INT 21 - DOS 3+ - SET COUNTRY CODE
AH = 38h
AL = 01h thru 0FEh for specific country with code <255
AL = FFh for specific country with code >= 255
BX = 16-bit country code
DX = FFFFh
Return: CF set on error
AX = error code (see AH=59h)
CF clear if successful
Note:   not supported by OS/2

See also: 2F1403

2138 - DOS 3+ - SET COUNTRY CODE