Int E0  - Dr Multiuser DOS - "a_control" - Get/set Aux Control Parameters  [O]

   CL = B1h
   DS:DX -> AUX device control block (see below)

Return: AX = status
       0000h successful
       control block updated
       FFFFh failed
       CX = error code

See Also: INT E0/CL=B0h,INT E0/CL=B2h

Format of AUX device control block:
Offset Size    Description
 00h   BYTE    function (00h get, 01h set)
 01h   BYTE    DTR state (00h low, 01h high, FFh unknown/don't change)
 02h   BYTE    RTS state (00h low, 01h high, FFh unknown/don't change)
 03h   BYTE    DSR state (00h low, 01h high, FFh unknown/don't change)
 04h   BYTE    CTS state (00h low, 01h high, FFh unknown/don't change)
 05h   BYTE    DCD state (00h low, 01h high, FFh unknown/don't change)
 06h   BYTE    RI state (00h inactive, 01h active, FFh unknown/don't change)