mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 23:52:26 +00:00
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//
|
|
// Vic20.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 04/06/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef Vic20_hpp
|
|
#define Vic20_hpp
|
|
|
|
#include "../../Processors/6502/CPU6502.hpp"
|
|
#include "../../Components/6560/6560.hpp"
|
|
#include "../../Components/6522/6522.hpp"
|
|
#include "../CRTMachine.hpp"
|
|
|
|
namespace Vic20 {
|
|
|
|
enum ROMSlot {
|
|
ROMSlotKernel,
|
|
ROMSlotBASIC,
|
|
ROMSlotCharacters,
|
|
};
|
|
|
|
class UserPortVIA: public MOS::MOS6522<UserPortVIA> {
|
|
};
|
|
|
|
class KeyboardVIA: public MOS::MOS6522<KeyboardVIA> {
|
|
};
|
|
|
|
class Machine: public CPU6502::Processor<Machine>, public CRTMachine::Machine, public MOS::MOS6522Delegate {
|
|
public:
|
|
Machine();
|
|
|
|
void set_rom(ROMSlot slot, size_t length, const uint8_t *data);
|
|
void add_prg(size_t length, const uint8_t *data);
|
|
|
|
// to satisfy CPU6502::Processor
|
|
unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
|
|
void synchronise() {}
|
|
|
|
// to satisfy CRTMachine::Machine
|
|
virtual void setup_output(float aspect_ratio);
|
|
virtual void close_output() {}
|
|
virtual Outputs::CRT::CRT *get_crt() { return _mos6560->get_crt(); }
|
|
virtual Outputs::Speaker *get_speaker() { return nullptr; } // TODO
|
|
virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }
|
|
|
|
// to satisfy MOS::MOS6522::Delegate
|
|
virtual void mos6522_did_change_interrupt_status(void *mos6522);
|
|
|
|
private:
|
|
uint8_t _characterROM[0x1000];
|
|
uint8_t _basicROM[0x2000];
|
|
uint8_t _kernelROM[0x2000];
|
|
|
|
uint8_t _userBASICMemory[0x0400];
|
|
uint8_t _screenMemory[0x1000];
|
|
uint8_t _colorMemory[0x0400];
|
|
|
|
inline uint8_t *ram_pointer(uint16_t address) {
|
|
if(address < sizeof(_userBASICMemory)) return &_userBASICMemory[address];
|
|
if(address >= 0x1000 && address < 0x2000) return &_screenMemory[address&0x0fff];
|
|
if(address >= 0x9400 && address < 0x9800) return &_colorMemory[0x03ff]; // TODO: make this 4-bit
|
|
return nullptr;
|
|
}
|
|
|
|
inline uint8_t read_memory(uint16_t address) {
|
|
uint8_t *ram = ram_pointer(address);
|
|
if(ram) return *ram;
|
|
else if(address >= 0x8000 && address < 0x9000) return _characterROM[address&0x0fff];
|
|
else if(address >= 0xc000 && address < 0xe000) return _basicROM[address&0x1fff];
|
|
else if(address >= 0xe000) return _kernelROM[address&0x1fff];
|
|
return 0xff;
|
|
}
|
|
|
|
std::unique_ptr<MOS::MOS6560> _mos6560;
|
|
std::unique_ptr<UserPortVIA> _userPortVIA;
|
|
std::unique_ptr<KeyboardVIA> _keyboardVIA;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* Vic20_hpp */
|