My dad owned a school that taught computer repair. The Rockwell Aim 65 was about 3 years old at the time, and was sold as a kit, so that was what he used to teach basic diagnostics, soldering, etc. We assembled them in our garage, and he'd break them in some way, so the students could fix them. 10 years later I was teaching electronics at the school, which was a good job for right out of college. By then, we weren't using Rockwells, of course, and the diagnostics were different. The students still liked the soldering, though.