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PostPosted: Fri May 19, 2017 10:51 am 
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Joined: Thu May 19, 2005 11:30 am
Posts: 188
This mapper is used by two games:
  • 蝶變 (Diébiàn, in most ROM sets nonsensically rendered in Japanese as "Chou Hen"), the original Joy Van version of Galactic Crusader, overall CRC32 B550B627
  • 未来小子 (Wèilái Xiǎozi), the original Joy Van version of Metal Fighter µ, overall CRC32 CEC28502

The unaltered ROM image of Diébiàn can be found as "Incantation (Dip Bin) (Joy Van)" in GoodNES v3.23b and is incorrectly set to Mapper 146, causing it to reset when pressing Start because of a simple copy protection.

FCEUX and Nestopia use the value written to $4102 plus three as the 8K CHR ROM bank. That is good enough for Wèilái Xiǎozi, but not for Diébiàn. The actual bank seems to be not $4102 plus a fixed "plus three", but "plus number of previous $4100 writes since the last $4101 write", which just happens to be three in the case of Wèilái Xiǎozi. Attached find a Nintendulator Mapper source file which runs both games in their unaltered form.


Attachments:
mapper136.cpp [1.47 KiB]
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PostPosted: Fri May 19, 2017 11:35 am 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 5682
Location: Seattle
... That sounds extremely similar, but not identical, to how I discovered that Mapper 36 actually works.


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PostPosted: Fri May 19, 2017 4:29 pm 
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Joined: Mon Dec 12, 2011 8:15 pm
Posts: 260
viewtopic.php?f=9&t=15302

HI,NewRisingSun , help me,thank you.


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