Mr. Markham, AN INTERFACE FOR CONTROLLING EXTERNAL DEVICES VIA THE IBM PC XT AT PARALLEL PORT, Behavior research methods, instruments, & computers, 25(4), 1993, pp. 477-478
This article describes the construction and operation of a simple inte
rface to control external devices via the IBM PC/XT/AT's parallel prin
ter port. The interface is relatively inexpensive and easy to build. I
t is potentially useful for controlling behavioral experiments.