I've had to make do with a couple of 2 ch. scopes on occasion. That gives me a 4 ch. 'logic analyzer'. If you're looking for a learning aid and you have access to class labs facilities you might be able to get more channels. I would would write a tight little loop to be able to view the signals in question for at least one complete cycle, i.e. a write or read cycle, bus arbitration, etc. It ain't perfect, but it can work. Jon