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417 lines
13 KiB
C++
417 lines
13 KiB
C++
//
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// ColecoVision.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 23/02/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "ColecoVision.hpp"
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#include "../../Processors/Z80/Z80.hpp"
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#include "../../Components/9918/9918.hpp"
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#include "../../Components/AY38910/AY38910.hpp" // For the Super Game Module.
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#include "../../Components/SN76489/SN76489.hpp"
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#include "../MachineTypes.hpp"
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#include "../../Configurable/Configurable.hpp"
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#include "../../Configurable/StandardOptions.hpp"
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#include "../../ClockReceiver/ForceInline.hpp"
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#include "../../ClockReceiver/JustInTime.hpp"
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#include "../../Outputs/Speaker/Implementation/CompoundSource.hpp"
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#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
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#include "../../Analyser/Dynamic/ConfidenceCounter.hpp"
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namespace {
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constexpr int sn76489_divider = 2;
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}
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namespace Coleco {
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namespace Vision {
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class Joystick: public Inputs::ConcreteJoystick {
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public:
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Joystick() :
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ConcreteJoystick({
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Input(Input::Up),
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Input(Input::Down),
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Input(Input::Left),
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Input(Input::Right),
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Input(Input::Fire, 0),
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Input(Input::Fire, 1),
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Input('0'), Input('1'), Input('2'),
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Input('3'), Input('4'), Input('5'),
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Input('6'), Input('7'), Input('8'),
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Input('9'), Input('*'), Input('#'),
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}) {}
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void did_set_input(const Input &digital_input, bool is_active) final {
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switch(digital_input.type) {
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default: return;
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case Input::Key:
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if(!is_active) keypad_ |= 0xf;
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else {
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uint8_t mask = 0xf;
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switch(digital_input.info.key.symbol) {
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case '8': mask = 0x1; break;
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case '4': mask = 0x2; break;
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case '5': mask = 0x3; break;
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case '7': mask = 0x5; break;
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case '#': mask = 0x6; break;
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case '2': mask = 0x7; break;
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case '*': mask = 0x9; break;
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case '0': mask = 0xa; break;
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case '9': mask = 0xb; break;
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case '3': mask = 0xc; break;
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case '1': mask = 0xd; break;
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case '6': mask = 0xe; break;
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default: break;
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}
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keypad_ = (keypad_ & 0xf0) | mask;
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}
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break;
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case Input::Up: if(is_active) direction_ &= ~0x01; else direction_ |= 0x01; break;
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case Input::Right: if(is_active) direction_ &= ~0x02; else direction_ |= 0x02; break;
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case Input::Down: if(is_active) direction_ &= ~0x04; else direction_ |= 0x04; break;
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case Input::Left: if(is_active) direction_ &= ~0x08; else direction_ |= 0x08; break;
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case Input::Fire:
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switch(digital_input.info.control.index) {
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default: break;
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case 0: if(is_active) direction_ &= ~0x40; else direction_ |= 0x40; break;
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case 1: if(is_active) keypad_ &= ~0x40; else keypad_ |= 0x40; break;
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}
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break;
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}
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}
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uint8_t get_direction_input() {
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return direction_;
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}
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uint8_t get_keypad_input() {
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return keypad_;
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}
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private:
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uint8_t direction_ = 0xff;
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uint8_t keypad_ = 0x7f;
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};
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class ConcreteMachine:
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public Machine,
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public CPU::Z80::BusHandler,
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public Configurable::Device,
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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::JoystickMachine {
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public:
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ConcreteMachine(const Analyser::Static::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
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z80_(*this),
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vdp_(TI::TMS::TMS9918A),
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sn76489_(TI::SN76489::Personality::SN76489, audio_queue_, sn76489_divider),
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ay_(GI::AY38910::Personality::AY38910, audio_queue_),
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mixer_(sn76489_, ay_),
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speaker_(mixer_) {
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speaker_.set_input_rate(3579545.0f / float(sn76489_divider));
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set_clock_rate(3579545);
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joysticks_.emplace_back(new Joystick);
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joysticks_.emplace_back(new Joystick);
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constexpr ROM::Name rom_name = ROM::Name::ColecoVisionBIOS;
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const ROM::Request request(rom_name);
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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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bios_ = roms.find(rom_name)->second;
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if(!target.media.cartridges.empty()) {
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const auto &segment = target.media.cartridges.front()->get_segments().front();
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cartridge_ = segment.data;
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if(cartridge_.size() >= 32768)
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cartridge_address_limit_ = 0xffff;
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else
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cartridge_address_limit_ = uint16_t(0x8000 + cartridge_.size() - 1);
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if(cartridge_.size() > 32768) {
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// Ensure the cartrige is a multiple of 16kb in size, as that won't
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// be checked when paging.
