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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420PA-CH/1433PA-CH
KT TECHNOLOGY PTE LTD.
KT433OP3C-WB/BI
Processor 80486SX/80486DX
Processor Speed 20/33MHz
Chip Set OPTI
Max. Onboard DRAM 64MB
Cache 64/256KB
BIOS AMI
Dimensions 327mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J11 | Turbo LED | JP11 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J20 | Reset switch | SW1 |
|---------------------+----------+----------------+----------|
| Speaker | J21 | Turbo switch | SW2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------+--------+----------------|
| ยป | CMOS memory normal operation | JP1 | pins 2 & 3 |
| | | | closed |
|---+------------------------------+--------+----------------|
| | CMOS memory clear | JP1 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 1MB | NONE | NONE | (1) 256K x | NONE |
| | | | 36 | |
|-------+-------------+------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 2MB | NONE | NONE | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 6MB | (4) 256K x | (1) 256K x | (1) 1M x | NONE |
| | 9 | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 9MB | (4) 256K x | (4) 1M x 9 | (1) 1M x | NONE |
| | 9 | | 36 | |
|-------+-------------+------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (1) 1M x | (1) 1M x |
| | 9 | 9 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (1) 1M x | NONE |
| | | | 36 | |
|-------+-------------+------------+------------+------------|
| 13MB | (4) 256K x | (4) 1M x 9 | (1) 1M x | (1) 1M x |
| | 9 | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|-------+-------------+------------+------------+------------|
| 28MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | (1) 256K x |
| | | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|-------+-------------+------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 52MB | (4) 1M x 9 | (4) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------------------------------------------------------------|
| Note:36-bit SIMM banks 2 & 3 are not installed on some |
| board revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG | Dirty Bit |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 64K x |
| | | | at U34 | 1 at U46 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | (1) 64K x |
| | | 8 | 8 at U34 | 1 at U46 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP12 |
|-----------+----------+------------+------------+-----------|
| 64KB | Open | Open | Open | Open |
|-----------+----------+------------+------------+-----------|
| 256KB | Open | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP5 |
|----------+-------------------+---------+-------------------|
| 80486SX | Open | Open | pins 2 & 3 closed |
|----------+-------------------+---------+-------------------|
| 80486DX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+