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75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class IremG101 : public BaseMapper
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{
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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 0x0400; }
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uint8_t _prgRegs[2];
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uint8_t _prgMode;
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void InitMapper() override
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{
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_prgRegs[0] = _prgRegs[1] = 0;
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_prgMode = 0;
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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if(_subMapperID == 1) {
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//032: 1 Major League
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//CIRAM A10 is tied high (fixed one-screen mirroring) and PRG banking style is fixed as 8+8+16F
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SetMirroringType(MirroringType::ScreenAOnly);
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}
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}
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virtual void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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Stream(_prgMode, _prgRegs[0], _prgRegs[1]);
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}
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void UpdatePrgMode()
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{
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if(_prgMode == 0) {
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SelectPRGPage(0, _prgRegs[0]);
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SelectPRGPage(1, _prgRegs[1]);
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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} else {
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SelectPRGPage(0, -2);
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SelectPRGPage(1, _prgRegs[1]);
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SelectPRGPage(2, _prgRegs[0]);
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SelectPRGPage(3, -1);
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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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switch(addr & 0xF000) {
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case 0x8000:
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_prgRegs[0] = value & 0x1F;
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SelectPRGPage(_prgMode == 0 ? 0 : 2, _prgRegs[0]);
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break;
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case 0x9000:
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_prgMode = (value & 0x02) >> 1;
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if(_subMapperID == 1) {
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_prgMode = 0;
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}
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UpdatePrgMode();
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SetMirroringType((value & 0x01) == 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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break;
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case 0xA000:
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_prgRegs[1] = value & 0x1F;
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SelectPRGPage(1, _prgRegs[1]);
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break;
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case 0xB000:
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SelectCHRPage(addr & 0x07, value);
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break;
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}
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}
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}; |