Processor Technology Corporation was a personal computer company founded in April 1975, by Gary Ingram and Bob Marsh in Berkeley, California.

[3] Popular Electronics magazine wanted a feature article on an intelligent computer terminal and Technical Editor Les Solomon asked Marsh and Lee Felsenstein to design one.

[8] 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.