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# I-BUS
LB486SLC
Processor CX486SLC
Processor 33MHz
Speed
Chip Set OPTI
Max. Onboard 16MB
DRAM
Cache 128KB
BIOS Unidentified
Dimensions 300mm x 89mm
I/O Options Floppy drive interface, IDE interface, parallel
port, PS/2 mouse port, serial ports (2), VGA port
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J3 | Parallel port | J15 |
|---------------------+----------+----------------+----------|
| Reset switch | J4 | Serial port 1 | J16 |
|---------------------+----------+----------------+----------|
| PS/2 mouse port | J6 | Serial port 2 | J17 |
|---------------------+----------+----------------+----------|
| Auxiliary keyboard | J7 | IDE interface | J18 |
| connector | | LED | |
|---------------------+----------+----------------+----------|
| Floppy drive | J13 | VGA port | J22 |
| interface | | | |
|---------------------+----------+----------------+----------|
| IDE interface | J14 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J1 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J2 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | J8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J8 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE IRQ14 enabled | J12 | Closed |
|---+----------------------------------+--------+------------|
| | IDE IRQ14 disabled | J12 | Open |
|---+----------------------------------+--------+------------|
| | VGA IRQ9 enabled | J23 | Closed |
|---+----------------------------------+--------+------------|
| | VGA IRQ9 disabled | J23 | Open |
|---+----------------------------------+--------+------------|
| | On board video disabled | J24 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board video enabled | J24 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Password enabled | J25 | Closed |
|---+----------------------------------+--------+------------|
| | Password disabled | J25 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (2) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 9 | (2) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (2) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (2) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 128KB cache is factory installed and is not |
| configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ | J21 |
|----------------------------+-------------------------------|
| IRQ3 | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| IRQ4 | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| IRQ5 | pins 7 & 8 closed |
|----------------------------+-------------------------------|
| IRQ7 | pins 9 & 10 closed |
|----------------------------+-------------------------------|
| IRQ12 | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ | J20 |
|----------------------------+-------------------------------|
| IRQ3 | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| IRQ4 | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| IRQ5 | pins 7 & 8 closed |
|----------------------------+-------------------------------|
| IRQ7 | pins 9 & 10 closed |
|----------------------------+-------------------------------|
| IRQ12 | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ | J19 |
|----------------------------+-------------------------------|
| IRQ3 | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| IRQ4 | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| IRQ5 | pins 7 & 8 closed |
|----------------------------+-------------------------------|
| IRQ7 | pins 9 & 10 closed |
|----------------------------+-------------------------------|
| IRQ12 | pins 1 & 2 closed |
+------------------------------------------------------------+