The Osborne 1, the world's first commercially produced computer designed to be portable, is 30 years old this month.
Adam Osborne, founder of the Osborne Computer Corporation, introduced the 11kg machine in April 1981, though it didn't go into mass production until June 1981.
This brings back sweet memories
I remember converting a sorting routine in assembler, to be called from MS-Basic, on an Osborne 1.
Originally written for the Apple II in 6502 assembler, I rewrote it in Z-80 assembler on the Osborne.