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SEEQ DQ52B33 differences to 28C64

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Seems like there are a few old timers on this message board, which is good. Anyone know why a 28C64 doesn't work (in write mode) when used as a replacement for the SEEQ 52B33?

I can get the host (old computer system) to read the 28C64 (once I program it externally) but it fails to write to it for some reason. Did the SEEQ part have something unusual regarding its write mode??

I've tried a few different brands of 28C64 (Atmel, Microchip) they all seem to fail after writing to the first byte.
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