Visually presented verbal stimuli by assembly language on the Apple II computer

A method for programming real-time experiments employing visually presented verbal stimuli is described for the Apple II computer. Applesoft BASIC is used to load the stimuli and write the data file, but assembly language controls all aspects of the experimental trials. The method is illustrated for a lexical decision experiment; however, it readily extends to semantic priming, recognition, sentence verification, and single- or multiple-line reading experiments. The method maximizes both precision and stimulus capacity.