Index for interrupt INT 42

Table of Contents by Order
42 - INT 42 - VIDEO - RELOCATED DEFAULT INT 10 VIDEO SERVICES (EGA,VGA)
42 - INT 42 - Z100 - Master 8259 - Timer
42 - INT 42 - TI Professional PC - IRQ2
42 - INT 42 - Western Digital WD1002 SuperBIOS - INT 40 CASCADE
42 - INT 42 - Acorn BBC Master 512 - "OSBPUT" - WRITE SINGLE BYTE TO FILE
425F33 - INT 42 C - Chips & Technologies '65530' BIOS - MODE SET HOOK
427500 - INT 42 U - Toshiba laptops - ???
427501 - INT 42 U - Toshiba laptop - GET ??? DATA
427502 - INT 42 U - Toshiba laptops - SET ??? DATA
427503 - INT 42 - Toshiba laptops - GET DISPLAY STATUS
427504 - INT 42 U - Toshiba laptops - ???

INT 42 - VIDEO - RELOCATED DEFAULT INT 10 VIDEO SERVICES (EGA,VGA)
Desc:	contains the address of the original INT 10 handler which an EGA+
	  video adapter replaces with its own on-board BIOS code
SeeAlso: INT 10/AH=00h,INT 10/AH=0Eh,INT 6D"VGA"
Note:	not used by PS/2 built-in VGA or XGA

INT 42 - Z100 - Master 8259 - Timer
SeeAlso: INT 41"Z100",INT 43"Z100"

INT 42 - TI Professional PC - IRQ2
Note:	on the TI Pro, IRQ0 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ4
SeeAlso: INT 0C"IRQ4",INT 41"TI Professional",INT 43"TI Professional"

INT 42 - Western Digital WD1002 SuperBIOS - INT 40 CASCADE
Note:	if the second WD1002 controller in the system finds INT 40 already in
	  use, it uses this vector to cascade to the first controller's BIOS
SeeAlso: INT 40"DISKETTE",INT 47"SuperBIOS"

INT 42 - Acorn BBC Master 512 - "OSBPUT" - WRITE SINGLE BYTE TO FILE
	AL = byte to be written
	BH = file handle
Return: flags destroyed
SeeAlso: INT 40"Acorn",INT 41"Acorn",INT 43"Acorn",INT 47"Acorn",INT 49"Acorn"

INT 42 C - Chips & Technologies '65530' BIOS - MODE SET HOOK
	AX = 5F33h
	BL = current width in characters
	BH = curent video mode
	CH = active display page
Return:	nothing
Desc:	this function is called at the end of a video mode set
Note:	the OEM has the option of enabling or disabling this callout, as well
	  as specifying whether the callout occurs on INT 15h or INT 42h
SeeAlso: INT 15/AX=5F31h,INT 15/AX=5F35h,INT 10/AX=5F50h,INT 15/AX=5F33h

INT 42 U - Toshiba laptops - ???
	AX = 7500h
	BL = ??? (00h or 01h)
Return: ???
Note:	used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7501h,AX=7503h

INT 42 U - Toshiba laptop - GET ??? DATA
	AX = 7501h
	DS:DI -> data area to be filled ???
Return: area filled with data ???
Note:	used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7500h,AX=7502h,AX=7503h

INT 42 U - Toshiba laptops - SET ??? DATA
	AX = 7502h
	DS:DI -> data area ???
Return: ???
Note:	used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7501h,AX=7503h

INT 42 - Toshiba laptops - GET DISPLAY STATUS
	AX = 7503h
Return: AX = 7575h if supported
	CX = 0001h if supported
	BH = display type (00h color, 03h monochrome)
	BL = display state
	    01h internal LCD display is active
	    02h external VGA display is active
	    03h both displays active / DeskStation display mode enabled
		(not possible on all machines)
Note:	used by VCHAD.EXE and supported by all Toshiba VGA laptops until about
	  1994 (string "TOSHIBA " at F000:E010h should be checked before call)
	no longer supported by T21xx series, use INT 10/AX=5F50h instead
	INT 42 normally points to F000:F065h but may be redirected by QEMM386
SeeAlso: AX=7500h,AX=7504h,INT 10/AX=5F50h,INT 15/AH=C0h

INT 42 U - Toshiba laptops - ???
	AX = 7504h
	BL = ???
Return: BH = ???
Note:	used by Toshiba utility VCHAD.EXE
SeeAlso: AX=7500h,AX=7503h