Int 15 Fn 4F  C - Keyboard - Keyboard Intercept (at Model 3x9,xt2,xt286,c  [B]

   AH = 4Fh
   AL = hardware scan code (see #0005)
   CF set

Return: CF set to continue processing scan code
      AL = possibly-altered hardware scan code (see #0005)
   CF clear
      scan code should be ignored

Notes: called by INT 09 handler to translate scan codes; the INT 09 code does
     not examine the scan code it reads from the keyboard until after
     this function returns.  This permits software to rearrange the
     keyboard; for example, swapping the CapsLock and Control keys, or
     turning the right Shift key into Enter.
   DOS 6 KEYB.COM will not pass through this function if Ctrl-Alt-Del is
     pressed and a SmartDrive v4-compatible cache is installed which has
     dirty cache buffers; some other disk caches such as HyperDisk
     operate similarly in order to prevent loss of cached data which has
     not yet been written to disk
   IBM classifies this function as required

See Also: INT 09,INT 15/AH=C0h