http://i243.photobucket.com/albums/ff60 ... romram.jpg
P.S. what Ram chip did you want to use ? could be done differently for different ram chips.
I was thinking on my cycle ride home (in the rain) about a 'zeddie simulator'.
This week I've been trying to program some eeproms that I've pulled from some old PC motherboards - 29ee010/020 units. I've hooked them up to an arduino and an i2c I/O expander and tried to read from them. I'm getting really funky results and I want now just to hook it up to a 'proper' address/data bus and see if it works any better. Now then i thought - I'll put it on a zeddie! Hmm - but I need decode logic - and - well, that's just a _tiny_ bit beyond me. But what if I had a way of simulating it?
Well that got me to thinking - Arduino driving a pair of Max6965 i2c IO expanders into an edge connector. A zeddie simulator. You could effectively 'script' the changes in the signal lines and watch the results on the prototype logic you've dangled off it. Are you with me so far?
Arduino (or similar) -> IO expanders -> Edge connector -> ... >--Prototype board.
The thing about this is that you don't need a big fat wide logic analyzer or oscilloscope. You could clock the 'fake zeddy' real slow and probe the prototype logic at your leisure
Is that a good idea or is it the merlot talkin'?!
I thought about writing this in software. That's a bigger picture though.