RE: Signature Analysis without a CAT box

From: Chris Starr <cstarr_at_speakeasy.net>
Date: Thu Jul 03 2003 - 07:56:38 EDT

Hi - I have an HP Signature Analyzer 5005B which I am no longer in need
of. If anyone would like it please email me at invaderkewl@yahoo.com

Thanks.

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of John Robertson
Sent: Thursday, July 03, 2003 3:52 AM
To: vectorlist@vectorlist.org; vectorlist@vectorlist.org
Subject: Re: VECTOR: Signature Analysis without a CAT box

That's what I get for not double checking...I had read that somewhere
recently and hadn't gotten around to checking it out. I made up regular
NOPs by hardwiring a number of CPUs into their permanent NOP state (and
a
simple RESET so that was separate from the UUT (Unit Under Test) so the
watchdog could be ignored to some extent. (Best to disable it)

John :-#)#

At 12:28 AM 03/07/2003 -0700, Zonn wrote:

>On Wed, 02 Jul 2003 09:58:12 -0700, John Robertson <jrr@flippers.com>
wrote:
>
> >A NOP is a NOP. Simply hardwire a 24 pin header to the required
> >configuration and install it in the boot ROM socket.
> >
> >It seems for a Z80 that all you have to do is remove the boot ROM and
as
> >long as the DATA lines are all pulled high then it will happily
NOP...
>
>Actually the lines would need to be pulled low. The Z-80 used all 0's
for a
>NOP, which was pretty cool when patching EPROMs, since you could always

>write a
>00 to any location in an EPROM without having to erase it first.
>
>-Zonn
>-----------------------------------------------------------------------

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Received on Thu Jul 3 07:56:43 2003

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