Posts tagged with “Logical Systems”

The TRS‑80 Model 4

The TRS‑80 Model 4, introduced on April 26, 1983, was the continuation of the TRS‑80 computer line that had begun with the Model I in 1977. The Model 4 was officially launched for the press on April 27 at an event sponsored by the Boston Computer Society.

The Model 4 was 100% compatible with the Model III and was able to run all Model III operating systems and applications.

The Source

The Source was a three volume set containing the complete source code of TRSDOS 6.2 (which was the same as LS‑DOS 6.2). Each individual book cost $99, so total cost for a complete set was $297. Later on, these prices were heavily discounted.