
3COM CORPORATION

ETHERLINK PLUS (3C505B; ASSY.#2012)

NIC Type      Ethernet
Transfer Rate 10Mbps
Data Bus      16-bit ISA
Topology      Linear Bus
Wiring Type   RG-58A/U 50ohm coaxial

              AUI transceiver via DB-15 port
Boot ROM      Available

[Image]

                           CABLE TYPE SELECTION

                   Type                              JP45 - JP51

           RG-58A/U 50ohm coaxial                Pins 2 & 3 Closed

        AUI transceiver via DB-15 port            Pins 1 & 2 Closed

                                      INTERRUPT REQUEST SELECTION

  IRQ   JP29     JP30     JP31     JP32     JP33    JP34     JP35     JP36     JP37     JP38     JP39

  2     Open     Open     Open     Open     Open    Open     Open     Open     Open     Open    Closed

  3     Open     Open     Open     Open     Open    Closed   Open     Open     Open     Open     Open

  4     Open     Open     Open     Open     Open    Open     Closed   Open     Open     Open     Open

  5     Open     Open     Open     Open     Open    Open     Open     Closed   Open     Open     Open

  6     Open     Open     Open     Open     Open    Open     Open     Open     Closed   Open     Open

  7     Open     Open     Open     Open     Open    Open     Open     Open     Open    Closed    Open

  10    Open     Open     Open     Open    Closed   Open     Open     Open     Open     Open     Open

  11    Open     Open     Open    Closed    Open    Open     Open     Open     Open     Open     Open

  12    Open     Open    Closed    Open     Open    Open     Open     Open     Open     Open     Open

  14    Closed   Open     Open     Open     Open    Open     Open     Open     Open     Open     Open

  15    Open    Closed    Open     Open     Open    Open     Open     Open     Open     Open     Open

                              DMA CHANNEL SELECTION

  Channel    JP21     JP22     JP23     JP24     JP25    JP26     JP27     JP28

  Disabled   Open     Open     Open     Open     Open    Open     Closed   Closed

     5       Open     Open     Open     Open    Closed   Closed   Open     Open

     6       Open     Open    Closed   Closed    Open    Open     Open     Open

     7       Closed  Closed    Open     Open     Open    Open     Open     Open

                        I/O BASE ADDRESS SELECTION

   Address       JP4       JP5       JP6       JP7       JP8       JP9

    200h        Pins 1    Pins 1    Pins 1    Pins 1    Pins 1   Pins 2 &
                 & 2       & 2       & 2       & 2       & 2        3

    210h        Pins 2    Pins 1    Pins 1    Pins 1    Pins 2   Pins 1 &
                 & 3       & 2       & 2       & 2       & 3        2

    220h        Pins 1    Pins 2    Pins 1    Pins 1    Pins 1   Pins 2 &
                 & 2       & 3       & 2       & 2       & 2        3

    230h        Pins 2    Pins 2    Pins 1    Pins 1    Pins 1   Pins 2 &
                 & 3       & 3       & 2       & 2       & 2        3

    240h        Pins 1    Pins 1    Pins 2    Pins 1    Pins 1   Pins 2 &
                 & 2       & 2       & 3       & 2       & 2        3

    250h        Pins 2    Pins 1    Pins 2    Pins 1    Pins 1   Pins 2 &
                 & 3       & 2       & 3       & 2       & 2        3

    260h        Pins 1    Pins 2    Pins 2    Pins 1    Pins 1   Pins 2 &
                 & 2       & 3       & 3       & 2       & 2        3

    270h        Pins 2    Pins 2    Pins 2    Pins 2    Pins 1   Pins 2 &
                 & 3       & 3       & 3       & 3       & 2        3

    280h        Pins 1    Pins 1    Pins 1    Pins 2    Pins 1   Pins 2 &
                 & 2       & 2       & 2       & 3       & 2        3

    290h        Pins 2    Pins 1    Pins 1    Pins 2    Pins 1   Pins 2 &
                 & 3       & 2       & 2       & 3       & 2        3

