Expansion Cards

https://www.yergens.net/blog1/att-unix-pc-expansion-cards

AND
https://web.archive.org/web/20180115043849/https://enacademic.com/dic.nsf/enwiki/2551597#Expansion_Cards
formerly: http://enacademic.com/dic.nsf/enwiki/2551597#Expansion_Cards
(But they show no pictures...)

My video:

And this STARLAN card

from this auction:

See more on Flickr from @smj