A BASIC computer program was written for an experiment that measures the time of a fall of a ball-bearing dropped through a measured distance. However, the timing subroutine was written in machine language. The reason for using machine language, the machine language program, hardware used, and the experiment are discussed. (JN)

The "Measurement Module" is a device which records measurements for microcomputer input. Construction of the device, software, and uses in physics experiments and demonstrations are discussed. (JN)