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267 lines
5.9 KiB
C++
267 lines
5.9 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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_cycles_since_video_update(0),
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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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{
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set_clock_rate(1000000);
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_via.set_interrupt_delegate(this);
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_keyboard.reset(new Keyboard);
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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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{
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if(target.tapes.size())
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{
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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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{
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set_typer_for_string(target.loadingCommand.c_str());
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}
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if(target.oric.use_atmos_rom)
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{
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memcpy(_rom, _basic11.data(), std::min(_basic11.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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}
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else
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{
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memcpy(_rom, _basic10.data(), std::min(_basic10.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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{
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if(rom == BASIC11) _basic11 = std::move(data); else _basic10 = std::move(data);
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}
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unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
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{
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if(address >= 0xc000)
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{
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if(isReadOperation(operation)) *value = _rom[address&16383];
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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 && _use_fast_tape_hack && operation == CPU6502::BusOperation::ReadOpcode && _via.tape->has_tape() && !_via.tape->get_tape()->is_at_end())
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{
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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(CPU6502::A, next_byte);
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set_value_of_register(CPU6502::Flags, next_byte ? 0 : CPU6502::Flag::Zero);
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*value = 0x60; // i.e. RTS
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}
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}
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else
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{
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if((address & 0xff00) == 0x0300)
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{
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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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{
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if(isReadOperation(operation))
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*value = _ram[address];
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else
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{
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if(address >= 0x9800) { 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 == CPU6502::BusOperation::ReadOpcode)
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{
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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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{
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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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_cycles_since_video_update++;
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return 1;
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}
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void Machine::synchronise()
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{
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update_video();
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_via.synchronise();
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}
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void Machine::update_video()
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{
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_videoOutput->run_for_cycles(_cycles_since_video_update);
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_cycles_since_video_update = 0;
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}
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void Machine::setup_output(float aspect_ratio)
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{
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_videoOutput.reset(new VideoOutput(_ram));
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_via.ay8910.reset(new GI::AY38910());
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_via.ay8910->set_clock_rate(1000000);
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}
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void Machine::close_output()
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{
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_videoOutput.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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{
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set_irq_line(_via.get_interrupt_line());
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}
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void Machine::set_key_state(uint16_t key, bool isPressed)
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{
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if(key == KeyNMI)
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{
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set_nmi_line(isPressed);
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}
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else
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{
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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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{
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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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{
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_use_fast_tape_hack = activate;
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}
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void Machine::tape_did_change_input(Storage::Tape::BinaryTapePlayer *tape_player)
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{
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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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{
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return _videoOutput->get_crt();
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}
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std::shared_ptr<Outputs::Speaker> Machine::get_speaker()
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{
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return _via.ay8910;
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}
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void Machine::run_for_cycles(int number_of_cycles)
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{
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CPU6502::Processor<Machine>::run_for_cycles(number_of_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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_cycles_since_ay_update(0),
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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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{
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if(line)
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{
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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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{
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if(port)
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{
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keyboard->row = value;
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tape->set_motor_control(value & 0x40);
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}
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else
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{
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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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{
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if(port)
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{
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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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}
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else
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{
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return ay8910->get_data_output();
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}
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}
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void Machine::VIA::synchronise()
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{
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ay8910->run_for_cycles(_cycles_since_ay_update);
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ay8910->flush();
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_cycles_since_ay_update = 0;
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}
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void Machine::VIA::run_for_cycles(unsigned int number_of_cycles)
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{
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_cycles_since_ay_update += number_of_cycles;
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MOS::MOS6522<VIA>::run_for_cycles(number_of_cycles);
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tape->run_for_cycles((int)number_of_cycles);
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}
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void Machine::VIA::update_ay()
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{
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ay8910->run_for_cycles(_cycles_since_ay_update);
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_cycles_since_ay_update = 0;
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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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{}
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uint8_t Machine::TapePlayer::get_next_byte(bool fast)
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{
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return (uint8_t)_parser.get_next_byte(get_tape(), fast);
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}
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