INT 2F - PRINDIR v9.0 - INSTALLATION CHECK                                      
	AX = 7F00h
Return: AL = FFh if installed
	    BX = version (BH = major, BL = minor)
	    CX:DX -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. signature "PRINDIR"
Range:	AH=7Fh is the default, may be changed at installation time
Note:	prior versions of PRINDIR used INT 7C or INT 7A
SeeAlso: AX=7F01h"PRINDIR",AX=7F02h"PRINDIR",AX=7F03h"PRINDIR"
SeeAlso: AX=7F06h"PRINDIR",AX=7F08h,AX=7F0Ah,AX=7F0Ch,AX=7F0Eh,INT 7C"PRINDIR"