X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - attachmate extra

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INT 21 - Attachmate Extra - GET HOST WINDOW BUFFER ADDRESS
        AH = A4h
        AL = window number (1-4=host B-E)
Return: DS:BX -> 3270 display buffer
SeeAlso: AH=A5h,AH=B8h

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