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  Description:  Set Repeat Rate      [PC] [AT] [PS/2]
 
  Sets the ROM BIOS key repeat ("typematic") rate and delay.
 
  Input                                                 Output
  ══════════════════════════════════════════            ═══════
  On the PC/AT and PS/2                                 Nothing
  AH=03H
  AL=05H
  BH=repeat delay (see Notes)
  BL=repeat rate (see Notes)
  On the PCjr
  AH=03H
  AL=subfunction
     00H to restore default rate and delay
     01H to increase initial delay
     02H to decrease repeat rate by one-half
     03H to increase delay and decrease
         repeat rate by one-half
     04H to turn off keyboard repeat
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