nesdev.com
http://forums.nesdev.com/

Sachen TCU-02 (Mapper 136)
http://forums.nesdev.com/viewtopic.php?f=3&t=15961
Page 1 of 1

Author:  NewRisingSun [ Fri May 19, 2017 10:51 am ]
Post subject:  Sachen TCU-02 (Mapper 136)

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]
Downloaded 11 times

Author:  lidnariq [ Fri May 19, 2017 11:35 am ]
Post subject:  Re: Sachen TCU-02 (Mapper 136)

... That sounds extremely similar, but not identical, to how I discovered that Mapper 36 actually works.

Author:  zxbdragon [ Fri May 19, 2017 4:29 pm ]
Post subject:  Re: Sachen TCU-02 (Mapper 136)

viewtopic.php?f=9&t=15302

HI,NewRisingSun , help me,thank you.

Page 1 of 1 All times are UTC - 7 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/