[Techtoolslist] RASTER: FW: Using 8080 pod on Midway8080 boards (Space Invaders)

[Andrew Welburn]

I seem to remember that 99% of the time it was fine, but ocassionally i 
would come across a pcb where it might crash or the vectors might get 
messed up in game mode. I seem to remember this one only maybe 1 or 2 
pcbs out of 20?

When i come across pcbs that wont run UUT, i don't panic over them too 
much, because it doesn't affect any other diagnostic function (i use a 
9100A)

The other games that wont run UUT are later multiple-cpu type stuff, but 
i do get it a lot with 68000 games, again, i don't worry about it too 
much, just something to bear in mind.

FWIW - i've never seen a fluke pod with a non-twistedpair cpu cable, and 
i've seen tonnes of the blighters.

Andrew Welburn
http://www.andys-arcade.com

On 20/02/2013 04:14, David Shoemaker wrote:

> Been a while but I am pretty sure I was able to run mine tempest with mine.

>

> -----Original Message-----

> From: techtoolslist-bounces at flippers.com

> [mailto:techtoolslist-bounces at flippers.com] On Behalf Of Clay Cowgill

> Sent: Tuesday, February 19, 2013 7:02 PM

> To: 'Technical Tools Mail List'

> Subject: Re: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway8080 boards

> (Space Invaders)

>

>> We have seen a failure of a

>> 6502 pod such that the address driver line was "weak" and couldn't

>> always drive successfully drive the pin above the TTL threshold.  That

>> same pod would pass its own self test, presumably because the loopback

>> inputs of the pod have higher impedance than the target board address

>> lines.  Perhaps something like that is happening here?

>

> Out of curiosity, has anyone successfully run Tempest from the 6502 pod?  I

> never had any trouble using one to poke around in memory and test stuff (way

> back with the Tempest multigame), but my Tempest machine would never 'run'

> from the 9010.  Tried a couple different CPU's and maybe even a 9005, but I

> only had one 6502 pod...  Never really knew if it was just my machine, the

> pod or both...

>

> -Clay

>

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