> > I've been trying to google up an answer, but have had no luck. What is the > difference between a 27256 and a 27C256 EPROM? Can a 27C256 EPROM be > substituted for a 27256? > > Zane > It never fails... 27256 = NMOS 27C256 = CMOS A 27C256 can be substituted for a 27256, but it isn't advisable to go the other way as NMOS uses more power. Zane