TEXT View Source
# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486VM
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set UMC
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J2 | Speaker | J8 |
|------------------+----------+-------------------+----------|
| Turbo LED | J5 | Power LED & | J9 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | J6 | 32-bit VESA card | S1 - S3 |
| | | (3) | |
|------------------+----------+-------------------+----------|
| Turbo switch | J7 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 color | J11 | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | J11 | open |
|---+--------------------------------+--------+--------------|
| » | VESA bus wait states select 0 | JP5 | open |
|---+--------------------------------+--------+--------------|
| | VESA bus wait state select 1 | JP5 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | OSC | JP2 | JP6 | W5 | W6 |
|-------------+---------+---------+--------+--------+--------|
| 80486SX-20 | 20MHz | pins 1 | open | open | pins 2 |
| | | & 2 | | | & 3 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486SX-20 | 40MHz | pins 1 | open | closed | pins 2 |
| | | & 2 | | | & 3 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486SX-25 | 25MHz | pins 1 | open | open | pins 2 |
| | | & 2 | | | & 3 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80487SX-25 | 25MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX-25 | 25MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX-33 | 33.3MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX-40 | 40MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX-50 | 50MHz | pins 2 | closed | open | pins 1 |
| | | & 3 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX2-50 | 25MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | closed |
|-------------+---------+---------+--------+--------+--------|
| 80486DX2-66 | 33.3MHz | pins 1 | open | open | pins 1 |
| | | & 2 | | | & 2 |
| | | closed | | | 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 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W1 | W2 | W3 | W4 |
|-------+--------+--------+-----------------+----------------|
| 64KB | open | open | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 128KB | closed | open | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 256KB | closed | closed | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+