|David B. Tuttle, Principal Engineer
|Profile, Products, Projects, Publications|
|Cambridge Telecommunications Inc.
5 Old Concord Road, Burlington MA
purchased October 1979 by GTE Telenet Communications
|Cambridge Telecommunications was a privately-held
contract engineering company founded by Rubin Gruber and Greg Burch, exploiting their experience
with IBM compatible terminal products at Sanders Associates in New Hampshire.
CTX changed focus in 1978 to develop microprocessor-based X.25 interface hardware, the CTX 9101 concentrator and the CTX 9301 management station. The CTX 9101 was a rack-mountable chassis with optional hardware redundancy that provided expandable remote terminal connectivity based on Zilog Z80s. The CTX 9301 used the same chassis built into a desk unit with 4 floppy disk drives (5.25") for local storage, to provide a central management station for the CTX 9101 concentrators. The CTX 9301 ran with MP/M-80, the multiprogramming version of CP/M, on a Zilog Z80A processor.
In October 1979, Cambridge Telecommunications was purchased by Telenet Communications Corp. (TCC) of Tysons Corner, VA a scant few months after Telenet had been acquired by General Telephone & Electronics (GTE) Corp.
Specific projects & activities:
Documents, presentations, papers: