The TX-O was an experimental computer built at Lincoln Labs at the Massachusetts Institute of Technology (MIT) in 1953.
The TX-O used transistors instead of vacuum tubes. It utilized the Flexowriter printer that was also used with the SAGE computer.
The TX-O was the first in a series of TX computers at Lincoln Labs.
The TX-O was eventually turned over to the MIT Electrical Engineering Department for use by students. A successor computer, the TX-2, was also developed at Lincoln Labs.
On October 26, 1960, a television broadcast was aired on the CBS show "The Thinking Machine" which featured a series of western playlets developed by a program run on the TX-O. The program, called SAGA II, was developed for the TX-O by Douglas Ross and Harrison Morse of MIT's Electronics Systems Laboratory.