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