mirror of
https://github.com/TomHarte/CLK.git
synced 2024-08-24 23:29:00 +00:00
This fully implements the NES 6502 because, well, it's virtually no extra work, and ensures that RDY takes effect on write cycles on 65C02s.
611 lines
19 KiB
C++
611 lines
19 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 "../MediaTarget.hpp"
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#include "../CRTMachine.hpp"
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#include "../KeyboardMachine.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/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 "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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std::vector<std::unique_ptr<Configurable::Option>> get_options() {
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return Configurable::standard_options(
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static_cast<Configurable::StandardOptions>(Configurable::DisplayRGB | Configurable::DisplayComposite | Configurable::QuickLoadTape)
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);
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}
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class ConcreteMachine:
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public Machine,
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public CRTMachine::Machine,
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public MediaTarget::Machine,
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public KeyboardMachine::Machine,
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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,
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public Activity::Source {
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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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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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std::vector<std::string> rom_names = {"basic.rom", "os.rom"};
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if(target.has_adfs) {
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rom_names.push_back("ADFS-E00_1.rom");
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rom_names.push_back("ADFS-E00_2.rom");
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}
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const size_t dfs_rom_position = rom_names.size();
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if(target.has_dfs) {
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rom_names.push_back("DFS-1770-2.20.rom");
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}
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const auto roms = rom_fetcher("Electron", rom_names);
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for(const auto &rom: roms) {
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if(!rom) {
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throw ROMMachine::Error::MissingROMs;
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}
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}
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set_rom(ROM::BASIC, *roms[0], false);
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set_rom(ROM::OS, *roms[1], false);
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if(target.has_dfs || target.has_adfs) {
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plus3_.reset(new Plus3);
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if(target.has_dfs) {
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set_rom(ROM::Slot0, *roms[dfs_rom_position], true);
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}
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if(target.has_adfs) {
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set_rom(ROM::Slot4, *roms[2], true);
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set_rom(ROM::Slot5, *roms[3], true);
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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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}
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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) override final {
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if(key == KeyBreak) {
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m6502_.set_reset_line(isPressed);
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} else {
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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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}
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}
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void clear_all_keys() override 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) override 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_[static_cast<int>(slot)]) {
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slot = static_cast<ROM>((static_cast<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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return !media.tapes.empty() || !media.disks.empty() || !media.cartridges.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) update_display();
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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_output_->get_cycles_until_next_ram_availability(cycles_since_display_update_.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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// deliberate 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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update_display();
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video_output_->set_register(address, *value);
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video_access_range_ = video_output_->get_memory_access_range();
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queue_next_display_interrupt();
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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_->get_register(address);
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else
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plus3_->set_register(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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break;
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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 being 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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uint8_t service_call = static_cast<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_[static_cast<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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}
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cycles_since_display_update_ += Cycles(static_cast<int>(cycles));
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cycles_since_audio_update_ += Cycles(static_cast<int>(cycles));
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if(cycles_since_audio_update_ > Cycles(16384)) update_audio();
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tape_.run_for(Cycles(static_cast<int>(cycles)));
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cycles_until_display_interrupt_ -= cycles;
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if(cycles_until_display_interrupt_ < 0) {
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signal_interrupt(next_display_interrupt_);
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update_display();
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queue_next_display_interrupt();
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}
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if(typer_) typer_->run_for(Cycles(static_cast<int>(cycles)));
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if(plus3_) plus3_->run_for(Cycles(4*static_cast<int>(cycles)));
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if(shift_restart_counter_) {
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shift_restart_counter_ -= cycles;
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if(shift_restart_counter_ <= 0) {
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shift_restart_counter_ = 0;
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m6502_.set_power_on(true);
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set_key_state(KeyShift, true);
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is_holding_shift_ = true;
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}
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}
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return Cycles(static_cast<int>(cycles));
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}
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forceinline void flush() {
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update_display();
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update_audio();
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audio_queue_.perform();
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}
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void setup_output(float aspect_ratio) override final {
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video_output_.reset(new VideoOutput(ram_));
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}
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void close_output() override final {
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video_output_.reset();
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}
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Outputs::CRT::CRT *get_crt() override final {
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return video_output_->get_crt();
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}
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Outputs::Speaker::Speaker *get_speaker() override final {
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return &speaker_;
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}
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void run_for(const Cycles cycles) override final {
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m6502_.run_for(cycles);
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}
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void tape_did_change_interrupt_status(Tape *tape) override final {
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interrupt_status_ = (interrupt_status_ & ~(Interrupt::TransmitDataEmpty | Interrupt::ReceiveDataFull | Interrupt::HighToneDetect)) | tape_.get_interrupt_status();
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evaluate_interrupts();
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}
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HalfCycles get_typer_delay() override final {
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return m6502_.get_is_resetting() ? Cycles(625*25*128) : Cycles(0); // wait one second if resetting
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}
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HalfCycles get_typer_frequency() override final {
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return Cycles(625*128*2); // accept a new character every two frames
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}
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void type_string(const std::string &string) override final {
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std::unique_ptr<CharacterMapper> mapper(new CharacterMapper());
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Utility::TypeRecipient::add_typer(string, std::move(mapper));
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}
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KeyboardMapper *get_keyboard_mapper() override {
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return &keyboard_mapper_;
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}
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// MARK: - Configuration options.
