Format of DOSMGR patch table:
Offset	Size	Description	)
 00h  2 BYTEs	DOS version (major, minor)
 02h	WORD	offset in DOS data segment of "SAVEDS"
 04h	WORD	offset in DOS data segment of "SAVEBX"
 06h	WORD	offset in DOS data segment of InDOS flag
 08h	WORD	offset in DOS data segment of User ID word
 0Ah	WORD	offset in DOS data segment of "CritPatch" table to enable
		  critical section calls (see INT 2A/AH=80h)
 0Ch	WORD	(DOS 5+ only) offset in DOS data segment of "UMB_HEAD",
		  containing segment of last MCB in conventional memory