A learning module on the applications of microcomputers in instruction, which was developed for preservice and inservice teacher education at Queen's University at Kingston, was implemented within an existing introductory educational media course. An instructional development model (Dick and Carey, 1978) was used to identify instructional goals; analyze learner characteristics and objectives; design parameters; and develop, implement, and evaluate the instructional materials. Designed for use by pairs of students in a 1-hour microcomputer laboratory setting, the resulting module required students to identify and describe the functions of each element in the Apple II Plus microcomputer system and to operate an Apple II using three prepared instructional programs: "Legends" (tutorial); "Lemonade" (simulation); and "Don't Fall" (drill). An optional component introduced BASIC programming and required students to program the computer to generate the square roots of all even integers from 10 to 50. Initial implementation results were positive, although some revisions were recommended. This report includes the three-section module, a six-item quiz, and a course evaluation form. Eight references are listed. (LMM)