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# JETPRO INFOTECH COMPANY, LTD.
MB-4F
Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor 20/25/33/40/50(internal)/66(internal)
Speed
Chip Set FOREX
Max. Onboard 32MB
DRAM
SRAM Cache 64/128/256KB
BIOS AMI/AWARD
Dimensions 220mm x 340mm
I/O Options None
NPU Options 80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | JP2 | Turbo switch | JP15 |
|---------------------+----------+----------------+----------|
| Reset switch | JP8 | Turbo LED | JP16 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | JP14 | Speaker | JP17 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Parity check enabled | JP5 | closed |
|---+------------------------------------+--------+----------|
| | Parity check disabled | JP5 | open |
|---+------------------------------------+--------+----------|
| » | Monitor type select color | JP6 | closed |
|---+------------------------------------+--------+----------|
| | Monitor type select monochrome | JP6 | open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP19 | 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 |
|------------------+--------------------+--------------------|
| 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 TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP12 | JP13 | JP30 | W1A-W1G | W2A-W2H |
|----------+---------+--------+--------+----------+----------|
| 80486DX2 | pins 1 | pins 1 | pins 1 | pins 1 & | pins 1 & |
| | & 2 | & 2 | & 2 | 2 | 2 |
|----------+---------+--------+--------+----------+----------|
| 80486DX | pins 1 | pins 1 | pins 1 | pins 1 & | pins 1 & |
| | & 2 | & 2 | & 2 | 2 | 2 |
|----------+---------+--------+--------+----------+----------|
| 80487SX | pins 1 | pins 1 | pins 2 | pins 1 & | pins 1 & |
| | & 2 | & 2 | & 3 | 2 | 2 |
|----------+---------+--------+--------+----------+----------|
| 80486SX | pins 2 | pins 2 | pins 2 | pins 1 & | pins 1 & |
| | & 3 | & 3 | & 3 | 2 | 2 |
|----------+---------+--------+--------+----------+----------|
| 80386DX | N/A | N/A | N/A | pins 2 & | pins 2 & |
| | | | | 3 | 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG(U26) | TAG(U42) |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 8K x 8 | Banks 0 & | (1) 8K x 8 | NONE |
| | | 1 | | |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 32K x 8 | Banks 0 & | (1) 8K x 8 | (1) 8K x 8 |
| | | 1 | | |
|------------------------------------------------------------|
| Note:The exact locations of U26 and U42 are unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8C | JP8D | JP8E | JP8F |
|-------+--------+--------+--------+--------+--------+-------|
| 64KB | pins 2 | pins 2 | pins 1 | pins 2 | pins 2 | pins |
| | & 3 | & 3 | & 2 | & 3 | & 3 | 1 & 2 |
|-------+--------+--------+--------+--------+--------+-------|
| 128KB | pins 1 | pins 2 | pins 1 | pins 1 | pins 1 | pins |
| | & 2 | & 3 | & 2 | & 2 | & 2 | 1 & 2 |
|-------+--------+--------+--------+--------+--------+-------|
| 256KB | pins 2 | pins 1 | pins 2 | pins 2 | pins 1 | pins |
| | & 3 | & 2 | & 3 | & 3 | & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+