First post, by keenerb
I've got a handful of 28C256 chips, and I need a 28C64 for a board.
From looking at the datasheet I see the pinouts are basically the same, except 28C256's A13 and A14 are NC/not connected on the 28C64 part.
I assume that those signals would be used to select addresses > 8kb? Addressing reads to the first 8kb shouldn't use those pins, so the 28c256 part should work well, I'll just be wasting the additional space.
My programmer seems to bear this out; I can read the first 8kb of a 28C256 by specifying 28C64 as the chip type, but I'd like some validation that this will work reliably.