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# UNIDENTIFIED
OPTI495SLC VL-BUS 3/486
Processor 80386DX/CX486DLC/80486SX/80487DX/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. Onboard 64MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 230mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options 80387DX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo switch | J1 | Reset switch | J5 |
|---------------+----------+----------------------+----------|
| Power LED & | J2 | External battery | J6 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J3 | 32-bit VESA Local | SL1 & |
| | | bus slots | SL2 |
|---------------+----------+----------------------+----------|
| Turbo LED | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Turbo mode enabled | J1 | Open |
|---+----------------------------------+--------+------------|
| | Turbo mode disabled | J1 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | J6 | pins 2 & 3 |
| | (Internal Battery) | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J6 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP7 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP9 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Cyrix PQFP disabled | JP10 | Closed |
|---+----------------------------------+--------+------------|
| | Cyrix PQFP enabled | JP10 | Open |
|---+----------------------------------+--------+------------|
| » | 80386DX/80486SX PQFP disabled | JP16 | Closed |
|---+----------------------------------+--------+------------|
| | 80386DX/80486SX PQFP enabled | JP16 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP21 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP21 | Closed |
|---+----------------------------------+--------+------------|
| » | Battery type select NI-CD | JP29 | pins 2 & 3 |
| | recharge | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select Lithum | JP29 | pins 1 & 2 |
| | discharge | | 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP13 | JP17 | JP18 | JP20 | JP24 | JP27 | JP28 |
|-------+--------+--------+------+------+------+------+------|
| 64KB | Open | Open | 2 & | 1 & | Open | Open | Open |
| | | | 3 | 2 | | | |
|-------+--------+--------+------+------+------+------+------|
| 128KB | Open | Closed | 1 & | 2 & | Open | Open | Open |
| | | | 2 | 3 | | | |
|-------+--------+--------+------+------+------+------+------|
| 256KB | Closed | Closed | 2 & | 1 & | Open | Open | Open |
| | | | 3 | 2 | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP12 | JP14 | JP15 |
|-----------+-------------------+-------------------+--------|
| 80386 | pins 1 & 2 closed | pins 1 & 2 closed | Open |
|-----------+-------------------+-------------------+--------|
| 80486 | pins 2 & 3 closed | pins 2 & 3 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (80486) |
|------------------------------------------------------------|
| Type | JP5 | JP6 | JP19 |
|-------------+------------------+--------+------------------|
| 80486SX | Open | Open | pins 2 & 3 |
| | | | closed |
|-------------+------------------+--------+------------------|
| 80487SX | pins 2 & 3 | Closed | pins 1 & 2 |
| | closed | | closed |
|-------------+------------------+--------+------------------|
| 80486DX/DX2 | pins 1 & 2 | Closed | pins 1 & 2 |
| | closed | | closed |
|-------------+------------------+--------+------------------|
| Overdrive | pins 2 & 3 | Closed | pins 1 & 2 |
| | closed | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80386DX & CX486DLC) |
|------------------------------------------------------------|
| Speed | JP1 | JP2 | JP3 | JP4 | JP22 |
|----------+----------+----------+----------+--------+-------|
| 33MHz | Closed | Open | Closed | 2 & 3 | Open |
|----------+----------+----------+----------+--------+-------|
| 40MHz | Closed | Closed | Closed | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486) |
|------------------------------------------------------------|
| Speed | JP1 | JP2 | JP3 | JP4 | JP22 |
|----------+----------+----------+--------+--------+---------|
| 25MHz | Open | Open | Open | 1 & 2 | Closed |
|----------+----------+----------+--------+--------+---------|
| 33MHz | Open | Closed | Open | 1 & 2 | Open |
|----------+----------+----------+--------+--------+---------|
| 40MHz | Closed | Closed | Open | 1 & 2 | Open |
|----------+----------+----------+--------+--------+---------|
| 50iMHz | Open | Open | Open | 1 & 2 | Closed |
|----------+----------+----------+--------+--------+---------|
| 50MHz | Closed | Open | Open | 1 & 2 | Open |
|----------+----------+----------+--------+--------+---------|
| 66iMHz | Open | Closed | Open | 1 & 2 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA CARD CONFIGURATION |
|------------------------------------------------------------|
| Card Type | JP23 |
|-----------------------------------------------+------------|
| Use standard VESA card with (all CPU’s) | pins 1 & 2 |
| | closed |
|-----------------------------------------------+------------|
| Use DC-680DT VGA, Tekram VESA cache IDE or | pins 2 & 3 |
| other special card (486DX-50 only) | closed |
+------------------------------------------------------------+