INT 15 - Tandy??? - ???                                                         
	AH = E4h
	AL = subfunction
	    21h, 89h, 8Ah, 8Bh called by 386MAX v6.01
	DL = ???
Return: DL = 00h if successful???
Note:	the section of code in 386MAX which calls these functions also checks
	  whether the ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. has both Tandy and Phoenix Technologies
	  signatures if these calls fail; the Tandy 1000SL/TL BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. does not
	  support this function, however, returning the usual CF set/AH=86h for
	  "unsupported function".
                                                                                

INT 15 - Compaq ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. 1993/08/03 and newer - ???
	AH = E4h
	AL = subfunction
	    00h get advanced system info
		Return: CF clear
			AH = 00h
			CX = 0000h
			BX = advanced system info flags (read from [XBDAsee Extended BIOS Data Area:0094h])
			     bit 4: "mode 2" (dual harddisk controller) enabled
	    01h,02h unsupported by this ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. version
		Return: CF set, AH = 86h
	    80h set advanced system info
		BX = advanced system info flags
		     bit 4: enable "mode 2" (dual harddisk controller)
		???
		Return: ???
		Note:	On Compaq machines with "COMPAQ" signature at
			  F000h:FFEAh (see also MEM F000h:FFE0h), MS-DOS/PCIBM PC DOS
			  IO.SYS/IBMBIO.COM use	this function to set bit 4
			  before calling INT 13h/AH=08h to retrieve the number
			  of hard disks installed (DL).
	    90h,A0h,B0h,C0h,D0h,E0h,F0h set ???
		Return: CF clear
			AH = 00h
			CX = 0000h
			BX = ???
	    81h,91h,A1h,B1h,C1h,D1h,E1h,F1h unsupported by 3/8/93&4/8/93 ROMs
		Return: CF set, AH = 86h
Notes:	functions 80h/90h/etc. are not supported by the 4/8/93 EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). System ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs.
	these functions are not supported by the 7/26/93 LTE Lite 386 ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs.