mirror of
https://github.com/TomHarte/CLK.git
synced 2024-07-16 22:28:57 +00:00
46 lines
946 B
C++
46 lines
946 B
C++
//
|
|
// CartridgeMegaBoy.h
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 18/03/2017.
|
|
// Copyright © 2017 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef Atari2600_CartridgeMegaBoy_hpp
|
|
#define Atari2600_CartridgeMegaBoy_hpp
|
|
|
|
#include "Cartridge.hpp"
|
|
|
|
namespace Atari2600 {
|
|
|
|
class CartridgeMegaBoy: public Cartridge<CartridgeMegaBoy> {
|
|
public:
|
|
CartridgeMegaBoy(const std::vector<uint8_t> &rom) :
|
|
Cartridge(rom),
|
|
current_page_(0) {
|
|
rom_ptr_ = rom_.data();
|
|
}
|
|
|
|
void perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
|
|
address &= 0x1fff;
|
|
if(!(address & 0x1000)) return;
|
|
|
|
if(address == 0x1ff0) {
|
|
current_page_ = (current_page_ + 1) & 15;
|
|
rom_ptr_ = rom_.data() + current_page_ * 4096;
|
|
}
|
|
|
|
if(isReadOperation(operation)) {
|
|
*value = rom_ptr_[address & 4095];
|
|
}
|
|
}
|
|
|
|
private:
|
|
uint8_t *rom_ptr_;
|
|
uint8_t current_page_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* CartridgeMegaBoy_h */
|