int(ROM::Keyboard) && c < int(ROM::BASIC)+1) continue;
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set_sideways_ram(ROM(c));
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}
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}
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insert_media(target.media);
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if(!target.loading_command.empty()) {
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type_string(target.loading_command);
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}
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if(target.should_shift_restart) {
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shift_restart_counter_ = 1000000;
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}
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if(has_scsi_bus) {
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scsi_bus_.add_observer(this);
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scsi_bus_.set_clocking_hint_observer(this);
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}
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}
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~ConcreteMachine() {
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audio_queue_.flush();
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}
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void set_key_state(uint16_t key, bool isPressed) final {
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switch(key) {
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default:
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if(isPressed)
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key_states_[key >> 4] |= key&0xf;
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else
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key_states_[key >> 4] &= ~(key&0xf);
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break;
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case KeyBreak:
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m6502_.set_reset_line(isPressed);
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break;
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#define FuncShiftedKey(source, dest) \
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case source: \
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set_key_state(KeyFunc, isPressed); \
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set_key_state(dest, isPressed); \
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break;
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FuncShiftedKey(KeyF1, Key1);
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FuncShiftedKey(KeyF2, Key2);
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FuncShiftedKey(KeyF3, Key3);
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FuncShiftedKey(KeyF4, Key4);
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FuncShiftedKey(KeyF5, Key5);
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FuncShiftedKey(KeyF6, Key6);
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FuncShiftedKey(KeyF7, Key7);
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FuncShiftedKey(KeyF8, Key8);
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FuncShiftedKey(KeyF9, Key9);
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FuncShiftedKey(KeyF0, Key0);
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#undef FuncShiftedKey
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}
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}
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void clear_all_keys() final {
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memset(key_states_, 0, sizeof(key_states_));
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if(is_holding_shift_) set_key_state(KeyShift, true);
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}
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bool insert_media(const Analyser::Static::Media &media) final {
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if(!media.tapes.empty()) {
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tape_.set_tape(media.tapes.front());
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}
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set_use_fast_tape_hack();
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if(!media.disks.empty() && plus3_) {
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plus3_->set_disk(media.disks.front(), 0);
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}
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ROM slot = ROM::Slot12;
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for(std::shared_ptr<Storage::Cartridge::Cartridge> cartridge : media.cartridges) {
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const ROM first_slot_tried = slot;
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while(rom_inserted_[int(slot)]) {
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slot = ROM((int(slot) + 1) & 15);
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if(slot == first_slot_tried) return false;
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}
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set_rom(slot, cartridge->get_segments().front().data, false);
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}
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// TODO: allow this only at machine startup?
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if(!media.mass_storage_devices.empty()) {
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hard_drive_->set_storage(media.mass_storage_devices.front());
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}
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return !media.empty();
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}
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forceinline Cycles perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
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unsigned int cycles = 1;
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if(address < 0x8000) {
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if(isReadOperation(operation)) {
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*value = ram_[address];
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} else {
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if(address >= video_access_range_.low_address && address <= video_access_range_.high_address) {
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video_.flush();
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}
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ram_[address] = *value;
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}
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// For the entire frame, RAM is accessible only on odd cycles; in modes below 4
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// it's also accessible only outside of the pixel regions.
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cycles += video_.last_valid()->get_cycles_until_next_ram_availability(video_.time_since_flush().template as<int>() + 1);
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} else {
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switch(address & 0xff0f) {
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case 0xfe00:
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if(isReadOperation(operation)) {
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*value = interrupt_status_;
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interrupt_status_ &= ~PowerOnReset;
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} else {
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interrupt_control_ = (*value) & ~1;
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evaluate_interrupts();
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}
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break;
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case 0xfe07:
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if(!isReadOperation(operation)) {
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// update speaker mode
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bool new_speaker_is_enabled = (*value & 6) == 2;
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if(new_speaker_is_enabled != speaker_is_enabled_) {
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update_audio();
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sound_generator_.set_is_enabled(new_speaker_is_enabled);
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speaker_is_enabled_ = new_speaker_is_enabled;
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}
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tape_.set_is_enabled((*value & 6) != 6);
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tape_.set_is_in_input_mode((*value & 6) == 0);
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tape_.set_is_running((*value & 0x40) ? true : false);
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caps_led_state_ = !!(*value & 0x80);
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if(activity_observer_)
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activity_observer_->set_led_status(caps_led, caps_led_state_);
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}
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[[fallthrough]]; // fe07 contains the display mode.
