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G/NET (REV.03 ONLY)

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)

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