X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 7a - ibm 3270 workstation program api

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INT 7A - IBM 3270 Workstation Program API - OPERATOR INFORMATION AREA
        AH = 09h
        BX = 8020h
        CX = 00FFh
        DX = ID of OIAM
        AL = service
            01h read Operator Information Area
            02h read OIA subset
        ES:DI -> control block
Return: ???
Note: the OIA is the 25th line on the Host session

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