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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486VT
Processor 80486SX/80487SX/CX486S/CX486S2/80486DX/
80486DX2/Pentium Overdrive
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set UMC
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 230mm 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 & | J9 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo LED | J5 | 32-bit VESA Local | S1 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Reset switch | J6 | 32-bit VESA Local | S2 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Turbo switch | J7 | 32-bit VESA Local | S3 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Speaker | J8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | J3 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J3 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select CGA | J11 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select all others | J11 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W0 | W1 | W2 | W3 | W4 |
|-------+------------+--------+--------+----------+----------|
| 64KB | pins 1 & 2 | Open | Open | pins 1 & | pins 1 & |
| | | | | 2 | 2 |
|-------+------------+--------+--------+----------+----------|
| 128KB | pins 1 & 2 | Closed | Open | pins 2 & | pins 2 & |
| | | | | 3 | 3 |
|-------+------------+--------+--------+----------+----------|
| 256KB | pins 2 & 3 | Closed | Closed | pins 1 & | pins 2 & |
| | | | | 2 | 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP10 | W6 |
|-----------------+--------+----------------+----------------|
| 80486SX | Open | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| 80487SX | Open | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| CX486S | Open | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| CX486S2 | Closed | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| 80486DX | Open | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| 80486DX2 | Open | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| Pentium | Open | pins 2 & 3 | pins 1 & 2 |
| Overdrive | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP2 | JP6 | W5 |
|--------------+-------------------+------------+------------|
| 20MHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 25MHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 33MHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 40MHz | pins 2 & 3 closed | Closed | Closed |
|--------------+-------------------+------------+------------|
| 50i MHz | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 50MHz | pins 2 & 3 closed | Closed | Open |
|--------------+-------------------+------------+------------|
| 66i MHz | pins 1 & 2 closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP5 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+