U.S. ROBOTICS, INC.

HIGH SPEED DUAL ASYNCHRONOUS SERIAL BOARD

Card Type          Serial card
Chipset Controller 165550AN UART
I/O Options        Serial port (2)
Maximum DRAM       N/A

[Image]

                            CONNECTIONS

        Purpose          Location         Purpose          Location

  9-pin serial port        CN1      9-pin serial port        CN2

                    SERIAL PORT CHANNEL A CONFIGURATION

     Setting            J1            J2            J3            J4

  »      COM1:      Pins 1 & 2       Open          Open          Open
        (3F8h)        closed

         COM2:         Open       Pins 1 & 2       Open          Open
        (3E8h)                      closed

         COM3:         Open          Open       Pins 1 & 2       Open
        (2F8h)                                    closed

         COM4:         Open          Open          Open       Pins 1 & 2
        (2E8h)                                                  closed

                    SERIAL PORT CHANNEL B CONFIGURATION

     Setting            J1            J2            J3            J4

  »      COM2:         Open       Pins 2 & 3       Open          Open
        (3E8h)                      closed

         COM1:      Pins 2 & 3       Open          Open          Open
        (3F8h)        closed

         COM3:         Open          Open       Pins 2 & 3       Open
        (2F8h)                                    closed

         COM4:         Open          Open          Open       Pins 2 & 3
        (2E8h)                                                  closed

                       CHANNEL A INTERRUPT SELECTION

    IRQ         J5/A         J5/B        J5/C         J5/D        J5/E

  »     4       Open         Open       Closed        Open        Open

        2      Closed        Open        Open         Open        Open

        3       Open        Closed       Open         Open        Open

        5       Open         Open        Open        Closed       Open

        7       Open         Open        Open         Open       Closed

                       CHANNEL B INTERRUPT SELECTION

    IRQ         J6/A         J6/B        J6/C         J6/D        J6/E

  »     3       Open        Closed       Open         Open        Open

        2      Closed        Open        Open         Open        Open

        4       Open         Open       Closed        Open        Open

        5       Open         Open        Open        Closed       Open

        7       Open         Open        Open         Open       Closed