INT 10 - VIDEO - MSHERC.COM - GET VIDEO ADAPTER TYPE AND MODE                   
	AH = EFh
Return: DL = video adapter type
	    00h original Hercules
	    01h Hercules Plus	 (port 03BAh reads x001xxxxx)
	    02h Hercules InColor (port 03BAh reads x101xxxxx)
	    FFh not a Hercules-compatible card (port 03BAh bit 7 not pulsing)
	DH = memory mode byte
	    00h "half" mode
	    01h "full" mode
	    FFh not a Hercules-compatible card
Program: MSHERC.COM/QBHERC.COM is a support program for the Microsoft Quick
	  languages which makes their graphics libraries compatible with a
	  Hercules card by adding video modes 08h and 88h, and supporting
	  text in the new graphics modes.
Notes:	while in mode 08h or 88h, INT 10 supports the Hercules card much like
	  a CGAColor Graphics Adapter(Color/Graphics Adapter) One of the two video display boards introduced together with the original IBMInternational Busiuness Machines PCIBM PC.  See also HGC, MDA..
	MSHERC performs an installation check by setting DL=FFh and testing
	  whether it has been changed on return, which causes it to reinstall
	  itself when no HGC(Hercules Graphics Card) A monochrome video adapter capable of 720x352 monochrome graphics.	 The HGC was the first non-IBM video adapter for the IBMInternational Busiuness Machines PCIBM PC.	 See also CGAColor Graphics Adapter, MDA. is present (or HGC(Hercules Graphics Card) A monochrome video adapter capable of 720x352 monochrome graphics.	 The HGC was the first non-IBM video adapter for the IBMInternational Busiuness Machines PCIBM PC.	 See also CGAColor Graphics Adapter, MDA. emulation has temporarily been
	  disabled); a better installation check would be to use DX=80FFh and
	  check whether DX has been changed
	reportedly returns DH=00h on some not-entirely-Hercules-compatible
	  cards
Index:	installation check;MSHERC