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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420C-CH/1433C-CH
Processor 80486SX/80486DX
Processor Speed 20/33MHz
Chip Set C & T
Max. Onboard DRAM 32MB
Cache 64/128KB
BIOS AMI
Dimensions 327mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | J1 | Turbo LED | J4 |
|-------------------+----------+------------------+----------|
| Power LED & | J2 | Turbo switch | J5 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Reset switch | J3 | External battery | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | W4 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | W4 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | W5 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | W5 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 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 (U21) | TAG (U22) |
|---------+---------------+----------+-----------+-----------|
| 64KB | (4) 8K x 8 | (4) 8K x | (1) 8K x | (1) 8K x |
| | | 8 | 8 | 8 |
|---------+---------------+----------+-----------+-----------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x | NONE |
| | | | 8 | |
|------------------------------------------------------------|
| Note:Bank 0 = U8, U10, U12, & U14. With 16MB or more of |
| DRAM, 128KB of cache must be installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W1 |
|----------------------------+-------------------------------|
| 64KB | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 128KB | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | W2 | W3 |
|--------------------+-------------------+-------------------|
| 80486SX-20 | Open | Closed |
|--------------------+-------------------+-------------------|
| 80487SX-20 | Closed | Open |
|--------------------+-------------------+-------------------|
| 80486DX-33 | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| POWER GOOD CONFIGURATION |
|------------------------------------------------------------|
| Type | W6 | W7 |
|--------------------+-------------------+-------------------|
| Signal detect from | pins 1 & 2 closed | pins 1 & 2 closed |
| power supply | | |
|--------------------+-------------------+-------------------|
| Signal detect from | pins 2 & 3 closed | pins 2 & 3 closed |
| board | | |
+------------------------------------------------------------+