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69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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//Most likely incorrect/incomplete, but works (with minor glitches) with the 2 games marked as mapper 198 that I am aware of.
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//Game 1: 吞食天地: 三国外传 (Tūnshí Tiāndì - Sānguó Wàizhuàn) (CHR RAM, but uses chr banking?, has save ram at 6000-7FFF)
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// 吞食天地: 三国外传 (Tūnshí Tiāndì - Sānguó Wàizhuàn) uses ram 5000-7FFF (Add Chinese character process program in 5000-5FFF)
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// Original 1994 Hong Kong release by an unknown publisher, 640 KiB PRG-ROM.
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//Game 2: 成吉思汗 (Chéngjísīhán) (CHR RAM, work ram mirrored from 5000-7FFF?, doesn't use chr banking)
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// 成吉思汗 (Chéngjísīhán) could actually be using MMC3_199 in reality according to the Nesdev wiki.
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//These games may actually use different mappers altogether.
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class MMC3_198 : public MMC3
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{
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private:
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uint8_t _exRegs[4];
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protected:
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uint32_t GetWorkRamSize() override { return 0x1000; }
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uint32_t GetWorkRamPageSize() override { return 0x1000; }
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uint16_t GetChrRamPageSize() override { return 0x400; }
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bool ForceWorkRamSize() override { return true; }
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void InitMapper() override
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{
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_exRegs[0] = 0;
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_exRegs[1] = 1;
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_exRegs[2] = GetPRGPageCount() - 2;
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_exRegs[3] = GetPRGPageCount() - 1;
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//Set 4kb of work ram at $5000, mirrored
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SetCpuMemoryMapping(0x5000, 0x7FFF, 0, PrgMemoryType::WorkRam);
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MMC3::InitMapper();
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if(GetSaveRamSize() == 0) {
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SetCpuMemoryMapping(0x5000, 0x7FFF, 0, PrgMemoryType::WorkRam);
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}
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}
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void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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Stream(_exRegs[0], _exRegs[1], _exRegs[2], _exRegs[3]);
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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 == 0x8001 && (GetState().Reg8000 & 0x07) >= 6) {
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_exRegs[(GetState().Reg8000 & 0x07) - 6] = value & 0x7F;
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}
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MMC3::WriteRegister(addr, value);
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}
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void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType) override
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{
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MMC3::SelectPRGPage(slot, _exRegs[slot], memoryType);
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}
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void UpdateChrMapping() override
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{
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if(_chrRamSize > 0 && _registers[0] == 0 && _registers[1] == 0 && _registers[2] == 0 && _registers[3] == 0 && _registers[4] == 0 && _registers[5] == 0) {
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SelectChrPage8x(0, 0, ChrMemoryType::ChrRam);
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} else {
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MMC3::UpdateChrMapping();
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}
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}
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};
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