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# UNIDENTIFIED
CMC-820
Processor 80386DX
Processor Speed 10/20MHz
Chip Set C & T
Max. onboard DRAM 16MB
Cache None
BIOS Unknown
Dimensions 330mm x 218mm
I/O Options 32-bit external memory cards (2)
NPU Options 80387DX/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Speaker | J11 |
|------------------+----------+-------------------+----------|
| Turbo LED | J7 | Keylock | J12 |
|------------------+----------+-------------------+----------|
| Reset Switch | J10 | 32-bit system | S1 & S2 |
| | | memory cards | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | BIOS type select 27128 or | J3 | pins 1 & 2 |
| | 27256 | | closed |
|---+---------------------------+---------------+------------|
| | BIOS type select 27512 | J3 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | J5 | Closed |
|---+---------------------------+---------------+------------|
| | Monitor type select | J5 | Open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | NPU enabled | J6 | Closed |
|---+---------------------------+---------------+------------|
| | NPU disabled | J6 | Open |
|---+---------------------------+---------------+------------|
| » | NPU type select Intel or | J9 | Closed |
| | 80387 | | |
|---+---------------------------+---------------+------------|
| | NPU type select Weitek | J9 | Open |
| | 3167 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+------------+------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|--------+------------+------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|--------+------------+------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|--------+------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|--------+------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|--------+------------+------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | 9 | | |
|--------+------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------------------------------------------------------|
| Note:The numbering of bank 0 and bank 1 are located on the |
| system board. |
| |
| Banks 2 & 3 are located on the external memory card. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J4 | J8 |
|------------------+--------------------+--------------------|
| 10MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 20MHz | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Serial port DB-9 | J101 | Parallel port | J103 |
| | | DB-9 | |
|------------------+----------+-------------------+----------|
| Serial port | J102 | Parallel port | J104 |
| 10-pins header | | 10-pins header | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O CONFIGURATION |
|------------------------------------------------------------|
| Port |SW1/switch|SW1/switch|SW1/switch|SW1/switch|
| | 1 | 2 | 3 | 4 |
|----------------+----------+----------+----------+----------|
|Serial port DB-9| On | Off | On | On |
|----------------+----------+----------+----------+----------|
| Serial port | On | On | On | Off |
| 10-pins header | | | | |
|----------------+----------+----------+----------+----------|
| Parallel port | On | On | Off | On |
| DB-9 | | | | |
|----------------+----------+----------+----------+----------|
| Parallel port | Off | On | On | On |
| 10-pins header | | | | |
+------------------------------------------------------------+