CPT was started in 1971 by Dean Scheff in Minneapolis

Minneapolis, Minnesota

Minneapolis , nicknamed "City of Lakes" and the "Mill City," is the county seat of Hennepin County, the largest city in the U.S. state of Minnesota, and the 48th largest in the United States...

, Minnesota

Minnesota

Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

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CPT started off by offering a cassette memory accessory for the IBM Selectric Typewriter.

Their major competition in the space was Wang

Wang

Wang may refer to:Name:* Wang , one of two surnames with distinct Chinese characters.* Titles in Chinese nobility* A title in Korean nobility* A title in Mongolian nobilityPlaces:* Wang River in Thailand...

 and Xerox

Xerox

Xerox Corporation is an American multinational document management corporation that produced and sells a range of color and black-and-white printers, multifunction systems, photo copiers, digital production printing presses, and related consulting services and supplies...

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Models:

• 4200 Series

Their first dedicated word processor was the CPT 4200 available in 1972 with twin cassette drives. This system retailed for $5000.

• 6000 series
• 8000 series
• 9000 series