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 Post subject: Re: VRC IV pinout
PostPosted: Mon Jul 23, 2018 1:13 pm 
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Joined: Sun Jan 22, 2012 12:03 pm
Posts: 7204
Location: Canada
getafixx wrote:
Was there any test roms for use with any of the VRC mappers?

Yes there's this one:
viewtopic.php?p=203716#p203716


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 Post subject: Re: VRC IV pinout
PostPosted: Mon Jul 23, 2018 2:49 pm 
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Location: Canada
Thanks! I'll give these a go.


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 Post subject: Re: VRC IV pinout
PostPosted: Mon Feb 04, 2019 5:34 pm 
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Posts: 468
Location: Poland
Accidentally, during fixing broken Gimmick VRC4 hack, named Suikan Pipe I did some testing to the AX5208C chip, which is pirate VRC4 with 1-1 pinout.

Image

What i've found out is that:
* pin 16, which was meant to be CHR_A18 in original VRC4 is also present in this chip,
* pin 18, which was unknown, is some kind of output. For each of those different addresses, that VRC4 can recognize: $X00Y, where X={0, ..., $f}, Y={0, 1, 2, 3}
this pin is driven low only during write cycle to $9003
* PRG swap is only present at $9002, not also at $9003


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 Post subject: Re: VRC IV pinout
PostPosted: Mon Feb 04, 2019 6:16 pm 
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Location: Seattle
Do we know whether those behaviors just happen to be present in the original VRC4 also?


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