16Pin DIP 80ns 262144 x 1bit Static Column RAM from Hitachi
The exact designation I found was "HM51258P-8" now you state "HM51256P-8" is it possible that you mis-read the chip data?
if not then it might not be static column ram, but the above is the best I can find thus-far. if you contact Hitachi and see if they can provide you the data-sheet for the HM51256P-8
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