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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486IS
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Overdrive
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set Intel
Max. Onboard 128MB
DRAM
Cache 64/128/256/512KB
BIOS AMI
Dimensions 230mm x 218mm
I/O Options 32-bit PCI local bus slots (4)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Power down mode | JP27 |
| keylock | | LED | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | 32-bit PCI Local | S1 |
| | | bus slot | |
|-------------------+----------+------------------+----------|
| Turbo LED | J3 | 32-bit PCI Local | S2 |
| | | bus slot | |
|-------------------+----------+------------------+----------|
| External power | J5 | 32-bit PCI Local | S3 |
| control port | | bus slot | |
|-------------------+----------+------------------+----------|
| Reset switch | JP9 | 32-bit PCI Local | S4 |
| | | bus slot | |
|-------------------+----------+------------------+----------|
| Turbo switch | JP21 | | |
+------------------------------------------------------------+
c
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+----------+------------|
| ยป | CMOS memory normal operation | J4 | Open |
|---+--------------------------------+----------+------------|
| | CMOS memory clear | J4 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 3 |
|------------------+--------------------+--------------------|
| 2MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 4MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 6MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 16M x 36 | NONE |
|------------------+--------------------+--------------------|
| 34MB | (2) 16M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 16M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 16M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 16M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 16M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 32M x 36 | NONE |
|------------------+--------------------+--------------------|
| 128MB | (2) 32M x 36 | (2) 32M x 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 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J6 | J7 | J9 | JP11 | JP12 |
|---------+----------+---------+---------+---------+---------|
| 64KB | Open | Open | Open | Closed | Closed |
|---------+----------+---------+---------+---------+---------|
| 128KB | Open | Closed | Open | Closed | Open |
|---------+----------+---------+---------+---------+---------|
| 256KB | Closed | Closed | Open | Open | Closed |
|---------+----------+---------+---------+---------+---------|
| 512KB | Closed | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP10 |
|------------------------------+-----------------------------|
| 80486SX | pins 2 & 3 closed |
|------------------------------+-----------------------------|
| 80487SX | pins 2 & 3 closed |
|------------------------------+-----------------------------|
| 80486DX | pins 1 & 2 closed |
|------------------------------+-----------------------------|
| ODP486SX | pins 1 & 2 closed |
|------------------------------+-----------------------------|
| 80486DX2 | pins 1 & 2 closed |
|------------------------------+-----------------------------|
| Pentium Overdrive | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP7 | JP18 |
|-------------------+--------------------+-------------------|
| 25MHz | pins 2 & 3 closed | Closed |
|-------------------+--------------------+-------------------|
| 33MHz | pins 1 & 2 closed | Open |
|-------------------+--------------------+-------------------|
| 50iMHz | pins 2 & 3 closed | Closed |
|-------------------+--------------------+-------------------|
| 66iMHz | pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ INTERRUPT CONFIGURATION |
|------------------------------------------------------------|
| IRQ | JP20 | JP21 | JP22 | JP23 |
|---------+------------+------------+------------+-----------|
| 9 | Closed | Open | Open | Open |
|---------+------------+------------+------------+-----------|
| 10 | Open | Closed | Open | Open |
|---------+------------+------------+------------+-----------|
| 11 | Open | Open | Closed | Open |
|---------+------------+------------+------------+-----------|
| 14 | Open | Open | Open | Closed |
+------------------------------------------------------------+