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# UNIDENTIFIED
5/486 MOTHERBOARD
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Unknown
Max. Onboard 128MB
DRAM
Cache 128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J2 | Power LED & | JP123 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | JP119 | 32-bit memory | S1 |
| | | expansion slot | |
|------------------+----------+-------------------+----------|
| Turbo switch | JP120 | 32-bit memory | S2 |
| | | expansion slot | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP121 | 32-bit memory | S3 |
| | | expansion slot | |
|------------------+----------+-------------------+----------|
| Speaker | JP122 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | JP31 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP31 | Open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP33 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP33 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | VESA clock normal | JP118 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | VESA clock adjusted | JP118 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED |
|------------------------------------------------------------|
| Speed | JP34 | JP35 | JP36 |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP30 |
|--------------------------+---------------------------------|
| 80486SX | pins 5 & 6 closed |
|--------------------------+---------------------------------|
| 80487SX | pins 1 & 2, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| 80486DX | pins 2 & 3, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| 80486DX2 | pins 2 & 3, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| Pentium Overdrive | pins 1 & 2, 4 & 5, 6 & 7 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | U51, U52, U53, | U55, U56, | TAG | JP58 |
| | U54 | U57, U58 | | |
|-------+----------------+-------------+--------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K | Pins 1 & 2 |
| | | | x 8 | closed |
|-------+----------------+-------------+--------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) | Pins 2 & 3 |
| | | | 32K x | closed |
| | | | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 256K x 9 |
|------------+-----------------------+-----------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------+-----------------------+-----------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------+-----------------------+-----------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------+-----------------------+-----------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------+-----------------------+-----------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------+-----------------------+-----------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------+-----------------------+-----------------------|
| 65MB | (4) 16M x 9 | (4) 256K x 9 |
|------------+-----------------------+-----------------------|
| 68MB | (4) 16M x 9 | (4) 1M x 9 |
|------------+-----------------------+-----------------------|
| 80MB | (4) 16M x 9 | (4) 4M x 9 |
|------------+-----------------------+-----------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+