GATEWAY COMMUNICATIONS, INC.
G/NET (REV.04 OR ABOVE)
|
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-58/U 50ohm coaxial RG-62A/U 93ohm coaxial Wang style RG-59/U 75ohm dual coaxial |
|
Boot ROM |
Not available (optional card required) |
|
CONNECTORS | |
|
Purpose |
Location |
|
Piggy-back Keycard |
CN1 |
|
CABLE TYPE SELECTION | ||
|
Type |
JP1 | |
|
RG11/U 75ohm or RG-59/U 75ohm |
Pins 2 & 3 Closed | |
|
RG-58/U 50ohm |
Pins 1 & 2 Closed | |
|
RG-62A/U 93ohm |
Open | |
|
INTERRUPT REQUEST | |||
|
IRQ |
JP2 |
JP3 | |
|
3 |
Pins 1 & 2 Closed |
Open | |
|
2 |
Open |
Pins 2 & 3 Closed | |
|
4 |
Pins 2 & 3 Closed |
Open | |
|
5 |
Open |
Pins 1 & 2 Closed | |
|
NODE ADDRESS SELECTION | ||||||||
|
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) | ||||||||
|
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-2E7h |
On |
On |
On |
On | |
|
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 | |
|
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 | |