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. | ||||||