somebody tell me what went wrong.

[Craig Marcho]

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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