Sharp PC-1211

The Sharp PC-1211 is the first pocket computer ever released, marketed by Sharp Corporation in March 1980. The computer was powered by two 4-bit CPUs laid out in power-saving CMOS circuitry. One acted as the main CPU, the other dealt with the input/output and display interface. Users could write computer programs in BASIC.
A badge-engineered version of the PC-1211, the TRS-80 Pocket Computer, was marketed by Radio Shack in July 1980 as the first iteration of the TRS-80 Pocket Computer with just a marginally different look

Technical specifications

24 digit dot matrix LCD
Full QWERTY-style keyboard
Integrated beeper
Connector for printer and tape drive
Programmable in BASIC
Uses four MR44 Mercury button cells
Battery life in excess of 200 hours
1424 program steps, 26 permanent variable locations and 178 variables shared with program steps
Built out of off-the-shelf CMOS components, including SC43177/SC43178 processors at and three TC5514P RAM modules

Accessories

CE-121 Cassette Interface
CE-122 Printer

TRS-80 Pocket Computer ("PC-1")

A badge-engineered version of the Sharp PC-1211 was introduced in July 1980 and marketed by Radio Shack as the original TRS-80 Pocket Computer. This was later referred to as the "PC-1" to differentiate it from subsequent entries in the TRS-80 Pocket Computer line.