This may give you a lead as to what it is.....
Pace was also co-founder and President of PaceMark Technologies, a firm
that designed and manufactured computer networking hardware and peripherals
for the education marketplace.
Has anyone ever heard of a PaceMark Technologies IIEasy Print card for the
Apple ][? You'd think it was some sort of printer interface with the
name. However, the edge connector simply has power leads, no data or
address. So this card cannot communicate with the Apple ][. I imagine it
must have been a daughterboard for some other card?
It has a copyright date of 1989 silk-screened on the board. It also has a
DB-25 connector tail on the rear.
Any other connectors on the board (possibly a 26 pin header for a
parallel input from another card)? What are the main chips on the board?
My first guesses are that it's either a printer buffer (takes in data
fast from a conventional Apple ][ printer card, sends it to the printer
as and when the latter can accept it) or that it's some kind of data
translater to make a strange printer emulate an Epson or similar.
-tony