Int 21 Fn F8  - Dos V2.11-2.13 - Set Oem Int 21 Handler                    [D]

   AH = F8h
   DS:DX -> OEM INT 21 handler for functions F9h to FFh
        FFFFh:FFFFh disables OEM handler

Notes: this function is known to be supported by Toshiba T1000 ROM MS-DOS
     v2.11, Sanyo MS-DOS v2.11, and TI Professional Computer DOS v2.13
   calls to AH=F9h through AH=FFH will return AL=00h if no handler set
   handler is called with all registers exactly as set by caller, and
     should exit with IRET

See Also: AH=F9h"OEM"