UNIDENTIFIED
80486SX/DX MOTHERBOARD
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
16/20/25/33MHz |
|
Chip Set |
Acer |
|
Max. Onboard DRAM |
32MB |
|
SRAM Cache |
None |
|
BIOS |
AMI/AWARD |
|
Dimensions |
230mm x 220mm |
|
I/O Options |
None |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J4 |
Turbo LED |
J21/pins 1 & 2 |
|
Reset switch |
J19 |
Turbo switch |
J21/pins 4 & 5 |
|
Speaker |
J20 |
Power LED & keylock |
J22 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Monitor type select color |
JP1 |
pins 2 & 3 closed | |
|
Monitor type select monochrome |
JP1 |
pins 1 & 2 closed | |
|
I/O BUS SPEED CONFIGURATION | |||
|
Jumper |
OSC1/5 |
OSC1/6 |
OSC1/8 |
|
JP3 |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
JP6 |
pins 1 & 2 closed |
pins 2 & 3 closed |
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 |
|
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 JUMPER CONFIGURATION | ||
|
CPU |
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 |