RE: Testing Cinematronics CPU's

You should be able to hardwire a NOP instruction directly to the data pins
and not have to burn a ROM.

-jeff

-----Original Message-----
From: Matt Rossiter - Verio Southern California
[mailto:matt@rossiters.com]
Sent: Wednesday, December 30, 1998 11:30 PM
To: vectorlist@mcfeeley.cc.utexas.edu
Subject: Re: Testing Cinematronics CPU's

I guess I should add one comment. Anyone testing their board would have
to burn their own "test" ROM - which I could make accessible on the
web.

Oh yeah - Happy New Year. :)

Matt

> One idea I have in mind is to create a ROM that has a bunch of "do
> nothing" instructions, or I guess what you would call nops? The last
> instruction on the ROM would be to jump back to its first "do nothing"
> instruction and keep repeating. Put this rom into a working board and
> then document each pin on each chip for reference - which someone could
> use along with a logic probe on a non-working board. - I'd document the
> troubleshooting into separate program functions to make it easier for the
> reader to follow what's going on.
>
> Just some ideas - Anyone have comments on this?
>
> I've got about 5 non-working boards - so I'm sure that by the time I'm
> done fixing all of them I'll have some sort of helpful procedure written
> out.
>
>
> Matt
>
>
> PS. Mark J. - I'm still finishing my G08 contributions. It's hard to get
> anything done over the holidays.
>
>
Received on Thu Dec 31 10:12:55 1998