INT 15 U - Toshiba laptops - VCHAD.EXE - INSTALLATION CHECK                     
	AX = CCCCh
Return: AX = ABCDh if installed
Note:	supported by Toshiba VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers. change display utility VCHAD.EXE ver 2.90+
	  older versions have the string "VCHAD" 2 bytes after the address of
	  the INT 15 handler which is hooked by all versions for the SysReq key
SeeAlso: AH=85h