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const size_t extension = (16384 - (cartridge_.size() & 16383)) % 16384;
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cartridge_.resize(cartridge_.size() + extension);
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cartridge_pages_[0] = &cartridge_[cartridge_.size() - 16384];
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cartridge_pages_[1] = cartridge_.data();
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is_megacart_ = true;
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} else {
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// Ensure at least 32kb is allocated to the cartrige so that
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// reads are never out of bounds.
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cartridge_.resize(32768);
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cartridge_pages_[0] = cartridge_.data();
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cartridge_pages_[1] = cartridge_.data() + 16384;
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is_megacart_ = false;
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}
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}
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// ColecoVisions have composite output only.
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vdp_->set_display_type(Outputs::Display::DisplayType::CompositeColour);
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}
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~ConcreteMachine() {
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audio_queue_.flush();
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}
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const std::vector<std::unique_ptr<Inputs::Joystick>> &get_joysticks() final {
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return joysticks_;
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}
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void set_scan_target(Outputs::Display::ScanTarget *scan_target) final {
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vdp_->set_scan_target(scan_target);
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}
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Outputs::Display::ScanStatus get_scaled_scan_status() const final {
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return vdp_->get_scaled_scan_status();
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}
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void set_display_type(Outputs::Display::DisplayType display_type) final {
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vdp_->set_display_type(display_type);
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}
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Outputs::Display::DisplayType get_display_type() const final {
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return vdp_->get_display_type();
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}
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Outputs::Speaker::Speaker *get_speaker() final {
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return &speaker_;
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}
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void run_for(const Cycles cycles) final {
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z80_.run_for(cycles);
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}
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// MARK: Z80::BusHandler
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forceinline HalfCycles perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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// The SN76489 will use its ready line to trigger the Z80's wait, which will add
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// thirty-one (!) cycles when accessed. M1 cycles are extended by a single cycle.
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// This code works out the delay up front in order to simplify execution flow, though
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// technically this is a little duplicative.
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HalfCycles penalty(0);
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if(cycle.operation == CPU::Z80::PartialMachineCycle::Output && ((*cycle.address >> 5) & 7) == 7) {
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penalty = HalfCycles(62);
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} else if(cycle.operation == CPU::Z80::PartialMachineCycle::ReadOpcode) {
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penalty = HalfCycles(2);
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}
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const HalfCycles length = cycle.length + penalty;
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if(vdp_ += length) {
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z80_.set_non_maskable_interrupt_line(vdp_->get_interrupt_line());
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}
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time_since_sn76489_update_ += length;
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// Act only if necessary.
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if(cycle.is_terminal()) {
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uint16_t address = cycle.address ? *cycle.address : 0x0000;
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switch(cycle.operation) {
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case CPU::Z80::PartialMachineCycle::ReadOpcode:
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if(!address) pc_zero_accesses_++;
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[[fallthrough]];
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case CPU::Z80::PartialMachineCycle::Read:
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if(address < 0x2000) {
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if(super_game_module_.replace_bios) {
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*cycle.value = super_game_module_.ram[address];
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} else {
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*cycle.value = bios_[address];
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}
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} else if(super_game_module_.replace_ram && address < 0x8000) {
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*cycle.value = super_game_module_.ram[address];
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} else if(address >= 0x6000 && address < 0x8000) {
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*cycle.value = ram_[address & 1023];
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} else if(address >= 0x8000 && address <= cartridge_address_limit_) {
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if(is_megacart_ && address >= 0xffc0) {
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page_megacart(address);
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}
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*cycle.value = cartridge_pages_[(address >> 14)&1][address&0x3fff];
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} else {
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*cycle.value = 0xff;
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}
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break;
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case CPU::Z80::PartialMachineCycle::Write:
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if(super_game_module_.replace_bios && address < 0x2000) {
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super_game_module_.ram[address] = *cycle.value;
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} else if(super_game_module_.replace_ram && address >= 0x2000 && address < 0x8000) {
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super_game_module_.ram[address] = *cycle.value;
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} else if(address >= 0x6000 && address < 0x8000) {
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ram_[address & 1023] = *cycle.value;
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} else if(is_megacart_ && address >= 0xffc0) {
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page_megacart(address);
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}
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break;
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case CPU::Z80::PartialMachineCycle::Input:
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switch((address >> 5) & 7) {
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case 5:
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*cycle.value = vdp_->read(address);
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z80_.set_non_maskable_interrupt_line(vdp_->get_interrupt_line());
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break;
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case 7: {
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const std::size_t joystick_id = (address&2) >> 1;
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Joystick *joystick = static_cast<Joystick *>(joysticks_[joystick_id].get());
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if(joysticks_in_keypad_mode_) {
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*cycle.value = joystick->get_keypad_input();
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} else {
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*cycle.value = joystick->get_direction_input();
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}
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// Hitting exactly the recommended joypad input port is an indicator that
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// this really is a ColecoVision game. The BIOS won't do this when just waiting
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// to start a game (unlike accessing the VDP and SN).
