You'd think all of this would be ...

Click to expand...

I don't know about that. The pedigree of Apples was basically that everything was backwards compatible. You could always go backwards (i.e. an adapter card was compatible with every machine unless it was built for a specific model... aux slot, mem slot, slot 0, etc.), but if you had an older machine, Steve, Steve and Co. expected you to buy something new to keep up. As we've said, there were complete motherboard "upgrades" that one could perform. But in general, with a few exceptions where ROM swaps were possible, you didn't upgrade from one model of Apple II to the next.