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 Post subject: Using DRAM
PostPosted: Mon Dec 11, 2006 12:05 pm 
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Joined: Mon Sep 27, 2004 2:13 pm
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Location: .ma.us
I'm not sure if anyone could use this but here's a basic DRAM circuit for 6502:

Image

It does 1 hidden refresh cycle per read/write, if you use a faster clock you can get in more refresh cycles by altering it to toggle /RAS after /RAS = 1 && /CAS = 0

Adjust the NAND gate for the JKFF's CLK active level


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