UNIDENTIFIED
486-EL
|
Processor |
80486SX/80486DX/80486DX2/80486DX4 |
|
Processor Speed |
25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
16MB |
|
Cache |
8KB (on EDRAM modules) |
|
BIOS |
AMI |
|
Dimensions |
250mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (3), green PC connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
JP2 |
Reset switch |
JP27 |
|
Green PC connector |
JP3 |
Power LED & keylock |
JP28 |
|
Turbo LED |
JP25 |
Speaker |
JP30 |
|
Turbo switch |
JP26 |
32-bit VESA local bus slots |
SL1 - SL3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
CMOS memory normal operation |
JP1 |
pins 2 & 3 closed |
|
CMOS memory clear |
JP1 |
pins 1 & 2 closed | |
|
Green PC IRQ select IRQ10 |
JP23 |
pins 1 & 2 closed | |
|
Green PC IRQ select IRQ11 |
JP23 |
pins 2 & 3 closed | |
|
Green PC timer select short time (1.5 minutes) |
JP29 |
Closed | |
|
Green PC timer select long time (8 minutes) |
JP29 |
Open | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
4MB |
4MB |
NONE |
NONE |
NONE |
|
8MB |
4MB |
4MB |
NONE |
NONE |
|
8MB |
8MB |
NONE |
NONE |
NONE |
|
12MB |
4MB |
4MB |
4MB |
NONE |
|
16MB |
4MB |
4MB |
4MB |
4MB |
|
16MB |
8MB |
NONE |
8MB |
NONE |
|
Note: This board is only compatible with EDRAM modules. | ||||
|
CACHE CONFIGURATION | |
|
Memory installed |
Cache installed |
|
4MB |
2KB |
|
8MB |
4KB |
|
8MB |
4KB |
|
12MB |
6KB |
|
16MB |
8KB |
|
16MB |
8KB |
|
Note: Cache is located on EDRAM modules. | |
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP19 |
JP20 |
JP21 |
|
80486SX |
Open |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486DX |
Closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80486DX2 |
Closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80486DX4 |
Closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
CPU SPEED CONFIGURATION | |||
|
Speed |
JP9 |
JP10 |
JP36 |
|
25MHz |
Open |
Closed |
pins 1 & 2 closed |
|
33MHz |
Closed |
Open |
pins 1 & 2 closed |
|
50iMHz |
Open |
Closed |
pins 1 & 2 closed |
|
66iMHz |
Closed |
Open |
pins 1 & 2 closed |
|
75iMHz |
Open |
Closed |
pins 2 & 3 closed |
|
100iMHz |
Closed |
Open |
pins 1 & 2 closed |
|
CPU SPEED CONFIGURATION (80486DX4 ONLY) | |
|
Speed |
JP35 |
|
2x |
pins 1 & 2 closed |
|
2.5x |
pins 2 & 3 closed |
|
3x |
Open |