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# JC INFORMATION SYSTEMS CORPORATION
MODEL 2020
Processor 80386DX
Processor Speed 25/33MHz
Chip Set C & T PEAK/DM
Max. Onboard DRAM 32MB
Cache 64KB
BIOS C & T/Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------------+----------+--------------+----------|
| External battery | J4 | Speaker | SPK |
|-----------------------+----------+--------------+----------|
| Power LED & keylock | KEYL | Self test | TEST |
|-----------------------+----------+--------------+----------|
| Reset switch | RSW | Turbo LED | TLED |
|-----------------------+----------+--------------+----------|
| 32-bit external | S1 | Turbo switch | TSW |
| memory card | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | W2 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | W3 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | W6 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | W9 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | W10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | W10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | W11 | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | W11 | open |
|------------------------------------------------------------|
| Note:The locations of W2, W3, W6, and W9 are unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | W4 |
|--------+---------------+---------------+-------------------|
| 1MB | (4) 256K x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 4MB | (4) 1M x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 | pins 2 & 3 closed |
|--------+---------------+---------------+-------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 16MB | (4) 4M x 9 | NONE | pins 1 & 2 closed |
|--------+---------------+---------------+-------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache CACHE | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | CACHE | (2) 16K x 1 |
+------------------------------------------------------------+