The Proton PC-1 is a 6502 based computer in a keyboard case. Produced by the Dutch electronics firm Post Electronics, later known for the Ultiboard software.
Targeted at students an hobbyists.

A full size keyboard, a 6502 at 1 MHz, a VIA 6522 and optional cards for extra ROM (with Basic), video display cassette interface.
Standard a 16 character alphanumeric display is built in above the keyboard.
One of my Protons came in a suitcase with the Proton logo.


I know of 3 Proton PC-1 which are slightly different. The first two I owned look alike, the third one (owned by Dirk Prins) shows the PA port of the VIA 6522.

Advert on the backpage of the KIM Kenner Club Magazine 29, 1983:

Proton PC-1 photo by Dirk Prins

Downloads:

	Proton PC-1 User’s Manual (Original from TheByteAttic, converted to black and white and fixed as much as possible by me)
	Proton PC-1 source as typed in from the manual and/or disassembled by Dirk Prins and the ROM dump This is not finished, Dirk Prins is working on completing the source. The source delivers already a binary equal to the ROM dumped by Dirk Prins