Cleaning house part 1

We're cleaning up our classrooms in preparation of a move to a new building with more limited space. I came across these old computer interface circuits we used to employ when I taught electronics back in the 90s.

These first two photos show one of the Apple II interface cards we used. These were made using wire-wrap technology. Each card provided two 8 bit digital i/o ports labelled A and B. We would use a ribbon cable like this:
.... to connect to a hand made experimenter board like this.
Here students could control the LEDs or read the position of DIP switches mounted on the white header.
In part 2 I'll look at the next generation . . . PC interface cards.