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# BCM ADVANCED RESEARCH, INC.
LX400A/P VLB
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)
Chip Set SIS
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus slot (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | J3 | Power LED & keylock | J7 |
|--------------+----------+-----------------------+----------|
| Turbo switch | J4 | 32-bit VESA local bus | S1 |
| | | slot | |
|--------------+----------+-----------------------+----------|
| Speaker | J5 | 32-bit VESA local bus | S2 |
| | | slot | |
|--------------+----------+-----------------------+----------|
| Reset switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 32-BIT VESA LOCAL BUS SLOT CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | JP24 | JP25 | JP26 | JP27 |
|-----------+---------------+----------+----------+----------|
| <=33MHz | pins 1 & 2 | pins 1 & | pins 1 & | pins 1 & |
| | closed | 2 closed | 2 closed | 2 closed |
|-----------+---------------+----------+----------+----------|
| > 33MHz | pins 2 & 3 | pins 2 & | pins 2 & | pins 2 & |
| | closed | 3 closed | 3 closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | JP1 | open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | JP2 | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | JP2 | open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | Power good signal detect | JP14 | pins 1 & 2 |
| | from power supply | | closed |
|---+---------------------------+---------------+------------|
| | Power good signal detect | JP14 | pins 2 & 3 |
| | from board | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | 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 | (2) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | SR1 | SR2 | SR3 | SR4 | SR5 |
|-------+------------+----------+----------+--------+--------|
| 64KB | pins 2 & 3 | pins 2 & | pins 1 & | pins 1 | pins 1 |
| | | 3 | 2 | & 2 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 128KB | pins 1 & 2 | pins 1 & | pins 2 & | pins 2 | pins 1 |
| | | 2 | 3 | & 3 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 256KB | pins 2 & 3 | pins 2 & | pins 2 & | pins 2 | pins 2 |
| | | 3 | 3 | & 3 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP10 | JP11 | JP12 | JP13 |
|--------------------+---------+---------+---------+---------|
| 20MHz | pins 2 | pins 2 | pins 2 | pins 2 |
| | & 3 | & 3 | & 3 | & 3 |
|--------------------+---------+---------+---------+---------|
| 25MHz/50(internal) | pins 2 | pins 2 | pins 1 | pins 1 |
| | & 3 | & 3 | & 2 | & 2 |
|--------------------+---------+---------+---------+---------|
| 33MHz/66(internal) | pins 1 | pins 2 | pins 1 | pins 1 |
| | & 2 | & 3 | & 2 | & 2 |
|--------------------+---------+---------+---------+---------|
| 50MHz | pins 1 | pins 1 | pins 1 | pins 1 |
| | & 2 | & 2 | & 2 | & 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU type | JP6 | JP7 | JP8 |
|-------------+--------+------------------+------------------|
| 80486SX | open | open | pins 2 & 3 |
| | | | closed |
|-------------+--------+------------------+------------------|
| 80487SX | closed | pins 2 & 3 | pins 1 & 2 |
| | | closed | closed |
|-------------+--------+------------------+------------------|
| 80486DX/DX2 | closed | pins 1 & 2 | pins 1 & 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 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+