Index for interrupt INT 6D

Table of Contents by Order
6D - INT 6D - VIDEO - many VGA - VIDEO BIOS ENTRY POINT
6D - INT 6D - Trident SVGA - VIDEO BIOS HANDLER
6D - INT 6D - DECnet DOS (before 2.1) - DATA LINK LAYER PROGRAM
6D - INT 6D C - HP Vectra AT - IRQ21 - RESERVED HARDWARE INTERRUPT
6DBD60 - INT 6D U - Matrox Multiple Monitor Support v1.0 - ???
6DBD61 - INT 6D U - Matrox Multiple Monitor Support v1.0 - GET VIDEO MODE INFORMATION
6DBD6F - INT 6D U - Matrox Multiple Monitor Support v1.0 - INSTALLATION CHECK
6DBDFF - INT 6D U - Matrox Multiple Monitor Support v1.0 - UNHOOK INTERRUPT (UNINSTALL)

INT 6D - VIDEO - many VGA - VIDEO BIOS ENTRY POINT
Desc:	points at the original INT 10 entry point set up by the VGA BIOS
Notes:	used by IBM, ATI VGA Wonder, Paradise, Video7, and NCR, and many others
	the Diamond Stealth64 BIOS uses this vector to store the INT 42 vector
	   of the inactive video (see INT 10/AH=12h/BL=35h)
SeeAlso: INT 10/AH=00h,INT 10/AH=0Eh,INT 10/AH=12h/BL=10h

INT 6D - Trident SVGA - VIDEO BIOS HANDLER
Note:	the BIOS INT 10 handler on various Trident VGA cards consists merely
	  of a call to INT 6D followed by an IRET.

INT 6D - DECnet DOS (before 2.1) - DATA LINK LAYER PROGRAM
	AH = function
	???
Return: ???
InstallCheck:	test for a signature area immediately preceding the interrupt
	  handler (see #03734)
SeeAlso: INT 69/AH=0Ah,INT 6C"DECnet",INT 6E"DECnet"
Index:	installation check;DECnet DOS Data Link Layer

Format of DECnet DOS signature area:
Offset	Size	Description	(Table 03734)
 -5	BYTE	major version number
 -4	BYTE	minor version number
 -3   3 BYTEs	signature (ASCII "DLL")

INT 6D C - HP Vectra AT - IRQ21 - RESERVED HARDWARE INTERRUPT
SeeAlso: INT 0D"IRQ5",INT 6C"HP Vectra",INT 6E"HP Vectra"

INT 6D U - Matrox Multiple Monitor Support v1.0 - ???
	AX = BD60h
	DS:SI -> buffer containing ??? (see #03735)
	???
Return: AX = 00BDh if function executed
	   ???:SI -> 22-byte buffer (inside TSR) filled with ??? (see #03735)
	AX unchanged if function disabled
Note:	this function is a NOP if AX=BD6Fh/BL=01h was called
SeeAlso: AX=BD61h,AX=BD6Fh,AX=BDFFh

Format of Matrox ??? buffer:
Offset	Size	Description	(Table 03735)
 00h  4 BYTEs	???
 04h	WORD	video mode width in pixels
 06h	WORD	video mode height in pixels
 08h	BYTE	???
 09h	BYTE	???
 0Ah	BYTE	???
 0Bh	BYTE	flags
		bit 1: ???
		bit 4: ??? (corresponds to bit 14 for AX=BD61h)
		bit 5: ??? (corresponds to bit 15 for AX=BD61h)
 0Ch	DWORD	-> ??? buffer
 10h	WORD	???
		bit 4: ??? (corresponds to bit 14 for AX=BD61h)
		bit 5: ??? (corresponds to bit 15 for AX=BD61h)
 12h  4 BYTEs	???
SeeAlso: #03736

INT 6D U - Matrox Multiple Monitor Support v1.0 - GET VIDEO MODE INFORMATION
	AX = BD61h
	BX = width in pixels (bits 13-0)
	    bit 14: ???
	    bit 15: ???
	CX = height in pixels
Return: AL = BDh if function supported
	    AH = status
		00h successful
		01h failed (resolution/flags not supported)
	    CX:BX -> video mode data structure (see #03736)
		  (first word is FFFFh if unsupported resolution)
	    EAX high word cleared
SeeAlso: AX=BD60h,AX=BD6Fh,AX=BDFFh

Format of Matrox video mode information (VCE structure):
Offset	Size	Description	(Table 03736)
 00h	WORD	width in pixels
 02h	WORD	height in pixels
 04h	WORD	???
 06h	DWORD	dot clock frequency
 0Ah 25 BYTEs	???
SeeAlso: #03735

INT 6D U - Matrox Multiple Monitor Support v1.0 - INSTALLATION CHECK
	AX = BD6Fh
	BL = subfunction
	    00h installation check
	    01h disable TSR
	    02h enable TSR (see AX=BD60h)
Return: AX = 00BDh if installed
SeeAlso: AX=BD60h,AX=BD61h,AX=BDFFh

INT 6D U - Matrox Multiple Monitor Support v1.0 - UNHOOK INTERRUPT (UNINSTALL)
	AX = BDFFh
Return: AX = 00BDh if supported
Note:	this function revectors INT 6D without checking that it points at the
	  TSR, and does not release the memory occupied by the TSR
SeeAlso: AX=BD60h,AX=BD61h,AX=BD6Fh