Radio Shack TRS-80 Model I

The TRS-80 Model II microcomputer system, designed and manufactured by Radio Shack in Fort Worth, TX, was not intended to replace or obsolete the Model I, it was designed to take up where the Model I left off - a machine with increased capacity and speed in every respect, targeted directly at the small-business application market.
Let's go back to the history:

Catalog: 26-1001
Released: August 1977
Price: US $599.95 (with monitor)
How Many: 200,000 (1977-1981)
CPU: Zilog Z-80A, 1.77 MHz
RAM: 4K, 16K max*
Ports: Cassette I/O, video, Expansion connector*
Display: 12-inch monochrome monitor 64 X 16 text
Expansion: External Expansion Interface*
Storage: Cassette storage*
OS: BASIC in ROM*
* Additional capabilties with Expansion Interface

So expensive huh...?