On: The Texas Instruments TMX 1795: the first, forgott...

[cbd1984]

The Kenbak-1 is the world's first personal computer: https://en.wikipedia.org/wiki/Kenbak-1

[stefantalpalaru → cbd1984]

If you really stretch the definition:

> To use the machine, one had to program it with a series of buttons and switches, using pure machine code. Output consisted of a series of lights.

Also, the Kenbak-1 was made in 1970 and sold in 1971 while the Programma 101 was made in 1964 and sold in 1965.