Re: somebody tell me what went wrong.

[romans@starstream.net (Romans, Mark)]

I recently built the same thing.  The ribbon cable reversed the pins.  No
run.
I had to rebuild the thing.  I have about 12" ribbon cable.  It was
susceptible to noise.  If I used electrical acc the engine would stutter.  I
wrapped the ribbon in alum foil and grounded it to the ecm case.  I have the
zif socket barely showing out of where the under dash light goes on the pass
side under dash cover and it works great.  No more ecm laying on the floor.
Easy prom changes!
Mark
----- Original Message -----
From: "Craig Marcho" <marcho@flash.net>
To: <gmecm@diy-efi.org>
Sent: Monday, May 01, 2000 10:26 PM
Subject: somebody tell me what went wrong.


> I decided to buy a ZIF socket, and run a ribbon cable to my ECM to make
> swapping eprom's easier. I buy a ZIF socket, board to mount it on, eprom
> socket, dig out a 40-pin IDE hard drive ribbon cable and some 90 degree
and
> straight headers. I use some copper wire to solder the ZIF to a 90 degree
> header, both mounted on the board. I plug in the IDE cable to the header.
On
> the other end of the IDE cable, is a long header. I bend the pins at a 30
> degree angle or so, and solder those to an eprom socket. I use my digital
> multi-meter to check continuity between each pin, and also to verify that
I
> had the number one pin in the correct place from the ZIF to the socket. I
> plug the socket into my ECM, and pop in an eprom on the ZIF. Car won't
> start. (This is on an '85 Corvette with '870 ECM, btw). I come inside and
> plug the socket into my PB-10 and read the eprom into buffer. It doesn't
> match the bin that I programmed into the eprom in the ZIF socket. I notice
> also that everytime I read the device into buffer, the checksum is
different
> each time. I unplug the eprom from my home-made ZIF and plug it into the
> PB-10. Read into buffer, and everything is fine, it matches the bin that I
> loaded into it, and each time I read the device into buffer, the checksum
is
> perfect. So, obviously something isn't right in my home-made ZIF socket
> thing. I have checked with a digital multi-meter every pin from the ZIF to
> the other end of the IDE cable, and they all match up, none of them
touching
> another or anything. Everything seems fine on the thing I made, but it
> doesn't work. What am I missing here?
>
> Craig M.
>
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