EPROM won't program correctly

[Jeff Flanary]

Why don't you try fileprom.exe instead of eprom.exe.  It saves the EPROM
info to disk and programs from disk instead of memory.  It is newer, at
least the version i've got is, than eprom.  It may be something weird in the
memory or memory setup on your computer that only affects the eprom
program???????  I use fileprom.exe and have never had any problems with
mine.  Hope this helps.  Jeff

----- Original Message -----
From: "trax" <trax at frederickmd.com>
To: <gmecm at diy-efi.org>; <diy-efi at diy-efi.org>; "Kevin Crain"
<kevin at warpten.com>
Sent: Thursday, May 11, 2000 9:21 AM
Subject: EPROM won't program correctly


> Everytime I program an EPROM it will not verify to the buffer.
>
> Equipment:
> Pocket Programmer
> Datarase II
> IBM Thinkpad P133 w/ 40Meg RAM (Windows98 with optional DOS boot)
> 27C256 EPROM from 1990 5.7 IROC desoldered from the carrier
> .BIN file from same chip (obtained successfully by reading EPROM using
above
> equipment and verified in TunerCat against another '90 f-body 350ci
image).
>
> Here are the steps that I performed:
> Erased EPROM in Datarase II
> Booted laptop to DOS (no events in autoexec; config.sys has...
> - DEVICEHIGH=c:\WINDOWS\HIMEM.SYS
> - DOS=HIGH,UMB
> Ran the program called eprom.exe
> Choose 27C256 EPROM
> Put EPROM in ZIF (nice tight fit)
> Blank EPROM check succeeds consistently
> Load buffer with FFs and verify EPROM to buffer (successfull)
> Load stock .BIN for '90 5.7 from hard disk (same image I took from the
chip)
> Program EPROM
> Verify EPROM to buffer
>
> The verify EPROM to buffer always fails.  There are so many addresses that
> are different that the screen just scrolls and scrolls with the errors.  I
> tried this method many times (erase, program ... erase, program ... etc).
> Blank check always succeeds and the verify always fails.  Furthermore, the
> programming seems to always stop on its own before it reaches the 7FFF
> address.  Am I doing something wrong?  Any ideas?  Tonight I am going to
try
> a different laptop (486/50MHz).  I will eventually try a different EPROM
> (should have fresh EPROMs on Monday).  But, I find it hard to believe that
> it would be the EPROM since this is the first time that it has ever been
> erased and it has always worked successfully in the car.  All the legs on
> the EPROM are perfect.  It seems to fit nice and tight into the Pocket
> Programmer's ZIF.
>
> Extra Info:
> Using the concealed option 88 reveals...
> Vpp=12.5 Port Address=0378  Pass=1  Pulse=82  Port Delay=5  Add Strobe=On
>
> Any help you can give is very much appreciated.
>
> Tim Siford
>
>
>
>
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