i have read traxtons article and an still a little confused abouit this there seem to be many 27c256 chips out there.but how do you know what ones will work or are all 27c256 proms with 28 pins ok? guess now is the time to really ask if anyone knows if the chips i have been given will work--
they are

ISSI9510
is27c256
-90cw
b603782y4
12.5 PGM
this is the info on the chip anyone know if they will work ok?
i have all the chip burning stuff but havent figured out how to get it to work yet to actually try one.
thanks
pete

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As long as they are not "OTCs" One time writes, they are ok. You want ceramic chips with the exposed window to erase the programming.

That chip you gave has a 90ns speed (that's ok). The CW is a heat operating range...not totally up on that, but it looks ok. You can do with a "DC" range.

The 12.5 is voltage, which is what you want.

So plug'er in and try'er out.