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  The keyboard services are invoked with interrupt 16H (decimal 22). As with
  all other ROM BIOS services, the keyboard services are selected according
  to the value in register AH. Figure 11-1 lists the ROM BIOS keyboard
  services.

  Service                  Description
  --------------------------------------------------------------------------
  00H                      Read Next Keyboard Character.
  01H                      Report Whether Character Ready.
  02H                      Get Shift Status.
  03H                      Set Typematic Rate and Delay.
  05H                      Keyboard Write.
  10H                      Extended Keyboard Read.
  11H                      Get Extended Keystroke Status.
  12H                      Get Extended Shift Status.
  --------------------------------------------------------------------------

  Figure 11-1.  The ROM BIOS keyboard services.