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# INFOMATIC POWER SYSTEMS CORPORATION
486 EISA BABY SIZE
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 128MB
Cache 64/128/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Speaker | J4 | Turbo LED | J7 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J5 | Reset switch | S9 |
|---------------------+----------+----------------+----------|
| Turbo switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | External BCLK buffering 80486DX | JP1 | pins 1 & 2 |
| | (33/50MHz) | | closed |
|---+----------------------------------+--------+------------|
| | External BCLK buffering | JP1 | pins 2 & 3 |
| | 80486SX/80487SX (20/25MHz) | | closed |
|---+----------------------------------+--------+------------|
| » | Cache bank select single | JP2 | pins 1 & 2 |
| | (128/512KB) | | closed |
|---+----------------------------------+--------+------------|
| | Cache bank select double | JP2 | pins 2 & 3 |
| | (64/256KB) | | closed |
|---+----------------------------------+--------+------------|
| » | Snooping/Flush 20MHz CPU | JP8 | Closed |
|---+----------------------------------+--------+------------|
| | Snooping/Flush > 20MHz CPU | JP8 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP9 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP9 | Open |
|---+----------------------------------+--------+------------|
| » | CPU clock mode select single | JP12 | pins 1 & 2 |
| | frequency | | closed |
|---+----------------------------------+--------+------------|
| | CPU clock mode select double | JP12 | pins 2 & 3 |
| | frequency | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+---------------------+----------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|---------------+---------------------+----------------------|
| 128KB | NONE | (4) 32K x 8 |
|---------------+---------------------+----------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
|---------------+---------------------+----------------------|
| 512KB | NONE | (4) 128K x 8 |
|------------------------------------------------------------|
| Note:In order to configure cache to 512KB, board needs to |
| be specifically ordered. The difference will be that Bank |
| 1 will be made up of 4 32-pin DIP sockets, instead of 4 |
| 28-pin DIP sockets. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG CHIP CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP5 | U55 | U56 |
|-------+--------+--------+--------+-------------+-----------|
| 64KB | Open | Open | Open | (1) 8K x 8 | N/A |
|-------+--------+--------+--------+-------------+-----------|
| 128KB | Closed | Open | Open | (1) 8K x 8 | N/A |
|-------+--------+--------+--------+-------------+-----------|
| 256KB | Closed | Closed | Open | (1) 8K x 8 | (1) 8K x |
| | | | | | 8 |
|-------+--------+--------+--------+-------------+-----------|
| 512KB | Closed | Closed | Closed | (1) 32K x 8 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE DIRTY BIT CHIP CONFIGURATION |
|------------------------------------------------------------|
| Size | JP16 | JP17 | JP18 | U72 & U54 |
|-------+--------+--------+--------+-------------------------|
| 64KB | Open | Open | Open | (2) 16K x 1 or (2) 64K |
| | | | | x 1 |
|-------+--------+--------+--------+-------------------------|
| 128KB | Closed | Open | Open | (2) 16K x 1 or (2) 64K |
| | | | | x 1 |
|-------+--------+--------+--------+-------------------------|
| 256KB | Closed | Closed | Open | (2) 16K x 1 or (2) 64K |
| | | | | x 1 |
|-------+--------+--------+--------+-------------------------|
| 512KB | Closed | Closed | Closed | (2) 64K x 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP10 | JP11 |
|-----------+---------------------------+--------------------|
| 80486SX | pins 1 & 2 & 3 & 4 closed | pins 2 & 3 closed |
|-----------+---------------------------+--------------------|
| 80487SX | pins 1 & 2 & 3 & 4 closed | pins 1 & 2 closed |
|-----------+---------------------------+--------------------|
| 80486DX | pins 2 & 3 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EBC SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP6 | JP7 |
|-------------------+--------------------+-------------------|
| 20MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 25MHz | Open | Open |
|-------------------+--------------------+-------------------|
| 33MHz | Open | Closed |
|-------------------+--------------------+-------------------|
| 40MHz | Closed | Open |
|-------------------+--------------------+-------------------|
| 50MHz | Closed | Closed |
+------------------------------------------------------------+