Johnston, Randolph P Microcomputers : concepts and applications / Randolph Johnston. - Software version. - Santa Cruz, California : Mitchell Publishing, c1987. - ill. ; 23 cm. + ISBN: 0394390598 (pbk.) Subjects--Topical Terms: Microcomputers--Programming. LC Class. No.: QA76.6 / .J63 1987 Dewey Class. No.: 005.26