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ARCNET PC220

STANDARD MICROSYSTEMS CORPORATION

ARCNET PC220

NIC Type

ARCnet

Network Transfer Rate

2.5Mbps

Data Bus

16-bit ISA

Topology

Linear Bus

Wiring Type

RG-62A/U 93ohm coaxial

Boot ROM

Available

CONNECTIONS

Function

Label

RG-62A/U 93ohm coaxial port

J1

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

EXT

Open

Boot ROM enabled

ROM

Closed

 

Boot ROM disabled

ROM

Open

Note: Jumper EXT is used to configure the network time-out settings, these two jumpers are normally left open, however for additional settings refer to the COM 9026 Data Sheet.

NODE ADDRESS SELECTION

Setting

S1/1

S1/2

S1/3

S1/4

S1/5

S1/6

S1/7

S1/8

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 memory addresses. SW1/8 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/8=128, SW1/7=64, SW1/6=32, SW1/5=16, SW1/4=8, SW1/3=4, SW1/2=2, SW1/1=1. Turn off the switches and add the values of the switches to obtain the correct node address.

BASE I/O ADDRESS SELECTION

Address

S2/6

S2/5

S2/4

S2/3

S2/2

S2/1

0h

On

On

On

On

On

On

10h

On

On

On

On

On

Off

20h

On

On

On

On

Off

On

30h

On

On

On

On

Off

Off

40h

On

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: A total of 64 Base I/O address settings are available. The switches are a binary representation of the decimal memory addresses. SW2/1 is the Most Significant Bit and switch SW2/6 is the Least Significant Bit. The switches have the following decimal values: SW2/1=512, SW2/2=256, SW2/3=128, SW2/4=64, SW2/5=32, SW2/6=16. Turn off the switches and add the values of the switches to obtain the correct node address.

INTERRUPT SELECTION

IRQ

IRQ/A

IRQ/B

IRQ/C

IRQ/D

IRQ/E

2/9

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

BASE MEMORY ADDRESS SELECTION

Address

SW3/1

SW3/2

SW3/3

SW3/4

SW3/5

SW3/6

SW3/7

SW3/8

000h

On

On

On

On

On

On

On

On

800h

On

On

On

On

On

On

On

Off

1000h

On

On

On

On

On

On

Off

On

1800h

On

On

On

On

On

On

Off

Off

4000h

On

On

On

On

On

Off

On

On

4800h

On

On

On

On

On

Off

On

Off

5000h

On

On

On

On

On

Off

Off

On

5800h

On

On

On

On

On

Off

Off

Off

8000h

On

On

On

On

Off

On

On

On

8800h

On

On

On

On

Off

On

On

Off

9000h

On

On

On

On

Off

On

Off

On

9800h

On

On

On

On

Off

On

Off

Off

C000h

On

On

On

On

Off

Off

On

On

C800h

On

On

On

On

Off

Off

On

Off

D000h

On

On

On

On

Off

Off

Off

On

D800h

On

On

On

On

Off

Off

Off

Off

F0000h

Off

Off

Off

Off

On

On

On

On

F0800h

Off

Off

Off

Off

On

On

On

Off

F1000h

Off

Off

Off

Off

On

On

Off

On

F1800h

Off

Off

Off

Off

On

On

Off

Off

F4000h

Off

Off

Off

Off

On

Off

On

On

F4800h

Off

Off

Off

Off

On

Off

On

Off

F5000h

Off

Off

Off

Off

On

Off

Off

On

F5800h

Off

Off

Off

Off

On

Off

Off

Off

F8000h

Off

Off

Off

Off

Off

On

On

On

F8800h

Off

Off

Off

Off

Off

On

On

Off

F9000h

Off

Off

Off

Off

Off

On

Off

On

F9800h

Off

Off

Off

Off

Off

On

Off

Off

FC000h

Off

Off

Off

Off

Off

Off

On

On

FC800h

Off

Off

Off

Off

Off

Off

On

Off

FD000h

Off

Off

Off

Off

Off

Off

Off

On

FD800h

Off

Off

Off

Off

Off

Off

Off

Off

Note: The above table includes only a few of the many memory address settings available. The switches are a binary representation of the decimal memory addresses. SW3/1 is the Most Significant Bit and switch SW3/8 is the Least Significant Bit. The switches have the following decimal values: SW3/8=2048, SW3/7=4096, SW3/6=16384, SW3/5=32768, SW3/4=65536, SW3/3=131072, SW3/2=262144, SW3/1=524288. Turn off the switches and add the values of the switches to obtain the correct address.

Notice that there is no switch representation for 8192 decimal. This means that 02000h, 03000h, 06000h, 07000h, 0A000h, 0B000h and 0E000h cannot be represented. Omissions in the above table reflect this.