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if((address&0xfc) == 0xfc) confidence_counter_.add_hit();
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} break;
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default:
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switch(address&0xff) {
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default: *cycle.value = 0xff; break;
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case 0x52:
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// Read AY data.
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update_audio();
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*cycle.value = GI::AY38910::Utility::read(ay_);
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break;
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}
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break;
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}
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break;
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case CPU::Z80::PartialMachineCycle::Output: {
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const int eighth = (address >> 5) & 7;
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switch(eighth) {
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case 4: case 6:
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joysticks_in_keypad_mode_ = eighth == 4;
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break;
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case 5:
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vdp_->write(address, *cycle.value);
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z80_.set_non_maskable_interrupt_line(vdp_->get_interrupt_line());
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break;
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case 7:
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update_audio();
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sn76489_.write(*cycle.value);
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break;
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default:
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// Catch Super Game Module accesses; it decodes more thoroughly.
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switch(address&0xff) {
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default: break;
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case 0x7f:
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super_game_module_.replace_bios = !((*cycle.value)&0x2);
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break;
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case 0x50:
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// Set AY address.
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update_audio();
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GI::AY38910::Utility::select_register(ay_, *cycle.value);
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break;
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case 0x51:
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// Set AY data.
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update_audio();
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GI::AY38910::Utility::write_data(ay_, *cycle.value);
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break;
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case 0x53:
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super_game_module_.replace_ram = !!((*cycle.value)&0x1);
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break;
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}
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break;
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}
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} break;
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default: break;
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}
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}
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return penalty;
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}
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void flush() {
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vdp_.flush();
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update_audio();
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audio_queue_.perform();
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}
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float get_confidence() final {
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if(pc_zero_accesses_ > 1) return 0.0f;
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return confidence_counter_.get_confidence();
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}
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// MARK: - Configuration options.
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std::unique_ptr<Reflection::Struct> get_options() final {
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auto options = std::make_unique<Options>(Configurable::OptionsType::UserFriendly);
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options->output = get_video_signal_configurable();
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return options;
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}
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void set_options(const std::unique_ptr<Reflection::Struct> &str) final {
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const auto options = dynamic_cast<Options *>(str.get());
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set_video_signal_configurable(options->output);
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}
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private:
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inline void page_megacart(uint16_t address) {
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const std::size_t selected_start = (size_t(address&63) << 14) % cartridge_.size();
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cartridge_pages_[1] = &cartridge_[selected_start];
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}
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inline void update_audio() {
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speaker_.run_for(audio_queue_, time_since_sn76489_update_.divide_cycles(Cycles(sn76489_divider)));
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}
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CPU::Z80::Processor<ConcreteMachine, false, false> z80_;
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JustInTimeActor<TI::TMS::TMS9918> vdp_;
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Concurrency::DeferringAsyncTaskQueue audio_queue_;
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TI::SN76489 sn76489_;
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GI::AY38910::AY38910<false> ay_;
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Outputs::Speaker::CompoundSource<TI::SN76489, GI::AY38910::AY38910<false>> mixer_;
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Outputs::Speaker::LowpassSpeaker<Outputs::Speaker::CompoundSource<TI::SN76489, GI::AY38910::AY38910<false>>> speaker_;
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std::vector<uint8_t> bios_;
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std::vector<uint8_t> cartridge_;
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uint8_t *cartridge_pages_[2];
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uint8_t ram_[1024];
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bool is_megacart_ = false;
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uint16_t cartridge_address_limit_ = 0;
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struct {
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bool replace_bios = false;
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bool replace_ram = false;
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uint8_t ram[32768];
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} super_game_module_;
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std::vector<std::unique_ptr<Inputs::Joystick>> joysticks_;
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bool joysticks_in_keypad_mode_ = false;
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HalfCycles time_since_sn76489_update_;
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Analyser::Dynamic::ConfidenceCounter confidence_counter_;
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int pc_zero_accesses_ = 0;
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};
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}
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}
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using namespace Coleco::Vision;
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Machine *Machine::ColecoVision(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
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return new ConcreteMachine(*target, rom_fetcher);
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}
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Machine::~Machine() {}
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