Michael writes –
At the outset, when designing NadaNet, I envisioned that it could be used to support parallel computing on Apple II machines. To add more processors and save space, I decided that I would package several Apple //e main boards together, without keyboards or peripheral slot cards. (I didn’t disassemble the Apples myself, but found a box of Apple //e main boards being sold as an auction lot for about a dollar each!) I settled on a wooden cube about one foot on a side which I slotted to hold up to 8 main boards. For whimsical reasons, I called it an “AppleCrate”.
AppleCrate: An Apple II-based parallel computer – Link.