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G/NET (REV.02 AND BELOW)

GATEWAY COMMUNICATIONS, INC.

G/NET (REV.02 AND BELOW)

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)

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

Notes: 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.

(On=0, off=1)

CABLE TYPE

Type

JP1

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

Closed

 

RG-62A/U 93ohm

Open

INTERRUPT REQUEST

IRQ

JP2

JP3

4

Pins 2 & 3 closed

All pins open

 

2

All pins open

Pins 2 & 3 closed

 

3

Pins 1 & 2 closed

All pins open

 

5

All pins open

Pins 1 & 2 closed

BASE MEMORY BUFFER ADDRESS

Address

SW2/1

SW2/2

SW2/3

SW2/4

D0000h

Off

On

Off

Off

 

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

 

E0000h

On

Off

Off

Off

I/O BASE ADDRESS

Address

SW2/5

SW2/6

SW2/7

SW2/8

2E0h-2FFh

Off

Off

Off

On

 

200h-21Fh

On

On

On

On

 

220h-23Fh

Off

On

On

On

 

240h-25Fh

On

Off

On

On

 

260h-27Fh

Off

Off

On

On

 

280h-29Fh

On

On

Off

On

 

2A0h-2BFh

Off

On

Off

On

 

2D0h-2DFh

On

On

On

On

 

300h-31Fh

On

On

On

Off

 

320h-33Fh

Off

On

On

Off

 

340h-35Fh

On

Off

On

Off

 

360h-37Fh

Off

Off

On

Off

 

380h-39Fh

On

On

Off

Off

 

3A0h-3BFh

Off

On

Off

Off

 

3C0h-3DFh

On

Off

Off

Off

 

3E0h-3FFh

Off

Off

Off

Off

CONNECTORS

Purpose

Location

Piggy-back Keycard

CN1