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# UNIDENTIFIED
MB4D33L
Processor 80386DX/TI486DLC/80486SX/80486DX/80486DX2
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI/Award
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | JP4 | Turbo switch | JP18 |
|-------------------+----------+------------------+----------|
| Speaker | JP15 | Reset switch | JP25 |
|-------------------+----------+------------------+----------|
| Power LED & | JP16 | 32-bit VESA | SL1 & |
| keylock | | local bus slots | SL2 |
|-------------------+----------+------------------+----------|
| Turbo LED | JP17 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | I/O bus speed select CLKIN/4 | JP5 | Closed |
|---+--------------------------------+--------+--------------|
| | I/O bus speed select CLKIN/5 | JP5 | Open |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP6 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP6 | Open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP14 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP14 | pins 2 & 3 |
| | | | 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) 1M x 9 | (4) 4M 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 | JP1 | JP2 | JP3 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP7 | JP8 | JP11 | JP13 |
|-----------+---------+---------+-------------------+--------|
| 80386DX | Open | Open | pins 2 & 3 closed | Open |
|-----------+---------+---------+-------------------+--------|
| TI486DLC | Closed | Closed | pins 2 & 3 closed | Open |
|-----------+---------+---------+-------------------+--------|
| 80486SX | Open | Open | pins 1 & 2 closed | Closed |
|-----------+---------+---------+-------------------+--------|
| 80486DX | Open | Open | pins 1 & 2 closed | Closed |
|-----------+---------+---------+-------------------+--------|
| 80486DX2 | Open | Open | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (80486 ONLY) |
|------------------------------------------------------------|
| Type | JP9 | JP10 |
|------------------+--------------------+--------------------|
| 80486SX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80386 ONLY) |
|------------------------------------------------------------|
| Speed | JP12 | JP19 | JP20 | JP21 | JP22 | JP23 | JP24 |
|-------+-------+-------+-------+------+-------+------+------|
| 25MHz | 1 & 2 | Open | 2 & 3 |1 & 2 | Open |Closed| Open |
|-------+-------+-------+-------+------+-------+------+------|
| 33MHz | 1 & 2 | Open | 2 & 3 |1 & 2 | Open | Open |Closed|
|-------+-------+-------+-------+------+-------+------+------|
| 40MHz | 1 & 2 |Closed | 2 & 3 |1 & 2 |Closed | Open | Open |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486 ONLY) |
|------------------------------------------------------------|
| Speed | JP12 | JP19 | JP20 | JP21 | JP22 | JP23 | JP24 |
|--------+-------+-------+------+------+-------+------+------|
| 20MHz | 1 & 2 | Open |1 & 2 |1 & 2 | Open |Closed|Closed|
|--------+-------+-------+------+------+-------+------+------|
| 25MHz | 1 & 2 | Open |1 & 2 |1 & 2 | Open |Closed| Open |
|--------+-------+-------+------+------+-------+------+------|
| 33MHz | 1 & 2 | Open |1 & 2 |1 & 2 | Open | Open |Closed|
|--------+-------+-------+------+------+-------+------+------|
| 40MHz | 2 & 3 |Closed |2 & 3 |2 & 3 |Closed |Closed|Closed|
|--------+-------+-------+------+------+-------+------+------|
| 50iMHz | 1 & 2 | Open |1 & 2 |1 & 2 | Open |Closed| Open |
|--------+-------+-------+------+------+-------+------+------|
| 50MHz | 2 & 3 |Closed |2 & 3 |2 & 3 |Closed |Closed| Open |
|--------+-------+-------+------+------+-------+------+------|
| 66iMHz | 1 & 2 | Open |1 & 2 |1 & 2 | Open | Open |Closed|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA SLOT ID CONFIGURATION |
|------------------------------------------------------------|
| Type | jp26 | jp27 |
|--------------------+-------------------+-------------------|
| 80386 serials | Open | Closed |
|--------------------+-------------------+-------------------|
| 80486 serials | Closed | Open |
+------------------------------------------------------------+