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48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Bmc63 : public BaseMapper
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{
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private:
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bool _openBus;
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x2000; }
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virtual uint16_t GetCHRPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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WriteRegister(0x8000, 0);
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}
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void Reset(bool softReset) override
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{
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_openBus = false;
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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Stream(_openBus);
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if(!saving && _openBus) {
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RemoveCpuMemoryMapping(0x8000, 0xBFFF);
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}
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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_openBus = ((addr & 0x0300) == 0x0300);
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if(_openBus) {
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RemoveCpuMemoryMapping(0x8000, 0xBFFF);
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} else {
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SelectPRGPage(0, (addr >> 1 & 0x1FC) | ((addr & 0x2) ? 0x0 : (addr >> 1 & 0x2) | 0x0));
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SelectPRGPage(1, (addr >> 1 & 0x1FC) | ((addr & 0x2) ? 0x1 : (addr >> 1 & 0x2) | 0x1));
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}
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SelectPRGPage(2, (addr >> 1 & 0x1FC) | ((addr & 0x2) ? 0x2 : (addr >> 1 & 0x2) | 0x0));
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SelectPRGPage(3, (addr & 0x800) ? ((addr & 0x07C) | ((addr & 0x06) ? 0x03 : 0x01)) : ((addr >> 1 & 0x01FC) | ((addr & 0x02) ? 0x03 : ((addr >> 1 & 0x02) | 0x01))));
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SetMirroringType(addr & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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}; |