So I also came across this little item and know people would be interested. The PCB has a copyright date of 1977.
So here are some high resolution scans.
FYI: The linked PDF is high resolution and at 1:1 scale and should print out correctly if someone wants to make their own PCB. The original is on that older style PCB material with the water marks that is unobtanium so I'm not worried about someone passing off one of these as original.
Enjoy...
The embedded pics are at 150dpi and I can't guarantee the sizing...
Here is the high resolution scans...
https://www.applefritter.com/files/Apple-1_Expansion.pdf
I thought this was the only time I have seen a vintage Apple-1 expansion card, but then I remembered Joe Torzewski had one on his Apple-1. Took a look at the pictures and it looks like he had this exact one but cut it down to 3 slots to fit in his case.
Now if I can only track down one of those GT-6144 terminal graphics adapters that are mentioned Tom’s “Apple-1 Replica creation- Back to the Garage” book. I’m curious if one of these graphics adapters was ever sold or built.
Also a bunch of people already emailed me to ask, so I’ll post it here so since I wasn’t clear in my original post, this isn’t my Apple-1 expansion adapter it belongs to someone else they just let me take pictures and scans.
Cheers,
Corey
my first thought - good luck to anyone trying to getting that many cards working on the Apple 1 bus without buffering with some active logic like Wendell Sander did with his Apple 1 expansion card.
Mike Willegal
Corey do you mean the GT-6144 itself, or an adapter specific to the Apple 1 that interfaces between them?
I have a GT-6144, so definitely that exists and was sold in some quantity. The adapter for the Apple 1 was, as far as I know, just some wiring you had to do yourself (the 6144 uses some kind of parallel connection). I'm not aware of anyone producing an actual adapter commercially to go between the two.
I figured based on the advertisement they had something specific. I guess not.
Thanks for the information.
Cheers,
Corey