
GATEWAY COMMUNICATIONS, INC.

G/NET (REV.03 ONLY)

NIC Type      G-Net
Transfer Rate 2.5Mbps
Data Bus      8-bit ISA
Topology      Linear Bus
Wiring Type   RG--11/U 75ohm coaxial

              RG-59/U 75ohm coaxial

              RG-62A/U 93ohm coaxial
Boot ROM      Not available (optional card required)

[Image]

                 CONNECTORS

       Purpose              Location

  Piggy-back Keycard           CN1

                               NODE ADDRESS

  Node   SW1/1    SW1/2   SW1/3   SW1/4    SW1/5   SW1/6    SW1/7   SW1/8

   0       -       -        -       -       -        -       -        -

   1      Off      On      On      On       On      On       On      On

   2      On      Off      On      On       On      On       On      On

   3      Off     Off      On      On       On      On       On      On

   4      On       On      Off     On       On      On       On      On

  251     Off     Off      On      Off     Off      Off     Off      Off

  252     On       On      Off     Off     Off      Off     Off      Off

  253     Off      On      Off     Off     Off      Off     Off      Off

  254     On      Off      Off     Off     Off      Off     Off      Off

  255     Off     Off      Off     Off     Off      Off     Off      Off

  Note:Node address 0 is used for messaging between nodes and must not be
  used.

       A total of 255 node address settings are available. The switches
       are a binary representation of the decimal node addresses. Switch
       1 is the Least Significant Bit and switch 8 is the Most
       Significant Bit. The switches have the following decimal values:
       switch 1=1, 2=2, 3=4, 4=8, 5=16, 6=32, 7=64, 8=128. Turn off the
       switches and add the values of the off switches to obtain the
       correct node address.

                                CABLE TYPE

                  Type                                  JP1

       RG11/U 75ohm or RG-59/U 75ohm                 Closed

               RG-62A/U 93ohm                          Open

  Note:All NICs on the network must use the same cable type

                             INTERRUPT REQUEST

          IRQ                      JP2                      JP3

              2                   Open               Pins 2 & 3 Closed

              3             Pins 1 & 2 Closed               Open

             4             Pins 2 & 3 Closed               Open

              5                   Open               Pins 1 & 2 Closed

                        BASE MEMORY BUFFER ADDRESS

      Address          SW2/1         SW2/2         SW2/3         SW2/4

         50000h         Off           On            Off           On

         60000h          On           Off           Off           On

         70000h         Off           Off           Off           On

         80000h          On           On            On            Off

         90000h         Off           On            On            Off

         A0000h          On           Off           On            Off

         C0000h          On           On            Off           Off

        D0000h         Off           On            Off           Off

         E0000h          On           Off           Off           Off

                             I/O BASE ADDRESS

       Address           SW2/5        SW2/6        SW2/7         SW2/8

        280h-287h          On           On           On           On

        290h-297h         Off           On           On           On

        2A0h-2A7h          On          Off           On           On

        2B0h-2B7h         Off          Off           On           On

        200h-207h          On           On          Off           On

        2D0h-2D7h         Off           On          Off           On

       2E0h-2E7h          On           On           On           On

        2F0h-2F7h         Off          Off          Off           On

        300h-307h          On           On           On           Off

        310h-317h         Off           On           On           Off

        320h-327h          On          Off           On           Off

        330h-337h         Off          Off           On           Off

        340h-347h          On           On          Off           Off

        350h-357h         Off           On          Off           Off

        360h-367h          On          Off          Off           Off

        370h-377h         Off          Off          Off           Off

