INT 16 - KEYBOARD - AX PC - SET KEYBOARD COUNTRY CODE
        AX = 5000h
        BX = country code
            0001h USA (English), 0051h Japan
Return: AL = status
            00h successful
            01h bad country code
            02h other error
SeeAlso: AX=5001h,INT 10/AX=5000h,INT 17/AX=5000h

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