[Techtoolslist] EPROM Programming Woes...

[Joe Magiera]

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 at 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

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