IBM 5100 (year 1975)

By Xah Lee. Date: . Last updated: .
IBM 5100 keyboard 14510 s1386x1039
IBM 5100, made in 1975 to 1978. 2272×1704 [[ image source 2018-05-29 ] By Marcin Wichary.]

Note the math symbols on the keys. That's for programing APL language.

[see Create TeX/Math/APL Keyboard Layout]

The IBM 5100 Portable Computer is a portable computer (one of the first) introduced in September 1975, six years before the IBM Personal Computer. It was the evolution of a prototype called the SCAMP (Special Computer APL Machine Portable) that was developed at the IBM Palo Alto Scientific Center in 1973. In January 1978, IBM announced the IBM 5110, its larger cousin, and in February 1980 IBM announced the IBM 5120. The 5100 was withdrawn in March 1982.

When the IBM PC was introduced in 1981, it was originally designated as the IBM 5150, putting it in the "5100" series, though its architecture was not directly descended from the IBM 5100.

[2018-06-08 from Wikipedia IBM 5100]

IBM 5100 First Portable Computer commercial 1977
IBM 5100 computer from 1975.

See also:

APL Keyboards

Hacker Lore Keyboards