The Amstrad Notepad NC100 is an attempt at a tablet computer, before tablet computers existed. Built in 1992, it uses a Zilog 80 CPU at 4MHz, has 64k RAM, 256k ROM and was designed with word processing in mind. The power consumption was minimal, allowing 20 hours use on standard batteries.
I remember when these were being advertised. Someting along the lines of “Learn how to use it in 15 minutes or your money back”. The big downfall was the 80 column by 8 line screen, it simply wasn’t large enough to easily write a full letter. It wasn’t back lit either, making it difficult to see after using it for a while.