55 lines
1 KiB
C
55 lines
1 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 Racermate : public BaseMapper
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{
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private:
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uint16_t _irqCounter;
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protected:
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virtual uint16_t GetPRGPageSize() { return 0x4000; }
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virtual uint16_t GetCHRPageSize() { return 0x1000; }
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virtual uint32_t GetChrRamSize() { return 0x10000; }
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virtual uint32_t GetSaveRamSize() { return 0; }
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virtual bool ForceChrBattery() { return true; }
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void InitMapper()
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{
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_irqCounter = 0;
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SelectPRGPage(1, -1);
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SelectCHRPage(0, 0);
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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(_irqCounter);
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}
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void ProcessCpuClock()
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{
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_irqCounter--;
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if(_irqCounter == 0) {
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_irqCounter = 1024;
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CPU::SetIRQSource(IRQSource::External);
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}
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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switch(addr & 0xC000) {
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case 0x8000:
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SelectPRGPage(0, (value >> 6) & 0x03);
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SelectCHRPage(1, value & 0x0F);
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break;
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case 0xC000:
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_irqCounter = 1024;
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CPU::ClearIRQSource(IRQSource::External);
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break;
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}
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}
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};
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