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case 0xfe02: case 0xfe03:
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case 0xfe08: case 0xfe09: case 0xfe0a: case 0xfe0b:
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case 0xfe0c: case 0xfe0d: case 0xfe0e: case 0xfe0f:
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if(!isReadOperation(operation)) {
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video_->write(address, *value);
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video_access_range_ = video_.last_valid()->get_memory_access_range();
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}
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break;
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case 0xfe04:
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if(isReadOperation(operation)) {
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*value = tape_.get_data_register();
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tape_.clear_interrupts(Interrupt::ReceiveDataFull);
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} else {
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tape_.set_data_register(*value);
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tape_.clear_interrupts(Interrupt::TransmitDataEmpty);
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}
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break;
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case 0xfe05:
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if(!isReadOperation(operation)) {
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const uint8_t interruptDisable = (*value)&0xf0;
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if( interruptDisable ) {
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if( interruptDisable&0x10 ) interrupt_status_ &= ~Interrupt::DisplayEnd;
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if( interruptDisable&0x20 ) interrupt_status_ &= ~Interrupt::RealTimeClock;
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if( interruptDisable&0x40 ) interrupt_status_ &= ~Interrupt::HighToneDetect;
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evaluate_interrupts();
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// TODO: NMI
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}
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// latch the paged ROM in case external hardware is being emulated
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active_rom_ = *value & 0xf;
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// apply the ULA's test
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if(*value & 0x08) {
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if(*value & 0x04) {
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keyboard_is_active_ = false;
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basic_is_active_ = false;
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} else {
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keyboard_is_active_ = !(*value & 0x02);
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basic_is_active_ = !keyboard_is_active_;
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}
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}
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}
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break;
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case 0xfe06:
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if(!isReadOperation(operation)) {
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update_audio();
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sound_generator_.set_divider(*value);
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tape_.set_counter(*value);
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}
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break;
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case 0xfc04: case 0xfc05: case 0xfc06: case 0xfc07:
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if(plus3_ && (address&0x00f0) == 0x00c0) {
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if(is_holding_shift_ && address == 0xfcc4) {
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is_holding_shift_ = false;
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set_key_state(KeyShift, false);
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}
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if(isReadOperation(operation))
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*value = plus3_->read(address);
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else
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plus3_->write(address, *value);
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}
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break;
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case 0xfc00:
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if(plus3_ && (address&0x00f0) == 0x00c0) {
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if(!isReadOperation(operation)) {
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plus3_->set_control_register(*value);
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} else *value = 1;
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}
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if(has_scsi_bus && (address&0x00f0) == 0x0040) {
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scsi_acknowledge_ = true;
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if(!isReadOperation(operation)) {
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scsi_data_ = *value;
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push_scsi_output();
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} else {
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*value = SCSI::data_lines(scsi_bus_.get_state());
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push_scsi_output();
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}
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}
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break;
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case 0xfc03:
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if(has_scsi_bus && (address&0x00f0) == 0x0040) {
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scsi_interrupt_state_ = false;
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scsi_interrupt_mask_ = *value & 1;
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evaluate_interrupts();
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}
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break;
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case 0xfc01:
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if(has_scsi_bus && (address&0x00f0) == 0x0040 && isReadOperation(operation)) {
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// Status byte is:
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//
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// b7: SCSI C/D
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// b6: SCSI I/O
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// b5: SCSI REQ
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// b4: interrupt flag
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// b3: 0
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// b2: 0
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// b1: SCSI BSY
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// b0: SCSI MSG
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const auto state = scsi_bus_.get_state();
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*value =
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(state & SCSI::Line::Control ? 0x80 : 0x00) |
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(state & SCSI::Line::Input ? 0x40 : 0x00) |
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(state & SCSI::Line::Request ? 0x20 : 0x00) |
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((scsi_interrupt_state_ && scsi_interrupt_mask_) ? 0x10 : 0x00) |
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(state & SCSI::Line::Busy ? 0x02 : 0x00) |
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(state & SCSI::Line::Message ? 0x01 : 0x00);
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// Empirical guess: this is also the trigger to affect busy/request/acknowledge
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// signalling. Maybe?
