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https://github.com/NovaSquirrel/Mesen-X.git
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52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Caltron41 : public BaseMapper
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{
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private:
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uint8_t _prgBank;
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uint8_t _chrBank;
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x8000; }
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virtual uint16_t GetCHRPageSize() override { return 0x2000; }
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virtual uint16_t RegisterStartAddress() override { return 0x8000; }
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virtual uint16_t RegisterEndAddress() override { return 0xFFFF; }
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void InitMapper() override
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{
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AddRegisterRange(0x6000, 0x67FF, MemoryOperation::Write);
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}
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void Reset(bool softReset) override
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{
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_chrBank = 0;
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_prgBank = 0;
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WriteRegister(0x6000, 0);
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WriteRegister(0x8000, 0);
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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(_prgBank, _chrBank);
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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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if(addr <= 0x67FF) {
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_prgBank = addr & 0x07;
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_chrBank = (_chrBank & 0x03) | ((addr >> 1) & 0x0C);
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SelectPRGPage(0, _prgBank);
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SelectCHRPage(0, _chrBank);
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SetMirroringType(addr & 0x20 ? MirroringType::Horizontal : MirroringType::Vertical);
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} else {
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//"Note that the Inner CHR Bank Select only can be written while the PRG ROM bank is 4, 5, 6, or 7"
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if(_prgBank >= 4) {
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_chrBank = (_chrBank & 0x0C) | (value & 0x03);
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SelectCHRPage(0, _chrBank);
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}
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}
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}
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}; |