53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
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#pragma once
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#include "stdafx.h"
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#include "MMC3_215.h"
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class Unl8237A : public MMC3_215
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{
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void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType) override
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{
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if(_exRegs[0] & 0x40) {
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MMC3::SelectCHRPage(slot, ((_exRegs[1] & 0x0E) << 7) | (page & 0x7F) | ((_exRegs[1] & 0x20) << 2), memoryType);
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} else {
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MMC3::SelectCHRPage(slot, ((_exRegs[1] & 0x0E) << 7) | page, memoryType);
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}
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}
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void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
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{
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uint8_t sbank = 0;
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uint8_t bank = 0;
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uint8_t mask = 0;
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if(_exRegs[0] & 0x40) {
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mask = 0x0F;
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sbank = (_exRegs[1] & 0x10);
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if(_exRegs[0] & 0x80) {
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bank = ((_exRegs[1] & 0x03) << 4) | ((_exRegs[1] & 0x08) << 3) | (_exRegs[0] & 0x07) | (sbank >> 1);
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}
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} else {
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mask = 0x1F;
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if(_exRegs[0] & 0x80) {
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bank = ((_exRegs[1] & 0x03) << 4) | ((_exRegs[1] & 0x08) << 3) | (_exRegs[0] & 0x0F);
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}
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}
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if(_exRegs[0] & 0x80) {
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bank <<= 1;
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if(_exRegs[0] & 0x20) {
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bank &= 0xFC;
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MMC3::SelectPRGPage(0, bank);
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MMC3::SelectPRGPage(1, bank + 1);
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MMC3::SelectPRGPage(2, bank + 2);
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MMC3::SelectPRGPage(3, bank + 3);
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} else {
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MMC3::SelectPRGPage(0, bank);
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MMC3::SelectPRGPage(1, bank + 1);
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MMC3::SelectPRGPage(2, bank);
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MMC3::SelectPRGPage(3, bank + 1);
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}
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} else {
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MMC3::SelectPRGPage(slot, ((_exRegs[1] & 0x03) << 5) | ((_exRegs[1] & 0x08) << 4) | (page & mask) | sbank);
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}
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}
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};
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