INT 62 u - FGDRIVER v3.03 - "FG_KBINIT" - ENABLE/DISABLE LOW-LEVEL KBD HANDLER
        AX = 0053h
        BX = new state (0000h disabled, 0001h enabled)
Notes:  For FGDRIVER v1.10, this function was "FG_REVMASK" (see AX=0086h);
          "FG_KBINIT" did not exist yet
        When the low-level handler is enabled, "FG_GETKEY", "FG_INTKEY",
          "FG_WAITKEY", and all other functions calling DOS or BIOS keyboard
          services become unavailable
SeeAlso: AX=0054h

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