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# FOREX COMPUTER COMPANY
386 CACHE SYSTEM BOARD
Processor 80386DX/AM386DX
Processor Speed 33/40MHz
Chip Set Forex
Max. Onboard DRAM 64MB
Cache 32/64/128KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options external memory card slot
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | JP2 | Speaker | JP10 |
|-------------------+----------+------------------+----------|
| Turbo LED | JP7 | Turbo switch | JP11 |
|-------------------+----------+------------------+----------|
| Reset switch | JP8 | External memory | S1 |
| | | card | |
|-------------------+----------+------------------+----------|
| Power LED & | JP9 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | JP3 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP3 | Closed |
|---+----------------------------------+--------+------------|
| » | NPU mode select synchronous with | JP5 | pins 1 & 2 |
| | CPU | | closed |
|---+----------------------------------+--------+------------|
| | NPU mode select synchronous with | JP5 | pins 2 & 3 |
| | oscillator installed at Y1 | | closed |
|---+----------------------------------+--------+------------|
| » | External battery select 6.0VDC | JP200 | Open |
|---+----------------------------------+--------+------------|
| | External battery select 3.6VDC | JP200 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP201 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP202 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP202 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+---------------+------------+------------+----------|
| 1MB | (4) 256K x 9 | NONE | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 2MB | (4) 256K x 9 | (4) 256K x | NONE | NONE |
| | | 9 | | |
|-------+---------------+------------+------------+----------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 6MB | (4) 256K x 9 | (4) 256K x | (4) 1M x 9 | NONE |
| | | 9 | | |
|-------+---------------+------------+------------+----------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 9MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|-------+---------------+------------+------------+----------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|-------+---------------+------------+------------+----------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x |
| | | | | 9 |
|-------+---------------+------------+------------+----------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|-------+---------------+------------+------------+----------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+---------------+------------+------------+----------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|-------+---------------+------------+------------+----------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x |
| | | | | 9 |
|------------------------------------------------------------|
| Note:Banks 2 & 3 are used when a 32-bit external memory |
| card is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Tag1 | Tag0 |
|-------+-------------+------------+------------+------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x | NONE |
| | | | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP6 |
|----------------------------+-------------------------------|
| 32KB | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 64KB | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 128KB | pins 2 & 3 closed |
+------------------------------------------------------------+