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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486QS
Processor 80486SX/80486DX
Processor Speed 20/25/33MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI/MR
Dimensions 330.2mm x 218.4mm
I/O Options 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Reset switch | J3 | Turbo LED | JP7 |
|--------------+----------+-----------------------+----------|
| Turbo switch | J4 | External battery | JP9 |
|--------------+----------+-----------------------+----------|
| Speaker | JP2 | 32-bit external | S1 |
| | | memory card | |
|--------------+----------+-----------------------+----------|
| Power LED & | JP6 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP8 | Closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP8 | Open |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP26 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP26 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CPU type select 80486SX | JP31 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU type select 80486DX | JP31 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 16K x 4 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (2) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP18 | JP19 | JP20 | JP21 | JP22 |
|-------+--------+--------+--------------+----------+--------|
| 64KB | Open | Open | pins 2 & 3 | pins 2 & | Open |
| | | | closed | 3 closed | |
|-------+--------+--------+--------------+----------+--------|
| 256KB | Closed | Closed | pins 1 & 2 | pins 1 & | Closed |
| | | | closed | 2 closed | |
|------------------------------------------------------------|
| Note: Main board may be factory configured with 256KB |
| cache in which case JP18 - JP22 will not be present |
+------------------------------------------------------------+