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

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INT 21 - Attachmate Extra - DISABLE HOST BUFFER UPDATES
        AH = B8h
        AL = window number (1-4=host B-E)
        DL = 01h
Notes:  only valid in CUT mode
        next AID keystroke (eg Enter) enables host buffer updates
SeeAlso: AH=A4h

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