    2A0h        Pins 1    Pins 2    Pins 1    Pins 2    Pins 1   Pins 2 &
                 & 2       & 3       & 2       & 3       & 2        3

    2B0h        Pins 2    Pins 2    Pins 1    Pins 2    Pins 1   Pins 2 &
                 & 3       & 3       & 2       & 3       & 2        3

    2C0h        Pins 1    Pins 1    Pins 2    Pins 2    Pins 1   Pins 2 &
                 & 2       & 2       & 3       & 3       & 2        3

    2D0h        Pins 2    Pins 1    Pins 2    Pins 2    Pins 1   Pins 2 &
                 & 3       & 2       & 3       & 3       & 2        3

    2E0h        Pins 1    Pins 2    Pins 2    Pins 2    Pins 1   Pins 2 &
                 & 2       & 3       & 3       & 3       & 2        3

    2F0h        Pins 2    Pins 2    Pins 2    Pins 2    Pins 1   Pins 2 &
                 & 3       & 3       & 3       & 3       & 2        3

    300h        Pins 1    Pins 1    Pins 1    Pins 1    Pins 2   Pins 2 &
                 & 2       & 2       & 2       & 2       & 3        3

    310h        Pins 2    Pins 1    Pins 1    Pins 1    Pins 2   Pins 2 &
                 & 3       & 2       & 2       & 2       & 3        3

    320h        Pins 1    Pins 2    Pins 1    Pins 1    Pins 2   Pins 2 &
                 & 2       & 3       & 2       & 2       & 3        3

    330h        Pins 2    Pins 2    Pins 1    Pins 1    Pins 2   Pins 2 &
                 & 3       & 3       & 2       & 2       & 3        3

    340h        Pins 1    Pins 1    Pins 2    Pins 1    Pins 2   Pins 2 &
                 & 2       & 2       & 3       & 2       & 3        3

    350h        Pins 2    Pins 1    Pins 2    Pins 1    Pins 2   Pins 2 &
                 & 3       & 2       & 3       & 2       & 3        3

    360h        Pins 1    Pins 2    Pins 2    Pins 1    Pins 2   Pins 2 &
                 & 2       & 3       & 3       & 2       & 3        3

    370h        Pins 2    Pins 1    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 3       & 2       & 3       & 3       & 3        3

    380h        Pins 1    Pins 1    Pins 1    Pins 2    Pins 2   Pins 2 &
                 & 2       & 2       & 2       & 3       & 3        3

    390h        Pins 2    Pins 1    Pins 1    Pins 2    Pins 2   Pins 2 &
                 & 3       & 2       & 2       & 3       & 3        3

    3A0h        Pins 1    Pins 2    Pins 1    Pins 2    Pins 2   Pins 2 &
                 & 2       & 3       & 2       & 3       & 3        3

    3B0h        Pins 1    Pins 2    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 2       & 3       & 3       & 3       & 3        3

    3C0h        Pins 1    Pins 1    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 2       & 2       & 3       & 3       & 3        3

    3D0h        Pins 2    Pins 1    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 3       & 2       & 3       & 3       & 3        3

    3E0h        Pins 1    Pins 2    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 2       & 3       & 3       & 3       & 3        3

    3F0h        Pins 2    Pins 2    Pins 2    Pins 2    Pins 2   Pins 2 &
                 & 3       & 3       & 3       & 3       & 3        3

  Note:Pins designated should be in the closed position.

                        BOOT ROM ADDRESS SELECTION

  Address     JP13     JP14     JP15     JP16     JP17    JP18      JP19

   CC000h     Pins 2  Pins 1   Pins 1   Pins 2   Pins 2   Pins 1   Pins 1
               & 3     & 2      & 2      & 3      & 3      & 2      & 2

   EC000h     Pins 2  Pins 2   Pins 1   Pins 2   Pins 2   Pins 1   Pins 1
               & 3     & 3      & 2      & 3      & 3      & 2      & 2

  Note:Pins designated should be in the closed position.

                          BOOT ROM CONFIGURATION

                Setting                                JP12

                 Disabled                       Pins 1 & 2 Closed

                   Enabled                       Pins 2 & 3 Closed

