Penfold, R. A. <br/><br/>
An introduction to Z80 machine code /  [Books]. 
by R.A. & J.W. Penfold.  
 - London :   Babani,   1984. 
 - 134p. :   ill. ;   18cm. 
<br/><br/><label>ISBN: </label>0859341275 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machine codes (Electronic computers)<br/>Zilog Z-80 (Microprocessor)--Programming.