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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486VC
Processor 80486SX/80487SX/CX486S/CX486S2/80486DX/80486DX2/Pentium
Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set UMC
Max. 64MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS AMI
Dimensions 230mm x 218mm
I/O 32-bit VESA local bus slots (3)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | J1 | Turbo LED | JP6 |
|-------------------+----------+------------------+----------|
| Turbo switch | J2 | External power | JP15 |
| | | control port | |
|-------------------+----------+------------------+----------|
| Speaker | J3 | 32-bit VESA | S1 |
| | | Local bus slot | |
|-------------------+----------+------------------+----------|
| Power LED & | J4 | 32-bit VESA | S2 |
| keylock | | Local bus slot | |
|-------------------+----------+------------------+----------|
| Reset switch | J5 | 32-bit VESA | S3 |
| | | Local bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------+--------+----------------|
| ยป | CMOS memory normal operation | JP13 | pins 1 & 2 |
| | | | closed |
|---+------------------------------+--------+----------------|
| | CMOS memory clear | JP13 | pins 2 & 3 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|-------+--------------+-------------+-----------------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 | JP3 | JP4 | JP5 |
|---------+-------------------+----------+---------+---------|
| 64KB | pins 1 & 2 closed | Open | Open | Open |
|---------+-------------------+----------+---------+---------|
| 128KB | pins 2 & 3 closed | Open | Open | Closed |
|---------+-------------------+----------+---------+---------|
| 256KB | pins 1 & 2 closed | Open | Closed | Closed |
|---------+-------------------+----------+---------+---------|
| 512KB | pins 2 & 3 closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP18 | JP19 |
|--------------------+--------------------+------------------|
| 80486SX | pins 2 & 3 closed | Open |
|--------------------+--------------------+------------------|
| 80487SX | pins 1 & 2 closed | Open |
|--------------------+--------------------+------------------|
| CX486S | N/A | Open |
|--------------------+--------------------+------------------|
| CX486S2 | N/A | Closed |
|--------------------+--------------------+------------------|
| 80486DX | pins 1 & 2 closed | Open |
|--------------------+--------------------+------------------|
| 80486DX2 | pins 1 & 2 closed | Open |
|--------------------+--------------------+------------------|
| Pentium Overdrive | pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP10 | JP11 | JP12 | JP14 | JP17 |
|-------+----------+----------+----------+----------+--------|
| 20MHz | pins 1 & | pins 1 & | pins 1 & | pins 1 & | Open |
| | 2 closed | 2 closed | 2 closed | 2 closed | |
|-------+----------+----------+----------+----------+--------|
| 25MHz | pins 2 & | pins 1 & | pins 1 & | pins 1 & | Open |
| | 3 closed | 2 closed | 2 closed | 2 closed | |
|-------+----------+----------+----------+----------+--------|
| 33MHz | pins 2 & | pins 2 & | pins 2 & | pins 1 & | Open |
| | 3 closed | 3 closed | 3 closed | 2 closed | |
|-------+----------+----------+----------+----------+--------|
| 40MHz | pins 2 & | pins 2 & | pins 1 & | pins 2 & | Closed |
| | 3 closed | 3 closed | 2 closed | 3 closed | |
|-------+----------+----------+----------+----------+--------|
| 50i | pins 2 & | pins 1 & | pins 1 & | pins 1 & | Open |
| MHz | 3 closed | 2 closed | 2 closed | 2 closed | |
|-------+----------+----------+----------+----------+--------|
| 50MHz | pins 1 & | pins 1 & | pins 2 & | pins 2 & | Closed |
| | 2 closed | 2 closed | 3 closed | 3 closed | |
|-------+----------+----------+----------+----------+--------|
| 66i | pins 2 & | pins 2 & | pins 2 & | pins 1 & | Open |
| MHz | 3 closed | 3 closed | 3 closed | 2 closed | |
+------------------------------------------------------------+