TS-Book was a portable computer manufactured by Theorysonic. Although it did not enter production, and only 14 prototypes were built. It strongly influenced the design of EKSoft Vexnix and Commodore SX-64.
This concept was created between 1978 and 1984. When the development of TheoryDesk and TS-UGOS began. TS-Book was scrapped in favour of the development of TheoryBook.