Making Standards
Processor Technology also designed several S-100 bus boards. The boards were meant to be compatible with the circuits of Sol-20.
Most notable was the VDM-1. The Video Display Module 1 was the original video display interface for S-100 bus systems. The board generates sixteen 64-character lines of upper and lower case typeface on any standard composite video monitor or a modified TV set. Utilizing a 1,024 byte (1K) segment of system 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.
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