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# FORCOM TECHNOLOGY CORPORATION
B637/B638/B639
Processor 80386SX
Processor Speed 16/20/25MHz
Chip Set Headland
Max. Onboard DRAM 8MB
Cache None
BIOS AMI/Quadtel
Dimensions 246.6mm x 216.8mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Turbo LED | P1 | Reset switch | P5 |
|-------------------+----------+------------------+----------|
| Speaker | P2 | External battery | P6 |
|-------------------+----------+------------------+----------|
| Power LED & | P3 | Turbo switch | W2 |
| Keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP103 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP103 | Closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | P7 | pins 1 & 2 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | P7 | pins 2 & 3 |
| | power supply | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 512KB | (2) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 1MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 1.5MB | (2) 256K x | (2) 256K x | (2) 256K x | NONE |
| | 9 | 9 | 9 | |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 256K x | (2) 256K x | (2) 256K x | (2) 256K x |
| | 9 | 9 | 9 | 9 |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 3MB | (2) 256K x | (2) 256K x | (2) 1M x 9 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 4.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | NONE |
| | | | 9 | |
|-------+-------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | (2) 256K x |
| | | | 9 | 9 |
|-------+-------------+------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE |
|-------+-------------+------------+------------+------------|
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
+------------------------------------------------------------+