TheoryBook Compact (formerly called TheoryBook Mini) is a line of TSUG sub-notebook computers manufactured by Theorysonic. It's an mid-range Theorysonic laptop computer compared to entry-level TheoryBook Go and high-end TheoryBook.
TheoryBook Compact was first released in March 1995 as TheoryBook Mini. It was a commercial success because they're cheaper than the TheoryBook.
The first TheoryBook Mini came with TS-UGOS for TheoryPDA and the first TheoryBook Compact that came with TS-UGOS was released on 2001.