In going through 4+ boxes of various documents (data sheets, memos, letters, purchase agreements, etc.), I came across a find related to the printer my wife inherited - an instruction manual for the printer! There is mention anywhere in the manual who the manufacturer is (Alphacom). Interfacing with the following specific computers is included: TRS-80, Apple Card, Pet Interface, Atari 400 and 800, and Mattel Intellivision (keyboard unit).