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Re: data bus
Yeah, we played with 8 bit dual port ram. The idea was to have a small amount of parallel transfer buffering between various smart peripherals. Each would own a different address chunk and there would be a different dual port ram associated with each peripheral.
We never got it very reliable due to heavy RC filtering on the pins. I was going to go back and put some schmitt buffers to clean up the signal edges as I thought the slow rise/decay times that might be part of the problem... but never got back to it.
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