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# SCI SYSTEMS, INC.
SCI 486SX/DX SYSTEM BOARD
Processor 80486SX/80486DX
Processor 25/33MHz
Speed
Chip Set OPTI
Max. Onboard 64MB
DRAM
Cache 64/256KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, parallel
port, PS/2 mouse port, serial ports (2), VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| PS/2 mouse port | J1 | IDE interface | J23 |
| | | LED | |
|----------------------+----------+---------------+----------|
| IDE interface | J5 | Reset switch | J24 |
|----------------------+----------+---------------+----------|
| Floppy drive | J6 | Speaker | J25 |
| interface | | | |
|----------------------+----------+---------------+----------|
| Parallel port | J8 | Power LED & | J26 |
| | | keylock | |
|----------------------+----------+---------------+----------|
| Serial port 2 | J9 | VGA port | J27 |
|----------------------+----------+---------------+----------|
| Serial port 1 | J10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Monitor type select color | W1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | W1 | pins 2 & 3 |
| | monochrome | | closed |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | W2 | pins 1 & 2 |
| | operation | | closed |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | W2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | SYSCLK enabled | W3 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | SYSCLK/2 enabled | W3 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | On board VGA enabled | W10 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | On board VGA disabled | W10 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Video horizontal scan | SW1/5 | On |
| | rate select 31.5 kHz | | |
|---+---------------------------+---------------+------------|
| | Video horizontal scan | SW1/5 | Off |
| | rate select 40kHz | | |
|---+---------------------------+---------------+------------|
| » | Video memory select 512KB | SW1/6 | On |
|---+---------------------------+---------------+------------|
| | Video memory select 1MB | SW1/6 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 256K x | (1) 1M x 36 | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 256K x | (1) 256K x | (1) 1M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 256K x | (1) 1M x 36 | (1) 1M x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 256K x | (1) 256K x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 256K x | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | 36 | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 4M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 1M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 1M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 16K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W4 | W5 | W9 | W11 |
|-------+-------------+------------+------------+------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | W6 | W7 | W8 |
|-------+-----------------+-----------------+----------------|
| 486SX | pins 2 & 3 | pins 2 & 3 | N/A |
| | closed | closed | |
|-------+-----------------+-----------------+----------------|
| 487SX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 486DX | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO CONFIGURATION (800 X 600) |
|------------------------------------------------------------|
| Refresh rate | SW1/1 | SW1/2 |
|-------------------------+-----------------+----------------|
| » | 60Hz | Off | On |
|------+------------------+-----------------+----------------|
| | 56Hz | Off | Off |
|------+------------------+-----------------+----------------|
| | 56Hz | On | On |
|------+------------------+-----------------+----------------|
| | 72Hz | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO CONFIGURATION (1024 X 768) |
|------------------------------------------------------------|
| Refresh rate | SW1/3 | SW1/4 |
|-------------------------+-----------------+----------------|
| » | Interlaced | Off | Off |
|----+--------------------+-----------------+----------------|
| | 60Hz | Off | On |
|----+--------------------+-----------------+----------------|
| | 70Hz | On | Off |
|----+--------------------+-----------------+----------------|
| | 72Hz | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+----------------------+---------------------|
| 512KB | (4) 256K x 4 | NONE |
|---------------+----------------------+---------------------|
| 1MB | (4) 256K x 4 | (4) 256K x 4 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
+------------------------------------------------------------+