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EARTHNET-1

ALLOY COMPUTER PRODUCTS, INC.

EARTHNET-1

NIC Type

Arcnet

Transfer Rate

2.5Mbps

Data Bus

8-bit ISA

Topology

Star

Wiring Type

RG-62A/U 93ohm coaxial

Boot ROM

Available

NODE ADDRESS SELECTION

Address

SW2/1

SW2/2

SW2/3

SW2/4

SW2/5

SW2/6

SW2/7

SW2/8

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

5

Off

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: A total of 255 node address settings are available. The switches are a binary representation of the decimal node addresses. switch SW2/1 is the Least Significant Bit and jumper SW2/8 is the Most Significant Bit. The switches have the following decimal values: jumper SW2/1=1, SW2/2=2, SW2/3=4, SW2/4=8, SW2/5=16, SW2/6=32, SW2/7=64, SW2/8=128.Open the switches and add the values of the open jumpers to obtain the correct node address. (On=0, Off=1)

BASE I/O ADDRESS SELECTION

Address

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

2E0h

Off

Off

Off

Off

Off

On

 

200h

Off

On

On

On

On

On

 

210h

Off

On

On

On

On

Off

 

220h

Off

On

On

On

Off

On

 

230h

Off

On

On

On

Off

Off

 

240h

Off

On

On

Off

On

On

 

3B0h

Off

Off

Off

On

Off

Off

 

3C0h

Off

Off

Off

Off

On

On

 

3D0h

Off

Off

Off

Off

On

Off

 

3E0h

Off

Off

Off

Off

Off

On

 

3F0h

Off

Off

Off

Off

Off

Off

Note: Addresses from 0h to 3F0h are possible, but those below 200h are not normally used. The sum of SW1/1 and SW1/2 represent the first digit. The sum of SW1/3-6 represent the second digit. The last digit is always zero. SW1/1=200h, SW1/2=100h, SW1/3=80h, SW1/4=40h, SW1/5=20h, SW/6=10h.

INTERRUPT SELECTION

IRQ

JP2/1

JP2/2

JP2/3

JP2/4

JP2/5

2

Closed

Open

Open

Open

Open

 

3

Open

Closed

Open

Open

Open

 

4

Open

Open

Closed

Open

Open

 

5

Open

Open

Open

Closed

Open

 

7

Open

Open

Open

Open

Closed

SHARED RAM ADDRESS

Address

SW1/7

SW1/8

SW1/9

SW1/10

JP1/1

JP1/2

JP1/3

JP1/4

A0000h

Off

On

Off

On

Open

Open

Open

Open

A4000h

Off

On

Off

On

Open

Open

Closed

Open

A8000h

Off

On

Off

On

Open

Open

Open

Closed

B0000h

Off

On

Off

Off

Open

Open

Open

Open

B4000h

Off

On

Off

Off

Open

Open

Closed

Open

B8000h

Off

On

Off

Off

Open

Open

Open

Closed

C0000h

Off

Off

On

On

Open

Open

Open

Open

C4000h

Off

Off

On

On

Open

Open

Closed

Open

C8000h

Off

Off

On

On

Open

Open

Open

Closed

D0000h

Off

Off

On

Off

Open

Open

Open

Open

D4000h

Off

Off

On

Off

Open

Open

Closed

Open

D8000h

Off

Off

On

Off

Open

Open

Open

Closed

E0000h

Off

Off

Off

On

Open

Open

Open

Open

E4000h

Off

Off

Off

On

Open

Open

Closed

Open

E8000h

Off

Off

Off

On

Open

Open

Open

Closed

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

LED1

Unidentified

On

Data is being transmitted/received

LED1

Unidentified

Off

Data is not being transmitted/received

LED2

Unidentified

On

Network connection is good

LED2

Unidentified

Off

Network connection is broken

Note: Continuous pulsing of LED2 indicates network error or node address conflict.