62 lines
No EOL
1.4 KiB
C++
62 lines
No EOL
1.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "MemoryManager.h"
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#include "TxcChip.h"
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class Txc22000 : public BaseMapper
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{
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private:
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TxcChip _txc = TxcChip(false);
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uint8_t _chrBank;
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x8000; }
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virtual uint16_t GetCHRPageSize() override { return 0x2000; }
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virtual uint16_t RegisterStartAddress() override { return 0x8000; }
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virtual uint16_t RegisterEndAddress() override { return 0xFFFF; }
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virtual bool AllowRegisterRead() override { return true; }
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void InitMapper() override
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{
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AddRegisterRange(0x4100, 0x5FFF, MemoryOperation::Any);
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RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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_chrBank = 0;
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SelectPRGPage(0, 0);
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SelectCHRPage(0, 0);
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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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Stream(&_txc);
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Stream(_chrBank);
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}
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void UpdateState()
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{
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SelectPRGPage(0, _txc.GetOutput() & 0x03);
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SelectCHRPage(0, _chrBank);
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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uint8_t openBus = _console->GetMemoryManager()->GetOpenBus();
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uint8_t value = openBus;
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if((addr & 0x103) == 0x100) {
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value = (openBus & 0xCF) | ((_txc.Read() << 4) & 0x30);
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}
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UpdateState();
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return value;
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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 & 0xF200) == 0x4200) {
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_chrBank = value;
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}
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_txc.Write(addr, (value >> 4) & 0x03);
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UpdateState();
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}
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}; |