HP ET8855 - Logic Analyzer Demonstration System

From: Tony Eros <tony.eros_at_machm.org>
Date: Sun Sep 8 19:37:01 2002

Joe -

Ahh, that makes sense -- thanks for the info. It sounds kind of cool, but
I don't think I'll have much use for it so it's yours for the cost of
shipping if you'd like.

I'll box it up and drop you a note with the total.

-- Tony

At 05:49 PM 9/8/2002 +0000, you wrote:
>Tony,
>
> I've seen stuff like that for logic analyzers. They're just small
> scale computers and are used to teach/demonstrate how to use a logic
> analyzer. I have instructions for one here somewhere (from Gould I
> think). I don't have the device but the docs show the schematic and
> contain the listing of the EPROM on it and it's VERY simple. You can
> make it "run" a short program that's in EPROM and you use that to
> demonstrate how to setup the LA to trigger when certain data appears and
> also set to trigger on the Nth appearance of certain data. The EPROM also
> has some sections with all 0s and alternating 1s and 0s and that's used
> for some other demo but I don't recall exactly what they were for.
>
> The BNC connector on your's is almost certainly to supply 5 VDC for a
> HP logic probe. HP built all (or some) of their probes to get power from
> a BNC connector and included the BNC power point on many of their instruments.
>
> >"reset", "cnt up", "cnt dn", "clear" and "stop".
>
> Sounds like the SW on the board just has a simple counter
> program. Reset the CPU so that it restarts at address 0. Make it count
> up or down, clear the counter without resetting and stop the counter.
>
> If you don't need it. I'd like to play with it.
>
>
> Joe
>
>
>At 01:27 PM 9/8/02 -0400, you wrote:
> >I recently picked one of these up. It's a flat panel with a pair of
> >boards, one marked 8080 and the other marked 6800. Both boards have ZIF
> >processor sockets (the one on the 8080 board is empty). There's a set of
> >four seven-segment LEDs on the 6800 board. The panel includes a pair of
> >toggle switches (run/hold below the 8080 board, run/reset below the
> >6800) There's a bnc plug marked 'logic probe' and a set of switches marked
>
>
> >"reset", "cnt up", "cnt dn", "clear" and "stop".
> >
> >Does anyone have any idea what it's for?
> >
> >-- Tony
> >
> >
Received on Sun Sep 08 2002 - 19:37:01 BST