My Dad had two Compucolor 8001s when I was a kid. One he used as his work machine, and the other as a "backup" I used. They felt very advanced for the time (early 80s) and I learned BASIC programming on them, drawing colored lines on the screen using the light pen as my first program. All the ports on the back were 25-pin ports and I learned a little bit about electrical interfaces from my Dad when I fried his Compucolor by plugging the floppy drive unit into the keyboard port.