Re: HP Logic Comparators

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I have dropped other crystals in to slow boards down, but there are limits
to how slow you can go for CPUs and Dynamic RAM...

Works fine for TTL only boards though.

John :-#)#

At 11:10 AM 28/07/2003 -0700, Paul Swan wrote:

>Hi,
>
>I have bought one of these as well, and it seemed a cool idea but having
>read the manual it has a restricted operating frequency that's below
>video clock in many games.
>
>Has anyone tried using a sig-gen to replace a xtal with a slow clock and
>had better success with comparators as a consequence?
>
>Regards,
>
>Paul.
>
>
> > Chris Toseland wrote:
> >
> > Hi All,
> >
> > This Weekend I've been trying to use my HP Logic Comparator to help
> > fault find some boards and am getting some very hit and miss results.
> >
> > What I'd like to know is are there certain chips that this equipment
> > won't test correctly?
> > I know that if an output is onto a bus it'll read bad but what about
> > simple stuff like 74ls04 it fails that then works fine with a 74ls08.
> > It definately doesn't like 74ls283's.
> > I have tried 3 or 4 different comparison IC's so it's not down to a
> > bad one of them.
> >
> > It even fails chips on known working boards that I'm using for signal
> > comparison with the scope.
> >
> > I'd like to use it so I can some of my backlog out of the way but it
> > seems just to unreliable for serious fault finding.
> >
> > Do I just put it down to tarnished IC legs or something? Any of you
> > have any input?
> >
> > thanks
> >
> > Chris
> >
> > http://www.muppzlab.co.uk

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Received on Tue Jul 29 00:19:17 2003