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CLK/Machines/Atari/2600/Cartridges/CommaVid.hpp

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//
// CartridgeCommaVid.h
// Clock Signal
//
// Created by Thomas Harte on 18/03/2017.
// Copyright 2017 Thomas Harte. All rights reserved.
//
#ifndef Atari2600_CartridgeCommaVid_hpp
#define Atari2600_CartridgeCommaVid_hpp
#include "Cartridge.hpp"
namespace Atari2600 {
namespace Cartridge {
class CommaVid: public BusExtender {
public:
CommaVid(uint8_t *rom_base, std::size_t rom_size) : BusExtender(rom_base, rom_size) {}
void perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
if(!(address & 0x1000)) return;
address &= 0x1fff;
if(address < 0x1400) {
if(isReadOperation(operation)) *value = ram_[address & 1023];
return;
}
if(address < 0x1800) {
ram_[address & 1023] = *value;
return;
}
if(isReadOperation(operation)) *value = rom_base_[address & 2047];
}
private:
uint8_t ram_[1024];
};
}
}
#endif /* Atari2600_CartridgeCommaVid_hpp */