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if(scsi_select_ && scsi_bus_.get_state() & SCSI::Line::Busy) {
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scsi_select_ = false;
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push_scsi_output();
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}
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}
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break;
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case 0xfc02:
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if(has_scsi_bus && (address&0x00f0) == 0x0040) {
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scsi_select_ = true;
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push_scsi_output();
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}
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break;
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// SCSI locations:
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//
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// fc40: data, read and write
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// fc41: status read
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// fc42: select write
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// fc43: interrupt latch
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//
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//
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// Interrupt latch is:
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//
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// b0: enable or disable IRQ on REQ
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// (and, possibly, writing to the latch acknowledges?)
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default:
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if(address >= 0xc000) {
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if(isReadOperation(operation)) {
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if(
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use_fast_tape_hack_ &&
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(operation == CPU::MOS6502::BusOperation::ReadOpcode) &&
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(
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(address == 0xf4e5) || (address == 0xf4e6) || // double NOPs at 0xf4e5, 0xf6de, 0xf6fa and 0xfa51
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(address == 0xf6de) || (address == 0xf6df) || // act to disable the normal branch into tape-handling
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(address == 0xf6fa) || (address == 0xf6fb) || // code, forcing the OS along the serially-accessed ROM
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(address == 0xfa51) || (address == 0xfa52) || // pathway.
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(address == 0xf0a8) // 0xf0a8 is from where a service call would normally be
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// dispatched; we can check whether it would be call 14
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// (i.e. read byte) and, if so, whether the OS was about to
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// issue a read byte call to a ROM despite the tape
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// FS being selected. If so then this is a get byte that
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// we should service synthetically. Put the byte into Y
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// and set A to zero to report that action was taken, then
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// allow the PC read to return an RTS.
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)
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) {
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const auto service_call = uint8_t(m6502_.get_value_of_register(CPU::MOS6502::Register::X));
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if(address == 0xf0a8) {
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if(!ram_[0x247] && service_call == 14) {
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tape_.set_delegate(nullptr);
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int cycles_left_while_plausibly_in_data = 50;
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tape_.clear_interrupts(Interrupt::ReceiveDataFull);
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while(!tape_.get_tape()->is_at_end()) {
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tape_.run_for_input_pulse();
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--cycles_left_while_plausibly_in_data;
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if(!cycles_left_while_plausibly_in_data) fast_load_is_in_data_ = false;
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if( (tape_.get_interrupt_status() & Interrupt::ReceiveDataFull) &&
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(fast_load_is_in_data_ || tape_.get_data_register() == 0x2a)
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) break;
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}
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tape_.set_delegate(this);
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tape_.clear_interrupts(Interrupt::ReceiveDataFull);
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interrupt_status_ |= tape_.get_interrupt_status();
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fast_load_is_in_data_ = true;
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m6502_.set_value_of_register(CPU::MOS6502::Register::A, 0);
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m6502_.set_value_of_register(CPU::MOS6502::Register::Y, tape_.get_data_register());
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*value = 0x60; // 0x60 is RTS
