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2F4330

Category: memory management
Flags: callout or callback (usually hooked rather than called), Undocumented function

INT 2F - HIMEM.SYS v2.77+ - GET EXTERNAL A20 HANDLER ADDRESS

	AX = 4330h
Return: AL = 80h if external A20 handler provided
	    ES:BX -> external A20 handler (see #02790)
	    CL = A20 detection support
		00h handler is unable to report A20 state
		01h handler supports function 0002h to report A20 state
Note:	HIMEM.SYS calls this function to allow an external program to provide
	  an A20 handler (i.e. to support a machine not supported by HIMEM
	  itself)
SeeAlso: AX=4308h,AX=4310h


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