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65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Ax5705 : public BaseMapper
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{
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private:
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uint8_t _chrReg[8];
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protected:
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uint16_t GetPRGPageSize() override { return 0x2000; }
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uint16_t GetCHRPageSize() override { return 0x400; }
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void InitMapper() override
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{
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memset(_chrReg, 0, sizeof(_chrReg));
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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for(int i = 0; i < 8; i++) {
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SelectCHRPage(i, _chrReg[i]);
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}
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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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ArrayInfo<uint8_t> chrReg{ _chrReg, 8 };
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Stream(chrReg);
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}
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void UpdateChrReg(int index, uint8_t value, bool low)
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{
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if(low) {
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_chrReg[index] = (_chrReg[index] & 0xF0) | (value & 0x0F);
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} else {
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_chrReg[index] = (_chrReg[index] & 0x0F) | ((((value & 0x04) >> 1) | ((value & 0x02) << 1) | (value & 0x09)) << 4);
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}
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SelectCHRPage(index, _chrReg[index]);
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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 >= 0xA008) {
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bool low = (addr & 0x01) == 0x00;
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switch(addr & 0xF00E) {
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case 0xA008: UpdateChrReg(0, value, low); break;
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case 0xA00A: UpdateChrReg(1, value, low); break;
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case 0xC000: UpdateChrReg(2, value, low); break;
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case 0xC002: UpdateChrReg(3, value, low); break;
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case 0xC008: UpdateChrReg(4, value, low); break;
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case 0xC00A: UpdateChrReg(5, value, low); break;
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case 0xE000: UpdateChrReg(6, value, low); break;
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case 0xE002: UpdateChrReg(7, value, low); break;
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}
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} else {
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switch(addr & 0xF00F) {
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case 0x8000: SelectPRGPage(0, ((value & 0x02) << 2) | ((value & 0x08) >> 2) | (value & 0x05)); break; // EPROM dump have mixed PRG and CHR banks, data lines to mapper seems to be mixed
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case 0x8008: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
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case 0xA000: SelectPRGPage(1, ((value & 0x02) << 2) | ((value & 0x08) >> 2) | (value & 0x05)); break;
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}
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}
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}
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}; |