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}
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else *value = os_[address & 16383];
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}
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else *value = 0xea;
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} else {
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*value = os_[address & 16383];
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}
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}
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} else {
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if(isReadOperation(operation)) {
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*value = roms_[active_rom_][address & 16383];
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if(keyboard_is_active_) {
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*value &= 0xf0;
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for(int address_line = 0; address_line < 14; address_line++) {
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if(!(address&(1 << address_line))) *value |= key_states_[address_line];
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}
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}
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if(basic_is_active_) {
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*value &= roms_[int(ROM::BASIC)][address & 16383];
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}
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} else if(rom_write_masks_[active_rom_]) {
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roms_[active_rom_][address & 16383] = *value;
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}
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}
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break;
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}
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}
|
|
|
|
if(video_ += Cycles(int(cycles))) {
|
|
signal_interrupt(video_.last_valid()->get_interrupts());
|
|
}
|
|
|
|
cycles_since_audio_update_ += Cycles(int(cycles));
|
|
if(cycles_since_audio_update_ > Cycles(16384)) update_audio();
|
|
tape_.run_for(Cycles(int(cycles)));
|
|
|
|
if(typer_) typer_->run_for(Cycles(int(cycles)));
|
|
if(plus3_) plus3_->run_for(Cycles(4*int(cycles)));
|
|
if(shift_restart_counter_) {
|
|
shift_restart_counter_ -= cycles;
|
|
if(shift_restart_counter_ <= 0) {
|
|
shift_restart_counter_ = 0;
|
|
m6502_.set_power_on(true);
|
|
set_key_state(KeyShift, true);
|
|
is_holding_shift_ = true;
|
|
}
|
|
}
|
|
|
|
if constexpr (has_scsi_bus) {
|
|
if(scsi_is_clocked_) {
|
|
scsi_bus_.run_for(Cycles(int(cycles)));
|
|
}
|
|
}
|
|
|
|
return Cycles(int(cycles));
|
|
}
|
|
|
|
forceinline void flush() {
|
|
video_.flush();
|
|
update_audio();
|
|
audio_queue_.perform();
|
|
}
|
|
|
|
void set_scan_target(Outputs::Display::ScanTarget *scan_target) final {
|
|
video_.last_valid()->set_scan_target(scan_target);
|
|
}
|
|
|
|
Outputs::Display::ScanStatus get_scaled_scan_status() const final {
|
|
return video_.last_valid()->get_scaled_scan_status();
|
|
}
|
|
|
|
void set_display_type(Outputs::Display::DisplayType display_type) final {
|
|
video_.last_valid()->set_display_type(display_type);
|
|
}
|
|
|
|
Outputs::Display::DisplayType get_display_type() const final {
|
|
return video_.last_valid()->get_display_type();
|
|
}
|
|
|
|
Outputs::Speaker::Speaker *get_speaker() final {
|
|
return &speaker_;
|
|
}
|
|
|
|
void run_for(const Cycles cycles) final {
|
|
m6502_.run_for(cycles);
|
|
}
|
|
|
|
void scsi_bus_did_change(SCSI::Bus *, SCSI::BusState new_state, double) final {
|
|
// Release acknowledge when request is released.
|
|
if(scsi_acknowledge_ && !(new_state & SCSI::Line::Request)) {
|
|
scsi_acknowledge_ = false;
|
|
push_scsi_output();
|
|
}
|
|
|
|
// Output occurs only while SCSI::Line::Input is inactive; therefore a change
|
|
// in that line affects what's on the bus.
|
|
if(((new_state^previous_bus_state_)&SCSI::Line::Input)) {
|
|
push_scsi_output();
|
|
}
|
|
|
|
scsi_interrupt_state_ |= (new_state^previous_bus_state_)&new_state & SCSI::Line::Request;
|
|
previous_bus_state_ = new_state;
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
void set_component_prefers_clocking(ClockingHint::Source *, ClockingHint::Preference preference) final {
|
|
scsi_is_clocked_ = preference != ClockingHint::Preference::None;
|
|
}
|
|
|
|
void tape_did_change_interrupt_status(Tape *) final {
|
|
interrupt_status_ = (interrupt_status_ & ~(Interrupt::TransmitDataEmpty | Interrupt::ReceiveDataFull | Interrupt::HighToneDetect)) | tape_.get_interrupt_status();
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
HalfCycles get_typer_delay(const std::string &text) const final {
|
|
if(!m6502_.get_is_resetting()) {
|
|
return Cycles(0);
|
|
}
|
|
|
|
// Add a longer delay for a command at reset that involves pressing a modifier;
|
|
// empirically this seems to be a requirement, in order to avoid a collision with
|
|
// the system's built-in modifier-at-startup test (e.g. to perform shift+break).
|
|
CharacterMapper test_mapper;
|
|
const uint16_t *const sequence = test_mapper.sequence_for_character(text[0]);
|
|
return is_modifier(Key(sequence[0])) ? Cycles(1'000'000) : Cycles(750'000);
|
|
}
|
|
|
|
HalfCycles get_typer_frequency() const final {
|
|
return Cycles(60'000);
|
|
}
|
|
|
|
void type_string(const std::string &string) final {
|
|
Utility::TypeRecipient<CharacterMapper>::add_typer(string);
|
|
}
|
|
|
|
bool can_type(char c) const final {
|
|
return Utility::TypeRecipient<CharacterMapper>::can_type(c);
|
|
}
|
|
|
|
KeyboardMapper *get_keyboard_mapper() final {
|
|
return &keyboard_mapper_;
|
|
}
|
|
|
|
// MARK: - Configuration options.
