Hallgren, Richard C. <br/><br/>
Interface projects for the TRS-80 / 
Richard C. Hallgren. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  c1982. 
 - 152 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0134694376 0134694295 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer interfaces--Amateurs' manuals.<br/>TRS-80 computers.
<br/><br/><label>Dewey Class. No.: </label>621.3819592  / HAI 1982