INT 21 - DOS 3.3+ - GET GLOBAL CODE PAGE TABLE
AX = 6601h
Return: CF set on error
AX = error code (see AH=59h)
CF clear if successful
BX = active code page (see AX=6602h)
DX = system code page

See also: 216602

216601 - DOS 3.3+ - GET GLOBAL CODE PAGE TABLE