I'm just tinkering around with some old hardware. I have some old PROM chips from the Commodore 64 (info available here http://symlink.dk/nostalgia/c64/rom/ ). I got the idea that it would be a fun project to try to read them just for the practice and fun of it.
So I'm going to use a couple of shift registers for the address lines, and I will wire up the digital output directly to the avr.
I have a few questions:
1. Does anyone know if I need to worry about voltage on these old chips? I think 5v should be fine but I don't want to fry anything!
2. In terms of sending out the address I want to read, I know that A0-A4 are column and A5-A12 are row, but I'm not sure how to determine what addresses I should send to each. Do I just start at 0x00 and increment?
3. /CS do I hold CS high or low? Or does the chip do that to tell me when to read?