need help for rewire CHR-RAM mapper159

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Easy
Posts: 31
Joined: Tue Oct 20, 2009 3:29 am

need help for rewire CHR-RAM mapper159

Post by Easy »

I've try to repro datach game and put on BANDAI-LZ93D50 Board but all datach game use CHR-RAM. Game work find but graphic error. I don't know how to rewire 8k CHR RAM 28pin put on to 32pin BANDAI-LZ93D50 board.

Does anyone can help this?

Thank you.
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: need help for rewire CHR-RAM mapper159

Post by lidnariq »

The Datach uses a different package for its LZ93D50 than the other parts. As far as we know, the IC itself is compatible, but it's hooked up differently and you'll have to rewire quite a lot.

Naruko has notes in Japanese: http://seesaawiki.jp/famicomcartridge/d/Bandai%20Datach ; http://seesaawiki.jp/famicomcartridge/d ... 20standard

Most pertinently, the Datach games do not support CHR RAM banking at all, and instead just support a flat 8 KiB chunk; additionally, if you want to support the external EEPROM, you'll have to disconnect PPU A12 from the IC and tie that input low.
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