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# POLOTEC, INC.
MBA-503B
Processor 80386DX/CX486DLC
Processor Speed 25/33/40MHz
Chip Set Micronics
Max. Onboard DRAM 32MB
SRAM Cache None
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options 80387/3167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Turbo LED | D4 | Reset switch | J5 |
|------------------+----------+-------------------+----------|
| External battery | J3 | Speaker | J6 |
|------------------+----------+-------------------+----------|
| Parallel port | J4 | Power LED & | J7 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | RTC type select 146818 | JP1 | pins 2 & 3 |
| | | | closed |
| | | JP3 | |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | RTC type select DS1287 | JP1 | pins 1 & 2 |
| | | | closed |
| | | JP3 | |
| | | | open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP2 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP2 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP4 | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP4 | open |
|---+--------------------------------+--------+--------------|
| | NPU select 80387 | JP5 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | NPU select 3167 or none | JP5 | pins 2 & 3 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+