Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!ucsd!ucbvax!hplabs!hpda!hpcupt1!hpsal2!markw From: markw@hpsal2.HP.COM (Mark Williams) Newsgroups: sci.electronics Subject: Re: I Can't copy an EPROM... Help! Message-ID: <4420001@hpsal2.HP.COM> Date: 19 Sep 88 17:05:41 GMT References: <7023@aw.sei.cmu.edu> Organization: HP System Architecture Lab, Cupertino Lines: 6 The part number for the master EPROM (MBM27C512) is a Fujitsu P/N, not Fairchild as the original poster stated. Some Fujitsu EPROM's require a different programming algorithm/voltages than the rest of the industry parts; INTEL used to set a defacto standard, but Fujitsu and others are evolving new cells. Make sure you are using the right part number/algorithm for reading the master EPROM.