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# JC INFORMATION SYSTEMS CORPORATION
486 SX/DX MODEL 270
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set C & T
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit memory expansion slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J11 | 32 bit memory | SL1 |
| | | expansion slot | |
|------------------+----------+-------------------+----------|
| Power LED & | J20 | Reset switch | SW1 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Speaker | J21 | Turbo switch | SW2 |
|------------------+----------+-------------------+----------|
| Turbo LED | JP11 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | Enable onboard battery | JP1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Enable external battery | JP1 | Open |
|---+---------------------------------+--------+-------------|
| » | Monitor type select color | JP2 | Closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP2 | Open |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP3 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP4 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP5 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP7 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP9 | N/A |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP10 | N/A |
|---+---------------------------------+--------+-------------|
| » | Turbo switch not available | JP11 | Closed |
|---+---------------------------------+--------+-------------|
| » | Factory configured do not alter | JP12 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+