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# JETPRO INFOTECH COMPANY, LTD.
MB-4F3(MB-450C4FV)
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set FOREX
Max. Onboard DRAM 32MB
SRAM 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 | JP2 | Turbo switch | JP15 |
|-------------------+----------+------------------+----------|
| Reset switch | JP3 | Turbo LED | JP16 |
|-------------------+----------+------------------+----------|
| Power LED & | JP9 | 32-bit VESA card | S1 & S2 |
| keylock | | (2) | |
|-------------------+----------+------------------+----------|
| Speaker | JP10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery select internal | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery select external | JP2 | connected |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP6 | open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP6 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP7A | JP7B | JP7C | JP102 | JP103 |
|-----------------+--------+-------+-------+--------+--------|
| 66MHz(internal) | pins 1 | pins | pins | pins 1 | pins 1 |
| | & 2 | 1 & 2 | 2 & 3 | & 2 | & 2 |
|-----------------+--------+-------+-------+--------+--------|
| 50MHz | pins 2 | pins | pins | pins 2 | pins 2 |
| | & 3 | 1 & 2 | 2 & 3 | & 3 | & 3 |
|-----------------+--------+-------+-------+--------+--------|
| 50MHz(internal) | pins 1 | pins | pins | pins 1 | pins 1 |
| | & 2 | 2 & 3 | 1 & 2 | & 2 | & 2 |
|-----------------+--------+-------+-------+--------+--------|
| 33MHz | pins 1 | pins | pins | pins 1 | pins 1 |
| | & 2 | 1 & 2 | 2 & 3 | & 2 | & 2 |
|-----------------+--------+-------+-------+--------+--------|
| 25MHz | pins 1 | pins | pins | pins 1 | pins 1 |
| | & 2 | 2 & 3 | 1 & 2 | & 2 | & 2 |
|-----------------+--------+-------+-------+--------+--------|
| 20MHz | pins 2 | pins | pins | pins 1 | pins 1 |
| | & 3 | 1 & 2 | 1 & 2 | & 2 | & 2 |
|------------------------------------------------------------|
| Note:JP102 controls VESA Bus wait states. JP103 controls |
| VESA bus speed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP12 | JP13 | JP29 | JP30 |
|----------------+----------+----------+----------+----------|
| 80486DX2 | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| | 2 closed | 2 closed | 2 closed | 2 closed |
|----------------+----------+----------+----------+----------|
| 80486DX2(PQFP) | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|----------------+----------+----------+----------+----------|
| ODP486SX | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| | 2 closed | 2 closed | 3 closed | 3 closed |
|----------------+----------+----------+----------+----------|
| 80486DX(PQFP) | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|----------------+----------+----------+----------+----------|
| 80486DX(PGA) | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| | 2 closed | 2 closed | 2 closed | 2 closed |
|----------------+----------+----------+----------+----------|
| 80487SX | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| | 2 closed | 2 closed | 3 closed | 3 closed |
|----------------+----------+----------+----------+----------|
| 80486SX(PQFP) | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8D | JP8E |
|-------+-------------+------------+------------+------------|
| 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+