TOP MICROSYSTEMS, INC.
TOP/ARC-20 COAX BUS
|
NIC Type |
ARCnet |
|
Transfer Rate |
2.5Mbps |
|
Data Bus |
8-bit ISA |
|
Topology |
Star Linear bus |
|
Wiring Type |
RG62A/U 93ohm coaxial (two connectors) |
|
Boot ROM |
Available |
|
NODE ADDRESS |
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|
Node |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
SW2/6 |
SW2/7 |
SW2/8 |
|
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. (On=0, Off=1) |
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|
CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS |
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|
Cable Length |
Response Time |
Reconfiguration Time |
JP1 |
JP2 |
|
|
|
< 20,000 feet |
74.7 m s |
840ms |
Open |
Open |
|
|
> 20,000 feet |
283.4 m s |
1680ms |
Closed |
Open |
|
|
> 20,000 feet |
561.8 m s |
1680ms |
Open |
Closed |
|
|
> 20,000 feet |
1118.6 m s |
1680ms |
Closed |
Closed |
|
Note: All NICs on the network must have this option set the same. |
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|
BOOT ROM |
||
|
Setting |
JP3 |
|
|
|
Disabled |
Open |
|
|
Enabled |
Closed |
|
Note: A 2732 or 2764 boot ROM may be used in the boot ROM socket. If a 2732 is used, the chip must be |
||
|
INTERRUPT REQUEST |
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|
IRQ |
JP4 |
JP5 |
JP6 |
JP7 |
JP8 |
|
|
|
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 |
|
I/O BASE ADDRESS |
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|
Address |
SW1/1 |
SW1/2 |
SW1/3 |
|
|
|
260-26Fh |
On |
On |
On |
|
|
290-29Fh |
On |
On |
Off |
|
|
2E0-2EFh |
On |
Off |
On |
|
|
2F0-2FFh |
On |
Off |
Off |
|
|
300-30Fh |
Off |
On |
On |
|
|
350-35Fh |
Off |
On |
Off |
|
|
380-38Fh |
Off |
Off |
On |
|
|
3E0-3EFh |
Off |
Off |
Off |
|
BASE MEMORY ADDRESS & BOOT ROM ADDRESS |
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|
Base Address |
Boot ROM |
SW1/4 |
SW1/5 |
SW1/6 |
SW1/7 |
SW1/8 |
|
|
|
C0000h |
C2000h |
On |
On |
On |
On |
On |
|
|
C0800h |
C2000h |
On |
On |
On |
On |
Off |
|
|
C1000h |
C2000h |
On |
On |
On |
Off |
On |
|
|
C1800h |
C2000h |
On |
On |
On |
Off |
Off |
|
|
C4000h |
C6000h |
On |
On |
Off |
On |
On |
|
|
C4800h |
C6000h |
On |
On |
Off |
On |
Off |
|
|
C5000h |
C6000h |
On |
On |
Off |
Off |
On |
|
|
C5800h |
C6000h |
On |
On |
Off |
Off |
Off |
|
|
CC000h |
CE000h |
On |
Off |
On |
On |
On |
|
|
CC800h |
CE000h |
On |
Off |
On |
On |
Off |
|
|
CD000h |
CE000h |
On |
Off |
On |
Off |
On |
|
|
CD800h |
CE000h |
On |
Off |
On |
Off |
Off |
|
|
D0000h |
D2000h |
On |
Off |
Off |
On |
On |
|
|
D0800h |
D2000h |
On |
Off |
Off |
On |
Off |
|
|
D1000h |
D2000h |
On |
Off |
Off |
Off |
On |
|
|
D1800h |
D2000h |
On |
Off |
Off |
Off |
Off |
|
|
D4000h |
D6000h |
Off |
On |
On |
On |
On |
|
|
D4800h |
D6000h |
Off |
On |
On |
On |
Off |
|
|
D5000h |
D6000h |
Off |
On |
On |
Off |
On |
|
|
D5800h |
D6000h |
Off |
On |
On |
Off |
Off |
|
|
D8000h |
DA000h |
Off |
On |
Off |
On |
On |
|
|
D8800h |
DA000h |
Off |
On |
Off |
On |
Off |
|
|
D9000h |
DA000h |
Off |
On |
Off |
Off |
On |
|
|
D9800h |
DA000h |
Off |
On |
Off |
Off |
Off |
|
|
DC000h |
DE000h |
Off |
Off |
On |
On |
On |
|
|
DC800h |
DE000h |
Off |
Off |
On |
On |
Off |
|
|
DD000h |
DE000h |
Off |
Off |
On |
Off |
On |
|
|
DD800h |
DE000h |
Off |
Off |
On |
Off |
Off |
|
|
E0000h |
E2000h |
Off |
Off |
Off |
On |
On |
|
|
E0800h |
E2000h |
Off |
Off |
Off |
On |
Off |
|
|
E1000h |
E2000h |
Off |
Off |
Off |
Off |
On |
|
|
E1800h |
E2000h |
Off |
Off |
Off |
Off |
Off |
|
MISCELLANEOUS NOTES |
|
This card may be used in a star topology by terminating one of the BNC connectors. |