64 lines
1.4 KiB
C
64 lines
1.4 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 StudyBox : public BaseMapper
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{
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private:
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uint8_t _prgRamReg;
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protected:
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virtual uint16_t RegisterStartAddress() { return 0x4200; }
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virtual uint16_t RegisterEndAddress() { return 0x43FF; }
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virtual bool AllowRegisterRead() { return true; }
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virtual uint16_t GetPRGPageSize() { return 0x4000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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virtual uint32_t GetSaveRamSize() { return 0xC00; }
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virtual uint32_t GetSaveRamPageSize() { return 0xC00; }
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virtual uint32_t GetWorkRamSize() { return 0x8000; }
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virtual uint32_t GetWorkRamPageSize() { return 0x2000; }
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void InitMapper()
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{
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_prgRamReg = 0;
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SelectPRGPage(1, 0);
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SelectCHRPage(0, 0);
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SetCpuMemoryMapping(0x4400, 0x4FFF, 0, PrgMemoryType::SaveRam);
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UpdateState();
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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(_prgRamReg);
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}
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uint8_t ReadRegister(uint16_t addr)
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{
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switch(addr) {
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case 0x4200: case 0x4201: case 0x4203: return 0x00;
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case 0x4202: return 0x40;
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default: return 0xFF;
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}
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}
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void UpdateState()
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{
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SetCpuMemoryMapping(0x6000, 0x7FFF, _prgRamReg, PrgMemoryType::WorkRam);
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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if(addr & 0x4203) {
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switch(addr & 0x03) {
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case 0: _prgRamReg = value >> 6; UpdateState(); break;
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case 1: SelectPRGPage(0, value); break;
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}
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}
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}
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};
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