INT 2F U - PTS-DOS - GET MACHINE ID                                             
	AX = 1251h
	???
Return: ???
Note:	This is known to be supported by Paragon Technology Systems PTS-DOS
	  sometime before 6.51, but is known not to be supported by S/DOS 1.0
	  (which derived from PTS-DOS 6.51)
SeeAlso: AX=1250h