UNIDENTIFIED
486SX-DX MAINBOARD
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
33/40/50/66(internal)MHz |
|
Chip Set |
Unidentifed |
|
Max. Onboard DRAM |
32MB |
|
Cache |
None |
|
BIOS |
Award |
|
Dimensions |
254mm x 220mm |
|
I/O Options |
Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
CN1 |
Power LED & keylock |
J1 |
|
Parallel port |
CN2 |
Turbo switch |
J2 pins 1 & 2 |
|
Serial port 1 |
CN3 |
Turbo LED |
J2 pins 4 & 5 |
|
Serial port 2 |
CN4 |
Speaker |
J3 |
|
PS/2 mouse port |
CN5 |
Reset switch |
J4 |
|
IDE interface |
CN6 |
IDE interface LED |
J5 |
|
Floppy drive interface |
CN7 |
Riser Card |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Video mode select interlaced |
JP7 |
Closed |
|
Video mode select non-interlaced |
JP7 |
Open | |
|
|
Monitor type select monochrome |
JP10 |
Closed |
|
Monitor type select color |
JP10 |
Open | |
|
|
CPU OSC select 66MHz |
jp11 |
pins 2 & 3 closed |
|
CPU OSC select 50MHz |
jp11 |
pins 1 & 2 closed | |
|
|
On board VGA enabled |
JP12 |
pins 2 & 3 closed |
|
On board VGA disabled |
JP12 |
pins 1 & 2 closed | |
|
|
Monitor type select VESA |
JP14 |
pins 2 & 3 closed |
|
Monitor type select VGA |
JP14 |
pins 1 & 2 closed | |
|
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 |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CPU TYPE CONFIGURATION | ||
|
Type |
JP4 |
JP5 |
|
80486SX |
Open |
pins 1 & 2 closed |
|
80487SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80486DX |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80486DX2 |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
JP3 |
JP6 |
|
33MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
40MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
50MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
66iMHz |
pins 1 & 2 closed |
pins 1 & 2 closed |