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285 lines
7.9 KiB
C++
285 lines
7.9 KiB
C++
//
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// Oric.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 11/10/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Oric.hpp"
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#include "../MemoryFuzzer.hpp"
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using namespace Oric;
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Machine::Machine() :
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use_fast_tape_hack_(false),
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typer_delay_(2500000),
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keyboard_read_count_(0),
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keyboard_(new Keyboard),
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ram_top_(0xbfff),
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paged_rom_(rom_),
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microdisc_is_enabled_(false) {
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set_clock_rate(1000000);
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via_.set_interrupt_delegate(this);
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via_.keyboard = keyboard_;
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clear_all_keys();
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via_.tape->set_delegate(this);
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Memory::Fuzz(ram_, sizeof(ram_));
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}
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void Machine::configure_as_target(const StaticAnalyser::Target &target) {
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if(target.tapes.size()) {
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via_.tape->set_tape(target.tapes.front());
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}
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if(target.loadingCommand.length()) { // TODO: and automatic loading option enabled
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set_typer_for_string(target.loadingCommand.c_str());
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}
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if(target.oric.has_microdisc) {
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microdisc_is_enabled_ = true;
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microdisc_did_change_paging_flags(µdisc_);
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microdisc_.set_delegate(this);
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}
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int drive_index = 0;
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for(auto disk : target.disks) {
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if(drive_index < 4) microdisc_.set_disk(disk, drive_index);
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drive_index++;
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}
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if(target.oric.use_atmos_rom) {
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memcpy(rom_, basic11_rom_.data(), std::min(basic11_rom_.size(), sizeof(rom_)));
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is_using_basic11_ = true;
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tape_get_byte_address_ = 0xe6c9;
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scan_keyboard_address_ = 0xf495;
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tape_speed_address_ = 0x024d;
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} else {
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memcpy(rom_, basic10_rom_.data(), std::min(basic10_rom_.size(), sizeof(rom_)));
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is_using_basic11_ = false;
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tape_get_byte_address_ = 0xe630;
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scan_keyboard_address_ = 0xf43c;
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tape_speed_address_ = 0x67;
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}
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}
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void Machine::set_rom(ROM rom, const std::vector<uint8_t> &data) {
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switch(rom) {
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case BASIC11: basic11_rom_ = std::move(data); break;
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case BASIC10: basic10_rom_ = std::move(data); break;
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case Microdisc: microdisc_rom_ = std::move(data); break;
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case Colour:
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colour_rom_ = std::move(data);
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if(video_output_) video_output_->set_colour_rom(colour_rom_);
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break;
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}
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}
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Cycles Machine::perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
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if(address > ram_top_) {
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if(isReadOperation(operation)) *value = paged_rom_[address - ram_top_ - 1];
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// 024D = 0 => fast; otherwise slow
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// E6C9 = read byte: return byte in A
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if(address == tape_get_byte_address_ && paged_rom_ == rom_ && use_fast_tape_hack_ && operation == CPU::MOS6502::BusOperation::ReadOpcode && via_.tape->has_tape() && !via_.tape->get_tape()->is_at_end()) {
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uint8_t next_byte = via_.tape->get_next_byte(!ram_[tape_speed_address_]);
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set_value_of_register(CPU::MOS6502::A, next_byte);
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set_value_of_register(CPU::MOS6502::Flags, next_byte ? 0 : CPU::MOS6502::Flag::Zero);
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*value = 0x60; // i.e. RTS
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}
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} else {
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if((address & 0xff00) == 0x0300) {
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if(microdisc_is_enabled_ && address >= 0x0310) {
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switch(address) {
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case 0x0310: case 0x0311: case 0x0312: case 0x0313:
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if(isReadOperation(operation)) *value = microdisc_.get_register(address);
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else microdisc_.set_register(address, *value);
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break;
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case 0x314: case 0x315: case 0x316: case 0x317:
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if(isReadOperation(operation)) *value = microdisc_.get_interrupt_request_register();
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else microdisc_.set_control_register(*value);
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break;
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case 0x318: case 0x319: case 0x31a: case 0x31b:
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if(isReadOperation(operation)) *value = microdisc_.get_data_request_register();
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break;
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}
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} else {
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if(isReadOperation(operation)) *value = via_.get_register(address);
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else via_.set_register(address, *value);
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}
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} else {
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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 >= 0x9800 && address <= 0xc000) { update_video(); typer_delay_ = 0; }
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ram_[address] = *value;
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}
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}
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}
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if(typer_ && address == scan_keyboard_address_ && operation == CPU::MOS6502::BusOperation::ReadOpcode) {
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// the Oric 1 misses any key pressed on the very first entry into the read keyboard routine, so don't
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// do anything until at least the second, regardless of machine
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if(!keyboard_read_count_) keyboard_read_count_++;
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else if(!typer_->type_next_character()) {
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clear_all_keys();
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typer_.reset();
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}
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}
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via_.run_for(Cycles(1));
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if(microdisc_is_enabled_) microdisc_.run_for(Cycles(8));
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cycles_since_video_update_++;
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return Cycles(1);
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}
