I had one of these when they came out. It truly was a marvel at the time. I used it all the time as my side machine. It was great as a spreadsheet machine, it wasn't fast but it could run very decent financial models.
This article is the best I've ever seen about how the 'slate worked. It's super long, but really does a nice job on the technology.
jawon
I've never seen this before. I love the design. It's like a drum machine for spreadsheets. And it's from 1983, the same year the Tandy Model 100 was released. A good year for gadgets.
prox
Another computer from that time with a micro cassette is the P2000 from Philips.
This article is the best I've ever seen about how the 'slate worked. It's super long, but really does a nice job on the technology.