NORTHGATE COMPUTER SYSTEMS, INC.
NORTHGATE ENERGY STAR LX400A/G REV. 3.1
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
SIS |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
254mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (2), PS/2 mouse port, green PC connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
J3 |
Flash LED |
J10 |
|
Turbo switch |
J4 |
PS/2 mouse port |
J11 |
|
Speaker |
J5 |
Green PC connector |
J12 |
|
Reset switch |
J6 |
Green PC connector (monitor) |
J28 |
|
Power LED & keylock |
J7 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Factory configured - do not alter |
JP1 |
Open |
|
|
Monitor type select color |
JP2 |
Closed |
|
Monitor type select monochrome |
JP2 |
Open | |
|
|
On board mouse enabled |
JP12 |
pins 1 & 2 closed |
|
On board mouse disabled |
JP12 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP13 |
pins 2 & 3 closed |
|
|
Power good signal detect from power supply |
JP14 |
pins 1 & 2 closed |
|
Power good signal detect from board |
JP14 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP21 |
Open |
|
|
Factory configured - do not alter |
JP22 |
Open |
|
|
Factory configured - do not alter |
JP23 |
Open |
|
|
Factory configured - do not alter |
JP100 |
Open |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||||
|
Size |
SR1 |
SR2 |
SR3 |
SR4 |
SR5 |
|
64KB |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
|
128KB |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP6 |
JP7 |
JP8 |
|
80486SX |
Open |
Open |
pins 2 & 3 closed |
|
80487SX |
Closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
80486DX |
Closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486DX2 |
Closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
JP10 |
JP11 |
|
25MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
33MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
40MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
50iMHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
50MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
66iMHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
VESA WAIT STATE CONFIGURATION | ||
|
Wait states |
JP24 |
JP26 |
|
0 wait states |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
1 wait state |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
BUS SPEED CONFIGURATION | ||
|
CPU speed |
JP25 |
JP27 |
|
<= 33MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |