Need microprocessor trainer, oscilloscope advice?

inner workings of vintage computers. I have some basic experience with electronics and >some simple measurement tools (multimeter, logic probe). So far, I've repaired a couple of older machines (Kaypro's, Compaq portables) but this has amounted >to swapping dead hard or floppy drives, replacing dead batteries, etc. So here are my questions: (1) Is there a "trainer" system good for learning about >microcomputer design and operation, and (2) would an oscilloscope be useful for this purpose, and if so, what Mhz rating is needed to work on older machines? >I've noticed the price is directly proportional to this number! Thanks, John R. John, The cheapest solution ( free !! ) I can think of is a Heathkit ET3400 emulator ! If you cannot find one online, contact me direct ( offlist ) and I'll E-mail it to you. It's a pretty decent emulator. The graphics are okay. This is for the 6800 microprocessor. It's a great teaching aid and the price is right... Best regards, Steven Canning