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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. At least potentially this is still available with (OEM versions??? of) MS-DOS 6.0.. Calls to AH=F9h through AH=FFH will return AL=00h if no handler set. The user handler is called immediately on entry to the main DOS INT 21h function dispatcher with interrupts disabled and all registers and stack exactly as set by caller; it should exit with IRET
See Also: AH=F9h"OEM"
Category: DOS Kernel - Int 21h - D
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