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CLK/Machines/Atari/2600/Cartridges/ParkerBros.hpp
2019-11-09 15:31:41 -05:00

49 lines
1.1 KiB
C++

//
// CartridgeParkerBros.h
// Clock Signal
//
// Created by Thomas Harte on 18/03/2017.
// Copyright 2017 Thomas Harte. All rights reserved.
//
#ifndef Atari2600_CartridgeParkerBros_hpp
#define Atari2600_CartridgeParkerBros_hpp
#include "Cartridge.hpp"
namespace Atari2600 {
namespace Cartridge {
class ParkerBros: public BusExtender {
public:
ParkerBros(uint8_t *rom_base, std::size_t rom_size) :
BusExtender(rom_base, rom_size) {
rom_ptr_[0] = rom_base + 4096;
rom_ptr_[1] = rom_ptr_[0] + 1024;
rom_ptr_[2] = rom_ptr_[1] + 1024;
rom_ptr_[3] = rom_ptr_[2] + 1024;
}
void perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
address &= 0x1fff;
if(!(address & 0x1000)) return;
if(address >= 0x1fe0 && address < 0x1ff8) {
int slot = (address >> 3)&3;
rom_ptr_[slot] = rom_base_ + ((address & 7) * 1024);
}
if(isReadOperation(operation)) {
*value = rom_ptr_[(address >> 10)&3][address & 1023];
}
}
private:
uint8_t *rom_ptr_[4];
};
}
}
#endif /* Atari2600_CartridgeParkerBros_hpp */