Nice! I had a Franklin ][e clone at home while I was in high school, and then a real Apple ][e at work (during college). We built control cards that would con

Nice! I had a Franklin ][e clone at home while I was in high school, and then a real Apple ][e at work (during college). We built control cards that would connect to an external box (via opto-couplers!) which could drive stepping motors. Originally these were smaller motors, but eventually the drives included systems that could run milling machines, lathes, etc. One nice thing is that the bus was easy to deal with. Clock speeds were low (all were back then) and the gold-plated edge fingers were (comparatively) big, so you could design a card that just plugged in.