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 - HOST SERVICES
        AH = 09h
        BX = 4000h for async request, 8028h for synchronous request
        CX = 0000h
        DX = ID of MFIC
        AL = service
           01h connect to host
           02h disconnect from host
           03h read DFT structured data from host
           04h write DFT structured data to host
           05h create a host buffer
        ES:DI -> control block

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