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171 lines
5.7 KiB
C++
171 lines
5.7 KiB
C++
//
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// Vic20.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/06/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Vic20_hpp
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#define Vic20_hpp
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#include "../../Processors/6502/CPU6502.hpp"
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#include "../../Storage/Tape/Tape.hpp"
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#include "../../Components/6560/6560.hpp"
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#include "../../Components/6522/6522.hpp"
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#include "../CRTMachine.hpp"
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#include "../Typer.hpp"
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namespace Vic20 {
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enum ROMSlot {
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ROMSlotKernel,
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ROMSlotBASIC,
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ROMSlotCharacters,
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};
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#define key(line, mask) (((mask) << 3) | (line))
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enum Key: uint16_t {
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Key2 = key(7, 0x01), Key4 = key(7, 0x02), Key6 = key(7, 0x04), Key8 = key(7, 0x08),
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Key0 = key(7, 0x10), KeyDash = key(7, 0x20), KeyHome = key(7, 0x40), KeyF7 = key(7, 0x80),
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KeyQ = key(6, 0x01), KeyE = key(6, 0x02), KeyT = key(6, 0x04), KeyU = key(6, 0x08),
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KeyO = key(6, 0x10), KeyAt = key(6, 0x20), KeyUp = key(6, 0x40), KeyF5 = key(6, 0x80),
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KeyCBM = key(5, 0x01), KeyS = key(5, 0x02), KeyF = key(5, 0x04), KeyH = key(5, 0x08),
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KeyK = key(5, 0x10), KeyColon = key(5, 0x20), KeyEquals = key(5, 0x40), KeyF3 = key(5, 0x80),
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KeySpace = key(4, 0x01), KeyZ = key(4, 0x02), KeyC = key(4, 0x04), KeyB = key(4, 0x08),
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KeyM = key(4, 0x10), KeyFullStop = key(4, 0x20), KeyRShift = key(4, 0x40), KeyF1 = key(4, 0x80),
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KeyRunStop = key(3, 0x01), KeyLShift = key(3, 0x02), KeyX = key(3, 0x04), KeyV = key(3, 0x08),
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KeyN = key(3, 0x10), KeyComma = key(3, 0x20), KeySlash = key(3, 0x40), KeyDown = key(3, 0x80),
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KeyControl = key(2, 0x01), KeyA = key(2, 0x02), KeyD = key(2, 0x04), KeyG = key(2, 0x08),
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KeyJ = key(2, 0x10), KeyL = key(2, 0x20), KeySemicolon = key(2, 0x40), KeyRight = key(2, 0x80),
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KeyLeft = key(1, 0x01), KeyW = key(1, 0x02), KeyR = key(1, 0x04), KeyY = key(1, 0x08),
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KeyI = key(1, 0x10), KeyP = key(1, 0x20), KeyAsterisk = key(1, 0x40), KeyReturn = key(1, 0x80),
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Key1 = key(0, 0x01), Key3 = key(0, 0x02), Key5 = key(0, 0x04), Key7 = key(0, 0x08),
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Key9 = key(0, 0x10), KeyPlus = key(0, 0x20), KeyGBP = key(0, 0x40), KeyDelete = key(0, 0x80),
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TerminateSequence = 0, NotMapped = 0xffff
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};
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class UserPortVIA: public MOS::MOS6522<UserPortVIA>, public MOS::MOS6522IRQDelegate {
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};
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class KeyboardVIA: public MOS::MOS6522<KeyboardVIA>, public MOS::MOS6522IRQDelegate {
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public:
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void set_key_state(Key key, bool isPressed) {
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if(isPressed)
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_columns[key & 7] &= ~(key >> 3);
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else
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_columns[key & 7] |= (key >> 3);
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}
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void clear_all_keys() {
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memset(_columns, 0xff, sizeof(_columns));
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}
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// to satisfy MOS::MOS6522
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uint8_t get_port_input(int port) {
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if(!port) {
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uint8_t result = 0xff;
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for(int c = 0; c < 8; c++)
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{
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if(!(_activation_mask&(1 << c)))
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result &= _columns[c];
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}
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return result;
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}
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return 0xff;
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}
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void set_port_output(int port, uint8_t value, uint8_t mask) {
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if(port)
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_activation_mask = (value & mask) | (~mask);
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}
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KeyboardVIA() {
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clear_all_keys();
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}
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private:
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uint8_t _columns[8];
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uint8_t _activation_mask;
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};
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class Machine:
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public CPU6502::Processor<Machine>,
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public CRTMachine::Machine,
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public MOS::MOS6522IRQDelegate::Delegate,
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public Utility::TypeRecipient {
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public:
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Machine();
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~Machine();
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void set_rom(ROMSlot slot, size_t length, const uint8_t *data);
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void add_prg(size_t length, const uint8_t *data);
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void set_tape(std::shared_ptr<Storage::Tape> tape);
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void set_key_state(Key key, bool isPressed) { _keyboardVIA.set_key_state(key, isPressed); }
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void clear_all_keys() { _keyboardVIA.clear_all_keys(); }
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// to satisfy CPU6502::Processor
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unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
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void synchronise() { _mos6560->synchronise(); }
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// to satisfy CRTMachine::Machine
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virtual void setup_output(float aspect_ratio);
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virtual void close_output() {}
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virtual Outputs::CRT::CRT *get_crt() { return _mos6560->get_crt(); }
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virtual Outputs::Speaker *get_speaker() { return _mos6560->get_speaker(); }
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virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }
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virtual double get_clock_rate() { return 1022727; }
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// TODO: or 1108405 for PAL; see http://www.antimon.org/dl/c64/code/stable.txt
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// to satisfy MOS::MOS6522::Delegate
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virtual void mos6522_did_change_interrupt_status(void *mos6522);
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// for Utility::TypeRecipient
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virtual int get_typer_delay();
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virtual int get_typer_frequency();
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virtual bool typer_set_next_character(Utility::Typer *typer, char character, int phase);
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private:
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uint8_t _characterROM[0x1000];
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uint8_t _basicROM[0x2000];
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uint8_t _kernelROM[0x2000];
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uint8_t *_rom;
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uint16_t _rom_address, _rom_length;
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uint8_t _userBASICMemory[0x0400];
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uint8_t _screenMemory[0x1000];
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uint8_t _colorMemory[0x0400];
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inline uint8_t *ram_pointer(uint16_t address) {
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if(address < sizeof(_userBASICMemory)) return &_userBASICMemory[address];
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if(address >= 0x1000 && address < 0x2000) return &_screenMemory[address&0x0fff];
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if(address >= 0x9400 && address < 0x9800) return &_colorMemory[address&0x03ff]; // TODO: make this 4-bit
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return nullptr;
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}
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inline uint8_t read_memory(uint16_t address) {
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uint8_t *ram = ram_pointer(address);
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if(ram) return *ram;
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else if(address >= 0x8000 && address < 0x9000) return _characterROM[address&0x0fff];
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else if(address >= 0xc000 && address < 0xe000) return _basicROM[address&0x1fff];
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else if(address >= 0xe000) return _kernelROM[address&0x1fff];
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else if(address >= _rom_address && address < _rom_address+_rom_length) return _rom[address - _rom_address];
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return 0xff;
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}
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std::unique_ptr<MOS::MOS6560> _mos6560;
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UserPortVIA _userPortVIA;
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KeyboardVIA _keyboardVIA;
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};
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}
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#endif /* Vic20_hpp */
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