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 |