|
|
std::unique_ptr<Reflection::Struct> get_options() final {
|
|
auto options = std::make_unique<Options>(Configurable::OptionsType::UserFriendly);
|
|
options->output = get_video_signal_configurable();
|
|
options->quickload = allow_fast_tape_hack_;
|
|
return options;
|
|
}
|
|
|
|
void set_options(const std::unique_ptr<Reflection::Struct> &str) final {
|
|
const auto options = dynamic_cast<Options *>(str.get());
|
|
|
|
set_video_signal_configurable(options->output);
|
|
allow_fast_tape_hack_ = options->quickload;
|
|
set_use_fast_tape_hack();
|
|
}
|
|
|
|
// MARK: - Activity Source
|
|
void set_activity_observer(Activity::Observer *observer) final {
|
|
activity_observer_ = observer;
|
|
if(activity_observer_) {
|
|
activity_observer_->register_led(caps_led, Activity::Observer::LEDPresentation::Persistent);
|
|
activity_observer_->set_led_status(caps_led, caps_led_state_);
|
|
}
|
|
|
|
if(plus3_) {
|
|
plus3_->set_activity_observer(observer);
|
|
}
|
|
|
|
if(has_scsi_bus) {
|
|
scsi_bus_.set_activity_observer(observer);
|
|
}
|
|
}
|
|
|
|
private:
|
|
enum class ROM {
|
|
Slot0 = 0,
|
|
Slot1, Slot2, Slot3,
|
|
Slot4, Slot5, Slot6, Slot7,
|
|
|
|
Keyboard = 8, Slot9,
|
|
BASIC = 10, Slot11,
|
|
|
|
Slot12, Slot13, Slot14, Slot15,
|
|
|
|
OS, DFS,
|
|
ADFS1, ADFS2
|
|
};
|
|
|
|
/*!
|
|
Sets the contents of @c slot to @c data. If @c is_writeable is @c true then writing to the slot
|
|
is enabled: it acts as if it were sideways RAM. Otherwise the slot is modelled as containing ROM.
|
|
*/
|
|
void set_rom(ROM slot, const std::vector<uint8_t> &data, bool is_writeable) {
|
|
uint8_t *target = nullptr;
|
|
switch(slot) {
|
|
case ROM::DFS: dfs_ = data; return;
|
|
case ROM::ADFS1: adfs1_ = data; return;
|
|
case ROM::ADFS2: adfs2_ = data; return;
|
|
|
|
case ROM::OS: target = os_; break;
|
|
default:
|
|
target = roms_[int(slot)];
|
|
rom_write_masks_[int(slot)] = is_writeable;
|
|
break;
|
|
}
|
|
|
|
// Copy in, with mirroring.
|
|
std::size_t rom_ptr = 0;
|
|
while(rom_ptr < 16384) {
|
|
std::size_t size_to_copy = std::min(16384 - rom_ptr, data.size());
|
|
std::memcpy(&target[rom_ptr], data.data(), size_to_copy);
|
|
rom_ptr += size_to_copy;
|
|
}
|
|
|
|
if(int(slot) < 16) {
|
|
rom_inserted_[int(slot)] = true;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
Enables @c slot as sideways RAM; ensures that it does not currently contain a valid ROM signature.
|
|
*/
|
|
void set_sideways_ram(ROM slot) {
|
|
std::memset(roms_[int(slot)], 0xff, 16*1024);
|
|
if(int(slot) < 16) {
|
|
rom_inserted_[int(slot)] = true;
|
|
rom_write_masks_[int(slot)] = true;
|
|
}
|
|
}
|
|
|
|
// MARK: - Work deferral updates.
|
|
inline void update_audio() {
|
|
speaker_.run_for(audio_queue_, cycles_since_audio_update_.divide(Cycles(SoundGenerator::clock_rate_divider)));
|
|
}
|
|
|
|
inline void signal_interrupt(Interrupt interrupt) {
|
|
interrupt_status_ |= interrupt;
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
inline void clear_interrupt(Interrupt interrupt) {
|
|
interrupt_status_ &= ~interrupt;
|
|
evaluate_interrupts();
|
|
}
|
|
|
|
inline void evaluate_interrupts() {
|
|
if(interrupt_status_ & interrupt_control_) {
|
|
interrupt_status_ |= 1;
|
|
} else {
|
|
interrupt_status_ &= ~1;
|
|
}
|
|
|
|
if constexpr (has_scsi_bus) {
|
|
m6502_.set_irq_line((scsi_interrupt_state_ && scsi_interrupt_mask_) | (interrupt_status_ & 1));
|
|
} else {
|
|
m6502_.set_irq_line(interrupt_status_ & 1);
|
|
}
|
|
}
|
|
|
|
CPU::MOS6502::Processor<CPU::MOS6502::Personality::P6502, ConcreteMachine, false> m6502_;
|
|
|
|
// Things that directly constitute the memory map.
