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OSBYTE &79 (121) - Keyboard Scan

   Y=0 X=internal keynumber EOR&80 for single key check
   On exit X<0 if the key was being pressed
   Y=0 X=lowest internal keynumber to start at (for a range of keys) 
   On exit X=earliest keynumber being pressed or &FF for none

See Also

Jgharston 21:56, 26 May 2009 (UTC)