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Int 7A Fn 09  - IBM 3270 Workstation Program API - Operator Information A  [I]

   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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