any idea what this schematic is?

[Ray Arachelian]

r.stricklin wrote:
> I'm not sure what the mystery is. It fits a Lisa, and was used to
> download software to the early prototypes of the Macintosh.
>
> http://www.digibarn.com/collections/diagrams/early-mac-interfaces/index.html
>
>
> The earliest Lisa prototypes had 50-pin edge connectors for the I/O
> expansion cards. Sometime between 7/81 and 2/82 the Lisa got the
> pinch-fit, 56-pin edge connector for I/O expansion cards that it
> eventually shipped with. The collection of diagrams at DigiBarn (from
> which the flickr image was nicked) shows this evolution pretty clearly.
>
Ah, there we go!  Thanks for that link! :-)