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INT 21 - PCW Weather Card interface - GET DATA SEGMENT

	AX = 7070h
	BX = 6060h
	CX = 7070h
	DX = 7070h
	SI = 7070h
	DI = 7070h
Return: AX = segment of data structure (see #01776)
Notes:	the data structure is at offset 516 from this segment
	the update byte is at offset 514 from this segment.  Updates are
	  once per second while this byte is nonzero and it is decremented
	  once per second.  While this byte is 0 updates are once per minute.
SeeAlso: AX=7070h/BX=7070h

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