INT 21 - S/DOS 1.0+ & PTS-DOS 6.51+ - GET 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. REVISION
	AH = 20h
	AL = which 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. code to retrieve
	    00h get PTS 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. code
		Return: CF cleared
			AL = 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. code (currently always 00h)
	    01h get PTS 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. revision code
		Return: CF cleared
			AL = revision code (default is 00h, but may vary)
Desc:	S/DOS is a reduced and modified PTS-DOS 6.51 release with source code
	  on CD
Note:	This function is provided by S/DOS 1.0 (and is most probably also
	  supported with PTS-DOS 6.51+, maybe even earlier).  It clears the
	  CF flag for all other AL arguments, too. However, AL = 00h and 01h
	  are handled separately. The revision code can be individually defined
	  in the MAKEFILE at compilation time.
	The PTS 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. code does not correlate with the DOS 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. code returned
	  by INT 21/AH=30h, likewise the PTS 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. revision does not correlate
	  with the DOS revision returned by INT 21/AX=3306h.
SeeAlso: INT 21/AH=30h,INT 21/AX=3306h