Re: somebody tell me what went wrong.

[Ken Kelly <kenkelly@lucent.com>]

Mike, the Ferrite cores are intended to keep rf signals from
passing along the cable. THey may offer a little help, but
since it is induced signal on the ribbon cable that you are
trying to eliminate, I think sheiled ribbon would be more
effective. That way you stop it before it gets into the
ribbon cable.

]		Ken

Mike Frels wrote:
> 
> I found in the Digi-Key catalog something called EMI Suppression Ferrites
> for ribbon cables. Does EMI stand for ElectroMagnetic Interference? If so
> does anyone have any input on whether or not these would help? I remember
> that a type of these things are at both ends of the video cable for my
> monitor. They are obviously some sort of filter.
> 
> Mike
> 
> At 11:15 AM 5/2/00 -0400, you wrote:
> >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?
> 
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