JIFFY-DOS:

  A kernal replacement providing better disk-access by CMD.

  Used Zeropage:

   $26: ALLFLAG/RSIZE
   $27: COMSAV
   $9B: KEYBYT
   $9F: CJLA
   $A3: LDFLG/QFLAG
   $A6: TFLAG
   $B0+$B1: KEYPTR
   $B0: SPRSAV
   $B1: RASSAV
   $B2: REGSAV
   $BE: DRVBYT
   $BF: DEST