"SOL-20", Processor Technology制造, 1976年

The "SOL" was developed by Bob Marsh, Lee Felsenstein and Gordon French. Bob founded his company, Processor Technology, in April 1975 to manufacture 4K RAM memory boards for the "MITS Altair". In June 1975, Bob and Les Solomon (technical editor of "Popular Electronics" magazine) designed the "SOL-20" computer. Bob used sections of walnut, which he had originally planned to use for a digital clock, he used it as the "SOL-20's" side panels. – A major difference between the "SOL-20" and most other computers of this era was its built-in video drive, which allowed it to be attached to a composite monitor for display. – Based on the "Intel 8080" microprocessor, this machine keeps a special place in computer history for technical as well as aesthetic reasons. It is one of the earliest with a keyboard interface, the "SOL-20" was a precursor of modern video output boards, as it was able to display alphanumeric characters on the screen. The idea was later taken up by the "Apple II" and brought to fruition. – The machine offered here is in very good optical condition; it boots up but no further tests were practiced yet.