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void Machine::flush() {
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update_video();
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via_.flush();
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}
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void Machine::update_video() {
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video_output_->run_for(cycles_since_video_update_.flush());
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}
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void Machine::setup_output(float aspect_ratio) {
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via_.ay8910.reset(new GI::AY38910());
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via_.ay8910->set_clock_rate(1000000);
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video_output_.reset(new VideoOutput(ram_));
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if(!colour_rom_.empty()) video_output_->set_colour_rom(colour_rom_);
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}
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void Machine::close_output() {
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video_output_.reset();
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via_.ay8910.reset();
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}
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void Machine::mos6522_did_change_interrupt_status(void *mos6522) {
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set_interrupt_line();
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}
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void Machine::set_key_state(uint16_t key, bool isPressed) {
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if(key == KeyNMI) {
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set_nmi_line(isPressed);
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} else {
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if(isPressed)
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keyboard_->rows[key >> 8] |= (key & 0xff);
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else
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keyboard_->rows[key >> 8] &= ~(key & 0xff);
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}
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}
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void Machine::clear_all_keys() {
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memset(keyboard_->rows, 0, sizeof(keyboard_->rows));
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}
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void Machine::set_use_fast_tape_hack(bool activate) {
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use_fast_tape_hack_ = activate;
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}
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void Machine::set_output_device(Outputs::CRT::OutputDevice output_device) {
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video_output_->set_output_device(output_device);
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}
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void Machine::tape_did_change_input(Storage::Tape::BinaryTapePlayer *tape_player) {
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// set CB1
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via_.set_control_line_input(VIA::Port::B, VIA::Line::One, !tape_player->get_input());
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}
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std::shared_ptr<Outputs::CRT::CRT> Machine::get_crt() {
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return video_output_->get_crt();
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}
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std::shared_ptr<Outputs::Speaker> Machine::get_speaker() {
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return via_.ay8910;
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}
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void Machine::run_for(const Cycles &cycles) {
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CPU::MOS6502::Processor<Machine>::run_for(cycles);
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}
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#pragma mark - The 6522
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Machine::VIA::VIA() :
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MOS::MOS6522<Machine::VIA>(),
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tape(new TapePlayer) {}
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void Machine::VIA::set_control_line_output(Port port, Line line, bool value) {
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if(line) {
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if(port) ay_bdir_ = value; else ay_bc1_ = value;
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update_ay();
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}
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}
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void Machine::VIA::set_port_output(Port port, uint8_t value, uint8_t direction_mask) {
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if(port) {
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keyboard->row = value;
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tape->set_motor_control(value & 0x40);
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} else {
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ay8910->set_data_input(value);
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}
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}
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uint8_t Machine::VIA::get_port_input(Port port) {
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if(port) {
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uint8_t column = ay8910->get_port_output(false) ^ 0xff;
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return (keyboard->rows[keyboard->row & 7] & column) ? 0x08 : 0x00;
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} else {
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return ay8910->get_data_output();
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}
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}
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void Machine::VIA::flush() {
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ay8910->run_for(cycles_since_ay_update_.flush());
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ay8910->flush();
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}
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void Machine::VIA::run_for(const Cycles &cycles) {
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cycles_since_ay_update_ += cycles;
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MOS::MOS6522<VIA>::run_for(cycles);
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tape->run_for(cycles);
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}
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void Machine::VIA::update_ay() {
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ay8910->run_for(cycles_since_ay_update_.flush());
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ay8910->set_control_lines( (GI::AY38910::ControlLines)((ay_bdir_ ? GI::AY38910::BCDIR : 0) | (ay_bc1_ ? GI::AY38910::BC1 : 0) | GI::AY38910::BC2));
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}
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#pragma mark - TapePlayer
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Machine::TapePlayer::TapePlayer() :
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Storage::Tape::BinaryTapePlayer(1000000) {}
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uint8_t Machine::TapePlayer::get_next_byte(bool fast) {
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return (uint8_t)parser_.get_next_byte(get_tape(), fast);
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}
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#pragma mark - Microdisc
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void Machine::microdisc_did_change_paging_flags(class Microdisc *microdisc) {
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int flags = microdisc->get_paging_flags();
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if(!(flags&Microdisc::PagingFlags::BASICDisable)) {
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ram_top_ = 0xbfff;
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paged_rom_ = rom_;
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} else {
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if(flags&Microdisc::PagingFlags::MicrodscDisable) {
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ram_top_ = 0xffff;
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} else {
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ram_top_ = 0xdfff;
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paged_rom_ = microdisc_rom_.data();
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}
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}
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}
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void Machine::wd1770_did_change_output(WD::WD1770 *wd1770) {
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set_interrupt_line();
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}
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void Machine::set_interrupt_line() {
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set_irq_line(
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via_.get_interrupt_line() ||
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(microdisc_is_enabled_ && microdisc_.get_interrupt_request_line()));
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}
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