56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Supervision : public BaseMapper
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{
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private:
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const uint32_t EPROM_CRC = 0x63794E25;
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uint8_t _regs[2];
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bool _epromFirst;
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protected:
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virtual uint16_t RegisterStartAddress() { return 0x6000; }
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virtual uint16_t RegisterEndAddress() { return 0xFFFF; }
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virtual uint16_t GetPRGPageSize() { return 0x2000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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_epromFirst = _prgSize >= 0x8000 && CRC32::GetCRC(_prgRom, 0x8000) == EPROM_CRC;
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_regs[0] = _regs[1] = 0;
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UpdateState();
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}
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void StreamState(bool saving)
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{
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BaseMapper::StreamState(saving);
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Stream(_regs[0], _regs[1]);
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}
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void UpdateState()
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{
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uint16_t r = _regs[0] << 3 & 0x78;
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SetCpuMemoryMapping(0x6000, 0x7FFF, (r << 1 | 0x0F) + (_epromFirst ? 0x04 : 0x00), PrgMemoryType::PrgRom);
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SelectPrgPage2x(0, ((_regs[0] & 0x10) ? (r | (_regs[1] & 0x07)) + (_epromFirst ? 0x02 : 0x00) : _epromFirst ? 0x00 : 0x80) << 1);
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SelectPrgPage2x(1, ((_regs[0] & 0x10) ? (r | (0xFF & 0x07)) + (_epromFirst ? 0x02 : 0x00) : _epromFirst ? 0x01 : 0x81) << 1);
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SetMirroringType(_regs[0] & 0x20 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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if(addr < 0x8000) {
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_regs[0] = value;
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} else {
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_regs[1] = value;
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}
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UpdateState();
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}
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};
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