mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-06-01 02:48:18 -04:00
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "VrcIrq.h"
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class Unl831128C : public BaseMapper
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{
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private:
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unique_ptr<VrcIrq> _irq;
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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 0x400; }
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virtual uint32_t GetWorkRamSize() override { return 0x8000; }
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virtual uint32_t GetWorkRamPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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_irq.reset(new VrcIrq(_console));
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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RemoveRegisterRange(0x8000, 0x9FFF, MemoryOperation::Write);
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RemoveRegisterRange(0xD000, 0xFFFF, MemoryOperation::Write);
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}
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void ProcessCpuClock() override
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{
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_irq->ProcessCpuClock();
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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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uint8_t gameReg = (addr >> 10) & 0x10;
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uint8_t prgMask = 0x0F | gameReg;
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switch(addr & 0xF) {
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case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
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SelectCHRPage(addr & 0x07, value + (gameReg << 4));
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break;
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case 8:
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if (value == 1) {
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SetCpuMemoryMapping(0x6000, 0x7FFF, 0, PrgMemoryType::WorkRam, MemoryAccessType::ReadWrite);
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} else {
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SetCpuMemoryMapping(0x6000, 0x7FFF, (value & prgMask) + gameReg, PrgMemoryType::PrgRom);
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}
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break;
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case 9: case 0xA:
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SelectPRGPage((addr >> 1) & 0x01, (value & prgMask) + gameReg);
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break;
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case 0xC:
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switch(value & 0x03) {
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case 0: SetMirroringType(MirroringType::Vertical); break;
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case 1: SetMirroringType(MirroringType::Horizontal); break;
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case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
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case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
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}
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break;
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case 0xD:
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_irq->SetControlValue(value);
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break;
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case 0xE:
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_irq->AcknowledgeIrq();
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break;
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case 0xF:
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_irq->SetReloadValue(value);
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break;
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}
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SelectPRGPage(2, (-2 & prgMask) + gameReg);
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SelectPRGPage(3, (-1 & prgMask) + gameReg);
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}
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}; |