UNIDENTIFIED
486/25 MAINBOARD
Processor | 80486SX |
Processor Speed | 25MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | None (8MB or 16MB on riser card) |
Cache | None (8KB is on the CPU) |
BIOS | Award |
Dimensions | 330mm x 225mm |
I/O Options | None |
NPU Options | 80387DX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | CON1 | Speaker | CON5 |
Turbo LED | CON2 | Power LED & keylock | CON6 |
Turbo switch | CON3 | Riser Card | S1 |
Reset switch | CON4 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Battery type select external | JP1 | pins 2 & 3 closed |
Battery type select internal | JP1 | pins 1 & 2 closed | |
» | Monitor type select monochrome | JP2 | pins 2 & 3 closed |
Monitor type select color | JP2 | pins 1 & 2 closed | |
» | Power good from mainboard | JP3 | pins 2 & 3 closed |
Power good from power supply | JP3 | pins 1 & 2 closed |
DRAM CONFIGURATION | ||
Size | Bank 1 | Bank 2 |
1MB | (36) 41256 | NONE |
2MB | (36) 41256 | (1) 41256 |
4MB | (36) 41000 | NONE |
8MB | (36) 41000 | (36) 41000 |
MEMORY CARD CONFIGURATION | ||||||
Select | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
1MB | On | On | On | On | On | On |
2MB | Off | On | On | On | On | Off |
4MB | Off | Off | On | On | Off | On |
8MB | Off | Off | Off | On | Off | Off |
Note: SW1 is located on the mainboard. |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (4) 256K x 9 | NONE | NONE | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 | NONE | NONE |
4MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 |
4MB | (4) 1M x 9 | NONE | NONE | NONE |
8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
Note: This may be SIMM or SIP |
MEMORY CARD CONFIGURATION | ||||||
Select | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
1MB | On | On | On | On | On | On |
2MB | Off | On | On | On | On | Off |
4MB | Off | Off | On | On | On | Off |
4MB | Off | Off | On | On | Off | On |
8MB | Off | Off | Off | On | Off | Off |
16MB | Off | Off | Off | Off | Off | Off |
Note: SW1 is located on the mainboard. |