memory, the VDM-1 provided memory-mapped I/O for high performance, and also included hardware support for scrolling. The VDM-1 Video Board was a great improvement over using a teletype machine or a serial attached terminals, and was popular for owners of other S-100 bus systems such as the IMSAI 8080. Another popular product was the CUTS Tape I/O Interface S-100 board. The CUTS board offered standard interface for saving and reading data from cassette tape, supporting both the Kansas City standard format, as well as their own custom CUTS format. Lee Felsenstein was key participant of the development of Kansas City standard format, the first cross-system data transfer standard for microcomputers. Products Computers Sol-PC — Single circuit board only without case or power supply; available as fully assembled or as kit form Sol-10 Terminal Computer — Stripped-down model without 5 slot S-100 backplane; available as fully assembled or as kit form Sol-20 Terminal Computer — Includes 5-slot S-100 backplane; available as fully assembled or as kit form Sol-20 price 1976 approximately $5000 CND with extra 16K card S-100 bus boards VDM-1 — Video Display Module Board 3P+S — Input/Output Module 3 Parallel plus 1 Serial Board 4KRA — 4K Static Memory Board 8KRA — 8K Static Memory Board 16KRA — 16K DRAM memory board 32KRA-1 — 32K DRAM memory board CUTS — Tape I/O Interface Board, CUTS format and Kansas City standard format 2KRO — EPROM memory board Helios II Disk Memory System GPM — General Purpose Memory, ROM board held CUTER Monitor Program Software SOLOS — Operating System CUTER — Monitor program and cassette tape loader. ASSM — 8080 Assembler BASIC/5 — 5K BASIC programming language Extended Cassette Basic (8K) — BASIC Interpreter FOCAL programming language ALS-8 PTDOS — operating system for use with the Helios II Disk Drive EDIT — 8080 Editor 8080 Chess — Chess Game TREK-80 — Star Trek Themed Game GamePack 1 — Collection of Games - Volume 1 GamePack 2 — Collection of Games - Volume 2 Works cited References External links Archive of Sol-20 information Collection of old analog and digital computers at www.oldcomputermuseum.com the SOL-20 at old-computers.com Processor Technology SOL - PC History by Stan Veit Processor Technology SOL-PC – An early Sol-20 minus the 20 1975 establishments in California 1979 disestablishments in California American companies established in 1975 American companies disestablished in 1979 Computer companies established in 1975 Computer companies disestablished in