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std::vector<std::unique_ptr<Configurable::Option>> get_options() override {
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return Electron::get_options();
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}
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void set_selections(const Configurable::SelectionSet &selections_by_option) override {
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bool quickload;
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if(Configurable::get_quick_load_tape(selections_by_option, quickload)) {
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allow_fast_tape_hack_ = quickload;
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set_use_fast_tape_hack();
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}
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Configurable::Display display;
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if(Configurable::get_display(selections_by_option, display)) {
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set_video_signal_configurable(display);
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}
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}
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Configurable::SelectionSet get_accurate_selections() override {
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Configurable::SelectionSet selection_set;
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Configurable::append_quick_load_tape_selection(selection_set, false);
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Configurable::append_display_selection(selection_set, Configurable::Display::Composite);
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return selection_set;
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}
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Configurable::SelectionSet get_user_friendly_selections() override {
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Configurable::SelectionSet selection_set;
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Configurable::append_quick_load_tape_selection(selection_set, true);
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Configurable::append_display_selection(selection_set, Configurable::Display::RGB);
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return selection_set;
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}
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// MARK: - Activity Source
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void set_activity_observer(Activity::Observer *observer) override {
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activity_observer_ = observer;
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if(activity_observer_) {
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activity_observer_->register_led(caps_led);
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activity_observer_->set_led_status(caps_led, caps_led_state_);
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if(plus3_) {
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plus3_->set_activity_observer(observer);
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}
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}
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}
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private:
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enum class ROM {
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Slot0 = 0,
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Slot1, Slot2, Slot3,
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Slot4, Slot5, Slot6, Slot7,
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Keyboard = 8, Slot9,
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BASIC = 10, Slot11,
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Slot12, Slot13, Slot14, Slot15,
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OS, DFS,
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ADFS1, ADFS2
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};
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/*!
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Sets the contents of @c slot to @c data. If @c is_writeable is @c true then writing to the slot
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is enabled: it acts as if it were sideways RAM. Otherwise the slot is modelled as containing ROM.
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*/
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void set_rom(ROM slot, const std::vector<uint8_t> &data, bool is_writeable) {
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uint8_t *target = nullptr;
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|
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_[static_cast<int>(slot)];
|
|
rom_write_masks_[static_cast<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(static_cast<int>(slot) < 16)
|
|
rom_inserted_[static_cast<int>(slot)] = true;
|
|
}
|
|
|
|
// MARK: - Work deferral updates.
|
|
inline void update_display() {
|
|
if(cycles_since_display_update_ > 0) {
|
|
video_output_->run_for(cycles_since_display_update_.flush());
|
|
}
|
|
}
|
|
|
|
inline void queue_next_display_interrupt() {
|
|
VideoOutput::Interrupt next_interrupt = video_output_->get_next_interrupt();
|
|
cycles_until_display_interrupt_ = next_interrupt.cycles;
|
|
next_display_interrupt_ = next_interrupt.interrupt;
|
|
}
|
|
|
|
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;
|
|
}
|
|
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_ = static_cast<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_display_update_ = 0;
|
|
Cycles cycles_since_audio_update_ = 0;
|
|
int cycles_until_display_interrupt_ = 0;
|
|
Interrupt next_display_interrupt_ = Interrupt::RealTimeClock;
|
|
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;
|
|
|
|
// Outputs
|
|
std::unique_ptr<VideoOutput> video_output_;
|
|
|
|
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);
|
|
return new Electron::ConcreteMachine(*acorn_target, rom_fetcher);
|
|
}
|
|
|
|
Machine::~Machine() {}
|