Atari I, Robot video ram

den56

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I have a I, Robot that has detected a bad video ram at start up. The chip is an AM9128-10 PC that according to spec's is rated at 100ns max access time. I can find the same chip but with either a 150 or 200ns max access time.

Are these other chips fast enough or do I need to stick with faster ones. Also, can the different speeds be mixed?

Thanks
 
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