Rod., and Paul Davis. Harpo Description and Operating Instructions with additional notes and subroutines., 1979.

Jones, David, Richard Brewster, and Paul Davis. Jones and Brewster Documentation (Frame Buffer and D+7A Input/ Output). Owego, NY: Experimental Television Center, 1979.

Davis, Paul. Subroutine Estats, Compiler Definitions, PLOP Error Codes for CAT-100 (26 pages). Owego, NY: Experimental Television Center, 1979.

Davis, Paul. Experimental Television Center S-100 Bus and Interface. Owego, NY: Experimental Television Center, 1977.