Digital electronics explained I [video cassette]. 

 - England  Audio Visual Source  19--. 
 - 7 video cassette  sd., col.  1/2 in. 
<br/><br/> Colour recording systems: VHS/NTSC 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital electronics
<br/><br/><label>Dewey Class. No.: </label>621.3815 DIG19--