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Better support for MMC3_198 #33

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Jun 22, 2021
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Better support for MMC3_198 #33

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13 changes: 8 additions & 5 deletions Core/MMC3_198.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,12 @@
#include "MMC3.h"

//Most likely incorrect/incomplete, but works (with minor glitches) with the 2 games marked as mapper 198 that I am aware of.
//Game 1: 吞食天地2 (CHR RAM, but uses chr banking?, has save ram at 6000-7FFF?)
//Game 2: Cheng Ji Si Han (ES-1110) (Ch) (CHR RAM, work ram mirrored from 5000-7FFF?, doesn't use chr banking)
//These games may actually use different mappers.
//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)
// 吞食天地: 三国外传 (Tūnshí Tiāndì - Sānguó Wàizhuàn) uses ram 5000-7FFF (Add Chinese character process program in 5000-5FFF)
// Original 1994 Hong Kong release by an unknown publisher, 640 KiB PRG-ROM.
//Game 2: 成吉思汗 (Chéngjísīhán) (CHR RAM, work ram mirrored from 5000-7FFF?, doesn't use chr banking)
// 成吉思汗 (Chéngjísīhán) could actually be using MMC3_199 in reality according to the Nesdev wiki.
//These games may actually use different mappers altogether.
class MMC3_198 : public MMC3
{
private:
Expand Down Expand Up @@ -44,7 +47,7 @@ class MMC3_198 : public MMC3
void WriteRegister(uint16_t addr, uint8_t value) override
{
if(addr == 0x8001 && (GetState().Reg8000 & 0x07) >= 6) {
_exRegs[(GetState().Reg8000 & 0x07) - 6] = value & (value >= 0x40 ? 0x4F : 0x3F);
_exRegs[(GetState().Reg8000 & 0x07) - 6] = value & 0x7F;
}
MMC3::WriteRegister(addr, value);
}
Expand All @@ -62,4 +65,4 @@ class MMC3_198 : public MMC3
MMC3::UpdateChrMapping();
}
}
};
};