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# ABC COMPUTER COMPANY, LTD.
A3875
Processor 80386DX
Processor Speed 25/33/40MHz
Chip Set Forex
Max. Onboard DRAM 32MB
Cache 32/64/128KB
BIOS AMI
Dimensions 332mm x 218mm
I/O Options None
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J3 | Turbo switch | J10 |
|------------------+----------+-------------------+----------|
| Reset switch | J8 | Speaker | J11 |
|------------------+----------+-------------------+----------|
| Turbo LED | J9 | Power LED & | J12 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | J1 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | J1 | Open |
|---+----------------------------------+--------+------------|
| » | External battery select 3.6VDC | J4 | Closed |
|---+----------------------------------+--------+------------|
| | External battery select 6VDC | J4 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | J5 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J5 | Closed |
|---+----------------------------------+--------+------------|
| » | NPU mode select synchronous with | J6 | pins 1 & 2 |
| | CPU | | closed |
|---+----------------------------------+--------+------------|
| | NPU mode select asynchronous | J6 | pins 2 & 3 |
| | with CPU | | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U41) | TAG (U42) |
|-------+-------------+------------+------------+------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 8K x 8 | (2) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x | NONE |
| | | | 8 | |
|------------------------------------------------------------|
| Note: Bank 0 = U44, U46, U48 & U50 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J7 |
|----------------------------+-------------------------------|
| 32KB | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 64KB | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 128KB | pins 2 & 3 closed |
+------------------------------------------------------------+