TEXT View Source
# JETPRO INFOTECH COMPANY, LTD.
MB-3A(MB-333SXA)
Processor 80386SX/CX486SLC
Processor Speed 16/20/25/33MHz
Chip Set ALI
Max. Onboard DRAM 16MB
SRAM Cache None
BIOS AMI/MR
Dimensions 178mm x 218mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| External battery | J4 | Turbo LED & | J8 pins 1 |
| | | Turbo switch | & 2 |
|------------------+----------+------------------+-----------|
| Reset switch | J6 | Power LED & | J8 pins 4 |
| | | keylock | & 5 |
|------------------+----------+------------------+-----------|
| Speaker | J7 | Power LED & | J9 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | ADS delay enabled | J5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | ADS delay disabled | J5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | NPU mode select synchronous with | JP2 | pins 1 & 2 |
| | CPU | | closed |
|---+----------------------------------+--------+------------|
| | NPU mode select asynchronous | JP2 | pins 2 & 3 |
| | with CPU | | closed |
|---+----------------------------------+--------+------------|
| » | RTC type select 146818 | JP3 | open |
|---+----------------------------------+--------+------------|
| | RTC type select 1287 | JP3 | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Parity check disabled | JP6 | open |
|---+----------------------------------+--------+------------|
| | Parity check enabled | JP6 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | JP1 | JP5 |
|------------------+--------------------+--------------------|
| 16MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 20MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 25MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (2) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 9 | (2) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (2) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (2) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 |
+------------------------------------------------------------+