1
0
mirror of https://github.com/TomHarte/CLK.git synced 2024-12-11 15:49:38 +00:00
CLK/Machines/Atari2600/Cartridges/Tigervision.hpp

43 lines
1005 B
C++
Raw Normal View History

2017-03-18 22:50:13 +00:00
//
// CartridgeTigervision.h
// Clock Signal
//
// Created by Thomas Harte on 18/03/2017.
// Copyright © 2017 Thomas Harte. All rights reserved.
//
#ifndef Atari2600_CartridgeTigervision_hpp
#define Atari2600_CartridgeTigervision_hpp
#include "Cartridge.hpp"
namespace Atari2600 {
namespace Cartridge {
2017-03-18 22:50:13 +00:00
class Tigervision: public BusExtender {
2017-03-18 22:50:13 +00:00
public:
Tigervision(uint8_t *rom_base, std::size_t rom_size) :
BusExtender(rom_base, rom_size) {
rom_ptr_[0] = rom_base + rom_size - 4096;
2017-03-18 22:50:13 +00:00
rom_ptr_[1] = rom_ptr_[0] + 2048;
}
void perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
2017-03-18 22:50:13 +00:00
if((address&0x1fff) == 0x3f) {
int offset = ((*value) * 2048) & (rom_size_ - 1);
rom_ptr_[0] = rom_base_ + offset;
2017-03-18 22:50:13 +00:00
return;
} else if((address&0x1000) && isReadOperation(operation)) {
*value = rom_ptr_[(address >> 11)&1][address & 2047];
}
}
private:
uint8_t *rom_ptr_[2];
};
}
2017-03-18 22:50:13 +00:00
}
#endif /* Atari2600_CartridgeTigervision_hpp */