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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486PA
Processor 80486SX/80486DX/80486DX2
Processor Speed 16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set OPTi
Max. Onboard DRAM 32MB
Cache 64/128/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J1 | Turbo switch | J4 |
|---------------------+----------+----------------+----------|
| Reset switch | J2 | Turbo LED | J5 |
|---------------------+----------+----------------+----------|
| Speaker | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select color | J23 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | J23 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 32K x 1 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (2) 32K x 1 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 32K x 1 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (2) 32K x 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP17 | JP18 | JP19 |
|---------+-------------------+----------+---------+---------|
| 64KB | pins 2 & 3 closed | Open | Open | Open |
|---------+-------------------+----------+---------+---------|
| 128KB | pins 1 & 2 closed | Closed | Open | Open |
|---------+-------------------+----------+---------+---------|
| 256KB | pins 2 & 3 closed | Closed | Closed | Open |
|---------+-------------------+----------+---------+---------|
| 512KB | pins 1 & 2 closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J7 |
|----------------------------+-------------------------------|
| 80486SX | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 80486DX | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 80486DX2 | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J6 |
|------------------------------+-----------------------------|
| 16MHz | Closed |
|------------------------------+-----------------------------|
| 20MHz | Closed |
|------------------------------+-----------------------------|
| 25MHz | Open |
|------------------------------+-----------------------------|
| 33MHz | Open |
|------------------------------+-----------------------------|
| 50iMHz | Open |
|------------------------------+-----------------------------|
| 50MHz | Open |
|------------------------------+-----------------------------|
| 66iMHz | Open |
+------------------------------------------------------------+