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# UNIDENTIFIED
LX400A/G
Processor 80486SX/80487SX/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal) MHz
Speed
Chip Set SiS
Max. Onboard 32MB
DRAM
Cache 64/128/256
BIOS AMI
Dimensions 230mm x 218mm
I/O Options 32-bit VESA local bus slots (2), PS/2 mouse
port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Flash LED | FLASH | Power LED & keylock | J7 |
| connector | | | |
|---------------+----------+----------------------+----------|
| Turbo LED | J3 | PS/2 mouse connector | J11 |
|---------------+----------+----------------------+----------|
| Turbo switch | J4 | Standby output | J28 |
| | | connector | |
|---------------+----------+----------------------+----------|
| Speaker | J5 | 32-bit VESA Local | S1 |
| | | bus slot | |
|---------------+----------+----------------------+----------|
| Reset switch | J6 | 32-bit VESA Local | S2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | Factory configured do not alter | JP1 | Open |
|---+---------------------------------+--------+-------------|
| » | Monitor type select color | JP2 | Closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP2 | Open |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP10 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP11 | N/A |
|---+---------------------------------+--------+-------------|
| | PS/2 mouse interrupt | JP12 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | PS/2 mouse set at AT Bus IRQ12 | JP12 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP13 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP14 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP21 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP22 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP23 | N/A |
|---+---------------------------------+--------+-------------|
| » | Power saving mode switch off | STDBY | Open |
|---+---------------------------------+--------+-------------|
| | Power saving mode switch on | STDBY | 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) 4MB x 9 | (4) 4MB x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1MB x9 | (4) 4MB x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4MB x 9 | (4) 4MB x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE 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 are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64 KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128 KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256 KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP6 | JP7 | JP8 |
|-----------+--------+-------------------+-------------------|
| 80486SX | Open | Open | pins 2 & 3 closed |
|-----------+--------+-------------------+-------------------|
| 80487SX | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | S0 | S1 | S2 |
|-----------------+--------------+-------------+-------------|
| 25 MHz | Closed | Open | Open |
|-----------------+--------------+-------------+-------------|
| 33 MHz | Closed | Closed | Closed |
|-----------------+--------------+-------------+-------------|
| 40 MHz | Closed | Closed | Closed |
|-----------------+--------------+-------------+-------------|
| 50 MHz | Open | Open | Closed |
|-----------------+--------------+-------------+-------------|
| 50iMHz | Closed | Open | Open |
|-----------------+--------------+-------------+-------------|
| 60iMHz | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note:The location on the system board of the above jumpers |
| is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | Wait states | JP24, JP26 | JP25, JP27 |
|-----------+---------------+------------------+-------------|
| < 33MHz | 0 wait states | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-----------+---------------+------------------+-------------|
| > 33MHz | 1 wait state | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note:Some of the SR jumpers may be hard-wired by the |
| manufacturer, thus some of the cache options may not be |
| available. |
+------------------------------------------------------------+