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 |