Calcomp Technology, Inc., usually known as Calcomp, was a company best known for its Calcomp plotters, which it was founded to produce in 1959. It produced a wide range of plotters (both drum and flat-bed), digitizers, and other graphic input/output devices. It also produced IBM plug-compatible (PCM) disk and tape products. The disk products ranged from 2311 (CD-1) through 3350 equivalents. The tape product was a 3420 equivalent.
CalComp (California Computer Products), Anaheim, California was bought by Lockheed in the 1980s.
Calcomp acquired Talos and Summagraphics, which had acquired Houston Instruments.
Calcomp Technology shut down its operations in 1999 and transferred different product lines to various other companies, some of whom continue to use the "Calcomp" or other "Cal-" trademarks:[1]
Houston Instruments was a manufacturer of pen plotters. They used the DMPL plotting control language. They competed with Hewlett Packard plotters such as the HP 7470. They were purchased by Summagraphics.
Drivers for their tablets are located at: http://www.gtcocalcomp.com/supportsummasoftware.htm