LARGE SCALE INTEGRATION MUSEUM

The TRS-80 Micro Computer System (TRS-80; later known as the Model I to distinguish it from successors) is a desktop microcomputer launched in 1977 and sold by Tandy Corporation through …

In March 1978 Tandy introduced the first version of Level II BASIC for the TRS-80 Model 1.  A Level 1 to Level II upgrade was available from Radio Shack dealers. …

The TRS-80 Model II was a computer system launched by Tandy in October 1979, and targeted at the small-business market.  Despite its name, the Model II was not an upgrade …

In July 1980, Tandy released the TRS-80 Model III. The improvements of the Model III over the Model I included: built-in lowercase, a better keyboard with repeating keys, an enhanced …

The Radio Shack TRS-80 Color Computer (also marketed as the Tandy Color Computer and affectionately nicknamed CoCo) is a line of home computers based on the Motorola 6809 processor.  Despite …

The successor to the Model III was the TRS-80 Model 4. It had faster Z80A 4 MHz CPU, a larger video display 80 columns x 24 rows, bigger keyboard, and …

A “luggable” version known as the Model 4P is a self-contained unit with a case design similar to that of a portable sewing machine. It had all the features of …

The TRS‑80 Model 4D was Radio Shack’s final entry in the line of TRS‑80 computers that began in 1977 with the Model I. Many people consider it to be the …