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Int 21 Fn F8 - DOS V2.11 - 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 supported by Toshiba T1000 ROM MS-DOS 2.11
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"
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