The elusive Midway 8080 ram test board

hatrick

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This is the Midway 8080 ram test board for Space Invaders, Gunfight, and Seawolf. It's mentioned in Midway trouble shooting manuals, but this is the first and only one I've actually seen.
Now, does anyone have instructions for this? I know the basics, of how to plug it in, etc, but I don't know what to expect to see in the segmented displays.
 
That's cool. I read about it in the "Standardized" test procedure document, but didn't know wtf they were talking about. Now I know.
 
That's very cool, it's also interesting that they made the board so huge with a tiny layout centered. Do you think it fit in a test fixture or standardized rack of some sort?
 
I haven't tested it, so I don't know if it works. If not, it should be a piece of cake to fix. I'd really like to see some documentation for it.
 
That's very cool, it's also interesting that they made the board so huge with a tiny layout centered. Do you think it fit in a test fixture or standardized rack of some sort?

This attaches to the large main board in place of the smaller board in the "L" shaped Midway 8080 board sets. Then the ribbon cable attaches to the Rom socket in position "H".
 
That's really cool! Thanks for posting this.
If nothing else, you should make a copy of the EPROM, just in case.
I would like to get the schems for that as well.
Jeff
 
Well I have some information from the Kush n' Stuff Manual I have about the 8080 motherboard

The image is going to get compressed posting it here but hopefully you can read it. If you want a better looking image I could probably email it to you.

cool find. I'd love to locate one of those myself
 

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Well I have some information from the Kush n' Stuff Manual I have about the 8080 motherboard

The image is going to get compressed posting it here but hopefully you can read it. If you want a better looking image I could probably email it to you.

cool find. I'd love to locate one of those myself

Awesome! Thanks for posting those. If you don't mind, I'd like a better image. I'll pm you my email address.
Thanks!
 
this looks like just a rom chip, and then uses the I/O to display values on the led displays... was the rom ever dumped?
 
Would make a lot more sense to do a plug-in for the 8080 socket than use the original tester -- that requires a LOT of the board to be working before the tests can run.
 
Mark is correct about this one BUT i have to say if some one was so inclined to repro these i would want one, pretty cool bit of kit in a retro kinda way
from reading the midway repair guides i always wondered what one of them looked like and now i know, for some reason i had imagined something far more complex
 
is there a thread on klov that shows how the midway test boards look like for the
card rack system (gorf/wizard of wor/space zap)? i know they exist like this 8080 pcb
does, but i can never find one for sale nor do i even know what they look like!
 
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