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# MULTIBEST INDUSTRIAL & MANUFACTURING, INC.
MB4861DX/SX
Processor 80486SX/80486DX
Processor Speed 20/25/33MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm 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 |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP2 | Open |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP2 | Closed |
|---+--------------------------------+--------+--------------|
| » | Bus speed select ATCLK/4 | JP6 | Open |
|---+--------------------------------+--------+--------------|
| | Bus speed select ATCLK/6 | JP6 | Closed |
|---+--------------------------------+--------+--------------|
| » | CPU clock select iOSC/2 | JP7 | Closed |
|---+--------------------------------+--------+--------------|
| | CPU clock select iOSC/1 | JP7 | 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) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP12 |
|-----------+----------+------------+------------+-----------|
| 64KB | Open | Open | Open | Open |
|-----------+----------+------------+------------+-----------|
| 256KB | Open | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP4 | JP5 |
|---------+-------------------+----------+-------------------|
| 80486SX | Open | Open | pins 2 & 3 closed |
|---------+-------------------+----------+-------------------|
| 80486DX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+