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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB 1433/1450AEA-P
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 64/128/256KB
BIOS AMI
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 | JP8 |
|-------------------+----------+------------------+----------|
| Reset switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Tag RAM size select 7- bit | JP6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Tag RAM size select 8- bit | JP6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Battery type select RTC 146818 | JP11 | Open |
|---+----------------------------------+--------+------------|
| | Battery type select Dallas 1287 | JP11 | Closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP14 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP14 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 1 & 2 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M 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) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP12 | JP19 |
|-------+--------------------------------+-------------------|
| 64KB | Open | pins 1 & 2 closed |
|-------+--------------------------------+-------------------|
| 128KB | pins 1 & 2, 3 & 4 closed | pins 2 & 3 closed |
|-------+--------------------------------+-------------------|
| 256KB | pins 1 & 2, 3 & 4, 5 & 6 | pins 1 & 2 closed |
| | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP13 | JP20 |
|------------------+--------------------+--------------------|
| 80486SX | Open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX/DX2 | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| Overdrive | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP10 |
|----------------------+--------------------+----------------|
| 80486DX-50 | pins 1 & 2 closed | Closed |
|----------------------+--------------------+----------------|
| All other CPU speeds | pins 2 & 3 closed | Open |
+------------------------------------------------------------+