|
|
uint8_t roms_[16][16384];
|
|
bool rom_inserted_[16] = {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false};
|
|
bool rom_write_masks_[16] = {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false};
|
|
uint8_t os_[16384], ram_[32768];
|
|
std::vector<uint8_t> dfs_, adfs1_, adfs2_;
|
|
|
|
// Paging
|
|
int active_rom_ = int(ROM::Slot0);
|
|
bool keyboard_is_active_ = false;
|
|
bool basic_is_active_ = false;
|
|
|
|
// Interrupt and keyboard state
|
|
uint8_t interrupt_status_ = Interrupt::PowerOnReset | Interrupt::TransmitDataEmpty | 0x80;
|
|
uint8_t interrupt_control_ = 0;
|
|
uint8_t key_states_[14];
|
|
Electron::KeyboardMapper keyboard_mapper_;
|
|
|
|
// Counters related to simultaneous subsystems
|
|
Cycles cycles_since_audio_update_ = 0;
|
|
VideoOutput::Range video_access_range_ = {0, 0xffff};
|
|
|
|
// Tape
|
|
Tape tape_;
|
|
bool use_fast_tape_hack_ = false;
|
|
bool allow_fast_tape_hack_ = false;
|
|
void set_use_fast_tape_hack() {
|
|
use_fast_tape_hack_ = allow_fast_tape_hack_ && tape_.has_tape();
|
|
}
|
|
bool fast_load_is_in_data_ = false;
|
|
|
|
// Disk
|
|
std::unique_ptr<Plus3> plus3_;
|
|
bool is_holding_shift_ = false;
|
|
int shift_restart_counter_ = 0;
|
|
|
|
// Hard drive.
|
|
SCSI::Bus scsi_bus_;
|
|
SCSI::Target::Target<SCSI::DirectAccessDevice> hard_drive_;
|
|
SCSI::BusState previous_bus_state_ = SCSI::DefaultBusState;
|
|
const size_t scsi_device_ = 0;
|
|
uint8_t scsi_data_ = 0;
|
|
bool scsi_select_ = false;
|
|
bool scsi_acknowledge_ = false;
|
|
bool scsi_is_clocked_ = false;
|
|
bool scsi_interrupt_state_ = false;
|
|
bool scsi_interrupt_mask_ = false;
|
|
void push_scsi_output() {
|
|
scsi_bus_.set_device_output(scsi_device_,
|
|
(scsi_bus_.get_state()&SCSI::Line::Input ? 0 : scsi_data_) |
|
|
(scsi_select_ ? SCSI::Line::SelectTarget : 0) |
|
|
(scsi_acknowledge_ ? SCSI::Line::Acknowledge : 0)
|
|
);
|
|
}
|
|
|
|
// Outputs
|
|
JustInTimeActor<VideoOutput, Cycles> video_;
|
|
|
|
Concurrency::DeferringAsyncTaskQueue audio_queue_;
|
|
SoundGenerator sound_generator_;
|
|
Outputs::Speaker::LowpassSpeaker<SoundGenerator> speaker_;
|
|
|
|
bool speaker_is_enabled_ = false;
|
|
|
|
// MARK: - Caps Lock status and the activity observer.
|
|
const std::string caps_led = "CAPS";
|
|
bool caps_led_state_ = false;
|
|
Activity::Observer *activity_observer_ = nullptr;
|
|
};
|
|
|
|
}
|
|
|
|
using namespace Electron;
|
|
|
|
Machine *Machine::Electron(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
|
|
using Target = Analyser::Static::Acorn::Target;
|
|
const Target *const acorn_target = dynamic_cast<const Target *>(target);
|
|
|
|
if(acorn_target->media.mass_storage_devices.empty()) {
|
|
return new Electron::ConcreteMachine<false>(*acorn_target, rom_fetcher);
|
|
} else {
|
|
return new Electron::ConcreteMachine<true>(*acorn_target, rom_fetcher);
|
|
}
|
|
}
|
|
|
|
Machine::~Machine() {}
|