Standalone low-cost interface, controller and emulator for the apple II. - B. T. G. Tan; A. K. Tan (Microprocess. Microsystems, 1984)

Low-cost A/D and D/A interface card for the Apple II microcomputer. - K. H. Oh; A. K. Tan; C. K. Ong (Microprocess. Microsystems, 1987)