)
Call the Netroom RM386 v6.00 "Reallocate upper memory block" function with:
	AH = 80h
	DX = segment address of UMB to resize
	BX = new size of block in paragraphs
Return: AX = status
	    0001h success
	    0000h failure
		BL = error code (80h,B0h,B2h) (see #02775)
		DX = maximum available size
Note:	this function is identical to function 12h
SeeAlso: #02768,#02784