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 Post subject: Multiple save RAM?
PostPosted: Wed Apr 07, 2010 2:51 pm 
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Joined: Fri Apr 28, 2006 7:07 pm
Posts: 64
Location: MN, USA
I'm working on a development cartridge and want to be able to put multiple saves on the cartridge. It'd be MMC1, and my thought it to use a bigger SRAM than needed and take the leftover more-significant bit lines and tie them to a DIP switch to be able to switch between save data banks.

I'm not the most experienced hardware hacker, but it seems to me this would work OK, so long as you didn't mess with the switches while the NES was powered on.


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 Post subject:
PostPosted: Wed Apr 07, 2010 2:55 pm 
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Joined: Mon Sep 20, 2004 6:04 am
Posts: 3471
Location: Indianapolis
Sure, that would work. If you have any bankswitching outputs left over from the MMC1 you could use those too, but I guess those aren't available?


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PostPosted: Wed Apr 07, 2010 3:02 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
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Location: NE Indiana, USA (NTSC)
Nintendo already done it: SOROM and SXROM.


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PostPosted: Wed Apr 07, 2010 4:14 pm 
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Joined: Fri Apr 28, 2006 7:07 pm
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Location: MN, USA
Thanks. And BTW Tepples, this isn't just for any RAM, but for the battery backup RAM, and I don't intend to modify the original ROM(s) for this purpose. Though that would be kinda cool.


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