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# J-MARK COMPUTER CORPORATION
JET-486 CACHE 486-33/486SX-25
Processor 80486SX/80486DX
Processor Speed 25/33MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options 32-bit external memory card slot
NPU Options 80487SX/4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Power LED & | J5 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | J2 | Speaker | J6 |
|------------------+----------+-------------------+----------|
| Turbo switch | J3 | 32-bit external | S1 |
| | | memory card | |
|------------------+----------+-------------------+----------|
| Turbo LED | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP1 | N/A |
|---+------------------------------------+--------+----------|
| » | Monitor type select monochrome | JP2 | Open |
|---+------------------------------------+--------+----------|
| | Monitor type select color | JP2 | Closed |
|---+------------------------------------+--------+----------|
| » | CMOS memory normal operation | JP3 | Closed |
|---+------------------------------------+--------+----------|
| | CMOS memory clear | JP3 | Open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP4 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP11 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP12 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP13 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP14 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP21 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP23 | N/A |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP24 | 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) 256K x 9 | (4) 1 M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG (U22) | TAG (U23) |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | (1) 16K x 4 | NONE |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | (1) 16K x 4 | (1) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP8 | JP22 |
|----------+----------+----------+--------+--------+---------|
| 64KB | Open | Open | 2 & 3 | 2 & 3 | Open |
|----------+----------+----------+--------+--------+---------|
| 256KB | Closed | Closed | 1 & 2 | 1 & 2 | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 | JP10 | JP15 | JP16 |
|----------------+------------+--------+------------+--------|
| 80486SX | pins 1 & 2 | Closed | pins 1 & 2 | Open |
| | closed | | closed | |
|----------------+------------+--------+------------+--------|
| 80486SX + | pins 1 & 2 | Closed | pins 1 & 2 | Open |
| 80487SX | closed | | closed | |
|----------------+------------+--------+------------+--------|
| 80486DX | pins 1 & 2 | Closed | pins 2 & 3 | Closed |
| | closed | | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Type | JP17 | JP18 | JP19 | JP20 |
|------------+-----------+-----------+-----------+-----------|
| 80487SX | Open | Open | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 4167 | Closed | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: In order to use the Weitek 4167, a daughter board |
| must be installed in the CPU socket. You would then insert |
| the NPU and CPU into the daughter board. |
+------------------------------------------------------------+