RE: [Techtoolslist] FW: Using 8080 pod on Midway 8080 boards (Space Invaders)

The pod has a -1 CPU in it which should be good to 3 mhz the board is a
straight 8080a which should be 2mhz. But I tried it with the CPU from the
board just for completeness. No improvement. And the pod cpu works fine in
game.

I have one board that will at least start up partially with the pod, but two
others that just error on Run UUT.

It is really inconsistent. I think the way the memory system works the fluke
ram test will never work (strange timing and sync to get the game board
rotation stuff to coordinate access to ram).

I have two of these pods, both use the flat ribbon. I tried subbing a
twisted ribbon from an 8085 pod but the pod fails self test (I suspect the
ground lead is mucking with something).

-----Original Message-----
From: techtoolslist-bounces@flippers.com
[mailto:techtoolslist-bounces@flippers.com] On Behalf Of John Robertson
Sent: Sunday, February 17, 2013 7:23 PM
To: techtoolslist@flippers.com
Subject: Re: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080
boards (Space Invaders)

David Shoemaker wrote:
>
> So my mails to tech tools don't appear to be getting through. But this
> is a raster game so I will cross the stream.
>
>
>
> *From:* David Shoemaker [mailto:davids@oz.net]
> *Sent:* Saturday, February 16, 2013 12:20 AM
> *To:* 'Technical Tools Mail List'
> *Subject:* Using 8080 pod on Midway 8080 boards?
>
>
>
> I have a fully working space invaders board which when I hook the pod
> up to and do Run UUT doesn't, it starts up and crashes.
>
>
>
> Pod passes self test.
>
>
>
> Anyone ever done this?
>
>
>
> David
>
Try a faster 8080 CPU in the pod, or try substituting the 8080 from the game
in place of the pod CPU. It is possible the CPU is bad or slower than the
system can handle.

Do you have the flat ribbon cable from the pod to the CPU socket or the
twisted pair cable? The twisted pair cable handles noise better and will
work in situations when the simple flat cable won't, plus it can be longer
as a result.

David, I have no idea why this did not show up in TTL - you are subscribed
under the same email address as you posted here. I haven't seen any bounces
for your email address.

John :-#)#

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Received on Mon Feb 18 00:33:06 2013