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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486VF
Processor 80486SX/80487SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set SiS
Max. 128MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS AWARD
Dimensions 230mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC feature
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Power LED & | J7 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | J3 | External power | JP33 |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | LED connector | JP34 |
|------------------+----------+-------------------+----------|
| Speaker | J5 | 32-bit VESA Local | SL1-SL3 |
| | | bus slots | |
|------------------+----------+-------------------+----------|
| Reset switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | Turbo mode enabled | J3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Turbo mode disabled | J3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 80486DX2, DX or OverDrive | JP8 | pins 1 & 2 |
| | installed | | closed |
|---+----------------------------------+--------+------------|
| | 80486SX installed | JP8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Non AMD CPU | JP11 | Closed |
|---+----------------------------------+--------+------------|
| | AMD CPU | JP11 | Open |
|---+----------------------------------+--------+------------|
| » | For Cyrix CPU installed | JP18 | Open |
|---+----------------------------------+--------+------------|
| | For normal operation | JP18 | Closed |
|---+----------------------------------+--------+------------|
| » | Normal CPU ADS# operation | JP20 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Delay CPU ADS# clock operation | JP20 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Cyrix CPU in use | *JP21 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Other CPU in use | *JP21 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | DX4CPU x 2 | JP24 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | DX4CPU x 3 | JP24 | Open |
|---+----------------------------------+--------+------------|
| » | Cyrix CPU | JP24 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory normal operation | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Green PC mode disabled | JP26 | Open |
|---+----------------------------------+--------+------------|
| | Green PC mode enabled | JP26 | Closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select CGA | JP17 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select other | JP17 | Open |
|------------------------------------------------------------|
| Note: *This option applies to Revision 6 only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 65MB | (4) 256K x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 68MB | (4) 1M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 80MB | (4) 4M x 9 | (4) 16M x 9 |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M 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) 16K x 8/(1) 32K x |
| | | | 8 |
|-------+--------------+-------------+-----------------------|
| 256KB | (4) 64K x 8 | NONE | (1) 16K x 8/(1) 32K x |
| | | | 8 |
|-------+--------------+-------------+-----------------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP3 | JP4 |
|---------+----------+---------+---------+-------------------|
| 64KB | Open | Open | Open | N/A |
|---------+----------+---------+---------+-------------------|
| 128KB | Closed | Open | Open | pins 1 & 2 closed |
|---------+----------+---------+---------+-------------------|
| 256KB | Closed | Closed | Open | pins 2 & 3 closed |
|---------+----------+---------+---------+-------------------|
| 256KB | Closed | Closed | Open | pins 1 & 2 closed |
|---------+----------+---------+---------+-------------------|
| 512KB | Closed | Closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL-BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP29 |
|-------------------------------+----------------------------|
| DX-50/40 MHz | Closed |
|-------------------------------+----------------------------|
| Other Speed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| CPU Type | JP36 | JP37 |
|---------------------+-------------------+------------------|
| 5 Voltage CPU | Closed | Closed |
|---------------------+-------------------+------------------|
| 3.3 Voltage DX4 CPU | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DELAY LOCAL BUS CLOCK |
|------------------------------------------------------------|
| | J2 (VESA1) | J8(VESA2) | J9(VESA3) |
|---------------------+------------+------------+------------|
| » | For normal | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | operation | closed | closed | closed |
|---+-----------------+------------+------------+------------|
| | DX-33, DX-40, | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | DX-50, DX2-66, | closed | closed | closed |
| | DX4-75, | | | |
| | DX4-100* | | | |
|------------------------------------------------------------|
| Note: *For some VL-Bus interface cards that need more |
| address setup time in above listed speeds. |
+------------------------------------------------------------+