INT 21 - DOS v2.11-2.13 - SET OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. INT 21 HANDLER
	AH = F8h
	DS:DX -> OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. INT 21 handler for functions F9h to FFh
		 FFFFh:FFFFh disables OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. handler
Notes:	this function is known to be supported by Toshiba T1000 ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. 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(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. 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
SeeAlso: AH=F9h"OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor."