Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!uw-june!uw-entropy!dataio!pilchuck!ssc!markz
From: markz@ssc.UUCP (Markz Zenier)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Prom burners ???
Message-ID: <1071@ssc.UUCP>
Date: 9 Mar 88 19:59:10 GMT
References: <523@wa3wbu.UUCP>
Organization: SSC, Inc., Seattle, WA
Lines: 15
Summary: Stuck address line

In article <523@wa3wbu.UUCP>, john@wa3wbu.UUCP (John Gayman) writes:
> 
>     I'm having a slight problem with a Prom burner that maybe one of you
> has already run across. The problem seems to be a failure when writing
> to the Prom. I work almost exclusively with 256K Prom's. What happens is
> I can read a Prom but then when I go to write that information onto
> a new Prom, it bombs out at address 4000. It always stops at 4000!  I've
> ...

Try putting a 'scope on the address pins of the prom, you may have a fried
pin driver which is aliasing the addresses.  Also the socket may be open,
If the programmer has had a lot of use, and is a cheap one with 3M/Textool
sockets (the blue green ones) soldered directly to the board.  The AMP sales 
rep (a competitor) said that the pins on the bottom of a Textool socket flex 
a little when the zif lever is worked, causing metal fatigue in the solder.