I stumbled across some interesting pictures on Flickr today. It’s Rick Dickinson, who was a designer for Sinclair Research. Here are some sets, including sketch ideas for the ZX81, as well as products which never made it, but were under development at Sinclair.
http://www.flickr.com/photos/9574086@N0 ... 812198325/
For example, how the ZX81 RAM Pack SHOULD have fitted to the machine:
zx81 ram by Rick Dickinson, on Flickr
Or this computer case design which reminds me, and clearly others, of the PS2:
waferStackModel by Rick Dickinson, on Flickr
See if you can find the Apple Puck Mouse look-a-like!
