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# GIGA-BYTE TECHNOLOGY CO., INC.
GA-486VS REV.8C
Processor CX486M6/AM486/80486SX/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 connector
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Power LED & | J7 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | J3 | Green PC | JP33 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | Green PC LED | JP34 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Speaker | J5 | 32-bit VESA local | S1 - S3 |
| | | bus slots | |
|------------------+----------+-------------------+----------|
| Reset switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CPU type select all CPU’s | JP11 | Closed |
|---+----------------------------------+--------+------------|
| | CPU type select AMD CPU only | JP11 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select CGA | JP17 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select all others | JP17 | Open |
|---+----------------------------------+--------+------------|
| » | CPU type select all CPU types | JP21 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU type select Cyrix, P24D, AMD | JP21 | pins 1 & 2 |
| | enhanced CPU only | | closed |
|---+----------------------------------+--------+------------|
| » | Green PC normal operation | JP26 | Open |
|---+----------------------------------+--------+------------|
| | Green PC green mode | JP26 | Closed |
|---+----------------------------------+--------+------------|
| » | Cache type select write through | JP30 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Cache type select write back | JP30 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | (1) 512K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 4M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 512K x | (1) 512K x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 16M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 65MB | (1) 256K x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 or (1) |
| | | | 32K x 8 |
|-------+--------------+-------------+-----------------------|
| 256KB | (4) 64K x 8 | NONE | (1) 16K x 8 or (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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP24 |
|----------------------------+-------------------------------|
| CX486M6 | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| AM486SL | pins 2 & 5 closed |
|----------------------------+-------------------------------|
| P24D | pins 2 & 5 closed |
|----------------------------+-------------------------------|
| AM486DX4 2x | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| AM486DX4 3x | pins 3 & 4 open |
|----------------------------+-------------------------------|
| 80486DX4 2x | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 80486DX4 3x | pins 3 & 4 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 | JP18 |
|--------------------+--------------------+------------------|
| CX486M6 | N/A | Open |
|--------------------+--------------------+------------------|
| 80486SX | pins 2 & 3 closed | Closed |
|--------------------+--------------------+------------------|
| 80486DX | pins 1 & 2 closed | Closed |
|--------------------+--------------------+------------------|
| 80486DX2 | pins 1 & 2 closed | Closed |
|--------------------+--------------------+------------------|
| 80486DX4 | pins 1 & 2 closed | Closed |
|--------------------+--------------------+------------------|
| Pentium Overdrive | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 | JP29 |
|-------------------+----------+---------+---------+---------|
| 25MHz | Open | Open | Closed | Open |
|-------------------+----------+---------+---------+---------|
| 33MHz | Closed | Closed | Closed | Open |
|-------------------+----------+---------+---------+---------|
| 40MHz | Open | Closed | Closed | Closed |
|-------------------+----------+---------+---------+---------|
| 50iMHz | Open | Open | Closed | Open |
|-------------------+----------+---------+---------+---------|
| 50MHz | Closed | Open | Open | Closed |
|-------------------+----------+---------+---------+---------|
| 66iMHz | Closed | Closed | Closed | Open |
|-------------------+----------+---------+---------+---------|
| 75i (40 x 2) MHz | Open | Closed | Closed | Closed |
|-------------------+----------+---------+---------+---------|
| 75i (25 x 3) MHz | Open | Open | Closed | Open |
|-------------------+----------+---------+---------+---------|
| 100i (50 x 2) MHz | Closed | Open | Open | Closed |
|-------------------+----------+---------+---------+---------|
| 100i (33 x 3) MHz | Closed | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Function | JP36 | JP37 |
|--------------------+-------------------+-------------------|
| 3.3 v | Open | Open |
|--------------------+-------------------+-------------------|
| 5 v | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOLTAGE DELAY CONFIGURATION |
|------------------------------------------------------------|
| Function | J2 | J8 | J9 | JP20 |
|-----------------------+---------+--------+--------+--------|
| Normal card installed | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
|-----------------------+---------+--------+--------+--------|
| Card installed needs | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
| address time | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in closed position. |
| Systems utilizing cards that need more address time are: |
| DX4-100, DX4-75, DX2-66, DX-50, DX-40, DX-33. |
+------------------------------------------------------------+