Jess, I have an EE Tools Top Max and I often have the same problem. What I have noticed (and I could be way wrong here), is I think my cable between my programmer and PC is suspect. It seems like for short/quick things (verify an EPROM is blank, or do a read of an EPROM), it works fine. But for anything longer, something hangs up and the programming effort of that EPROM is screwed up. But then if I have the cable as straight as I can, or just one nice large smooth curve, it will work fine and I can program 20 EPROMs in a row with no problem. But then I bump or move the cable and the programming will abort or hang up. Just sharing my experience. It would seem obvious to me to try a new cable, but as yet, I haven't done that (go figure). Joe -----Original Message----- From: Techtoolslist [mailto:techtoolslist-bounces@flippers.com] On Behalf Of Jess Askey Sent: Wednesday, March 28, 2018 12:01 AM To: Technical Tools Mail List Subject: [Techtoolslist] EPROM Programming Woes... Heya Folks... I have had a need to program a bunch of EPROMs lately (27128 varieties) and Im not sure if there are sunspots or something, but I can't seem to program anything on either my 29B OR my Intronics USB Programmer... I have successfully programmed like 4 EPROMs out of like 40 attempts. My EPROM's are old pulls from either Atari boards or other used ones I have acquired over the years in storage sticks. They are either ST 27128A Fujitsu 27128 SEEQ 27128 TI TMS27C128 Im being fairly careful about the programming voltages and the 29B identifies the IC before programming it. On the 29B I just get an Error #22 Programming Error right away. Sorta the same thing on my Intronics.... Set it up, verify blank, program, error right away. Are these just too old? Anyone have any good tricks? The strange part is that I was having this exact same issue last night, then all of a sudden my 29B programmed 3 in a row just fine... today, nothing. Thanks Jess _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/