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W a g n e r, Michael JI I: Machine Language 
Disk 1/0 & other Mysteries. David Moore -
Editor. Charles Trapp -Assistant Editor. 
D.J.Smith -Cover Design and Graphics. 
1st ed. 2nd printo 11llustr.1 -Upland: 
1JG 1983.270 S. 4 
(TRS-80 Information Series. 5.)