Re: somebody tell me what went wrong.

[Ken Kelly <kenkelly@lucent.com>]

Craig,
	Keep the cable very short. I would look for shielded Ribbon
cable. Look at the cable on your PB-10. you will note that
they have a few capactors on the board right next to the ZIF
socket. You need to Bypass the input voltages right by the
chip. You need to put these capacitors as close to the chip
as possible.

		Ken

Craig Marcho wrote:
> 
> 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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