mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-30 04:50:08 +00:00
43 lines
1002 B
C++
43 lines
1002 B
C++
//
|
|
// 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 {
|
|
|
|
class Tigervision: public BusExtender {
|
|
public:
|
|
Tigervision(uint8_t *rom_base, std::size_t rom_size) :
|
|
BusExtender(rom_base, rom_size) {
|
|
rom_ptr_[0] = rom_base + rom_size - 4096;
|
|
rom_ptr_[1] = rom_ptr_[0] + 2048;
|
|
}
|
|
|
|
void perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
|
|
if((address&0x1fff) == 0x3f) {
|
|
int offset = ((*value) * 2048) & (rom_size_ - 1);
|
|
rom_ptr_[0] = rom_base_ + offset;
|
|
return;
|
|
} else if((address&0x1000) && isReadOperation(operation)) {
|
|
*value = rom_ptr_[(address >> 11)&1][address & 2047];
|
|
}
|
|
}
|
|
|
|
private:
|
|
uint8_t *rom_ptr_[2];
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* Atari2600_CartridgeTigervision_hpp */
|