Godot: A real-time data acquisition and control program for the PET microcomputer

This article discusses a program for the PET microcomputer that is used to record the amount of time a human infant spends attending to one of two stimuli presented via 35-mm slides and a slide projector. The program records the number of attention episodes for either stimulus, the duration of slide presentation, and the number of slides presented. Also controlled are the transfer of data onto cassette tape at the end of the session, the detection of buttonpresses from an external keyboard, and the changing of stimuli. The interfacing used in the system and specialized subroutines are also described.