Lawrence, O. R. <br/><br/>
Computer technology / 
O.R. Lawrence. 
 - Toronto :  McGraw-Hill Ryerson,  c1984. 
 - xii, 242 p. :  ill. ;  25 cm. 
<br/><br/> Includes index.  For use in schools. 
<br/><br/><label>ISBN: </label>007548711X (cased) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers--Circuits.<br/>Logic circuits.