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# UNIDENTIFIED
452S
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J1 | Reset switch | J5 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J2 | External battery | JP13 |
|---------------+----------+----------------------+----------|
| Turbo LED | J3 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
|---------------+----------+----------------------+----------|
| Turbo switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| » | Monitor type select monochrome | JP12 | Open |
|---+----------------------------------+---------+-----------|
| | Monitor type select color | JP12 | Closed |
|---+----------------------------------+---------+-----------|
| » | CMOS memory normal operation | JP14 | Open |
|---+----------------------------------+---------+-----------|
| | CMOS memory clear | JP14 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 or (1) 32K |
| | | | x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP10 |
|-------------------+-------------------+--------------------|
| 64KB | Open | Open |
|-------------------+-------------------+--------------------|
| 128KB | Closed | pins 1 & 2 closed |
|-------------------+-------------------+--------------------|
| 256KB | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 |
|-----------------+--------+----------------+----------------|
| 80486SX | Open | pins 2 & 3 | Open |
| | | closed | |
|-----------------+--------+----------------+----------------|
| 80487SX | Closed | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| 80486DX/DX2 | Closed | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-----------------+--------+----------------+----------------|
| Pentium | Closed | pins 1 & 2 | pins 2 & 3 |
| Overdrive | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Type | JS1 | JS2 | JS3 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 40MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP16 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP15 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+