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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420/1425/1433V
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 20/25/33/50(internal)/50/66(internal)MHz
Speed
Chip Set VLSI
Max. Onboard 32MB
DRAM
Cache None
BIOS Award
Dimensions 230mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | J1 | Turbo switch | J5 |
|-------------------+----------+------------------+----------|
| Power LED & | J2 | 5v DC ground | J6 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Turbo LED | J3 | External battery | CN2 |
|-------------------+----------+------------------+----------|
| Reset switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Keyboard type select BTC | JP1 | Closed |
| | keyboard | | |
|---+----------------------------------+--------+------------|
| | Normal operation | JP1 | Open |
|---+----------------------------------+--------+------------|
| » | AT bus clock mode select | JP2 | pins 1 & 2 |
| | asynchronous | | closed |
|---+----------------------------------+--------+------------|
| | AT bus clock mode select | JP2 | pins 2 & 3 |
| | synchronous | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP3 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP3 | Closed |
|---+----------------------------------+--------+------------|
| » | 8042 turbo control pin select | JP4 | pins 1 & 2 |
| | pin 30 closed | | closed |
|---+----------------------------------+--------+------------|
| | 8042 turbo control pin select | JP4 | pins 2 & 3 |
| | pin 23 closed | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP5 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board keyboard fuse enabled | JP9 | Open |
|---+----------------------------------+--------+------------|
| | On board keyboard fuse disabled | JP9 | 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) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (PQFP CPU INSTALLED) |
|------------------------------------------------------------|
| Type | JP7 | JP8 | JP14 | JP15 |
|----------------------------+-------+-------+-------+-------|
| 80486SX (PQFP) & upgrade | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
| to DX/DX2 | | | | |
|----------------------------+-------+-------+-------+-------|
| 80486SX (PQFP) & upgrade | open | 1 & 2 | 2 & 3 | 2 & 3 |
| to Overdrive | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (PGA ONLY CPU INSTALLED) |
|------------------------------------------------------------|
| Type | JP7 | JP8 | JP14 | JP15 |
|--------------+-------------+-----------+-----------+-------|
| 80487SX | pins 1 & 2 | pins 2 & | pins 2 & | Open |
| | closed | 3 closed | 3 closed | |
|--------------+-------------+-----------+-----------+-------|
| 80486DX/DX2 | pins 1 & 2 | pins 2 & | pins 1 & | Open |
| | closed | 3 closed | 2 closed | |
|------------------------------------------------------------|
| Note: The PQFP CPU is optional and may not be present. If |
| there is no PQFP, use the above settings. |
+------------------------------------------------------------+