The Primo computer series was manufactured by Microkey Kftt. (Kutatási Fejlesztési Termelési Társulás), and was originaly developed to be a school computer in Hungary.
The system was sold in various memory configurations: A-32: 16K ROM 16K RAM A-48: 16K ROM 32K RAM A-64: 16K ROM 48K RAM B-64: 16K ROM 48K RAM
Other differences were:
A type did not have built-in joystick and serial ports.
B type could works togewther with the Commodore VC1541
floppy drive unit (external software had to be load for this from tape).
B type also featured a full stroke keyboard (capacitive was not a
perfect way for quick typing).
There was a colour prototype as well, called pro PRIMO.
Thanks to Viktor Varga for information and pictures.