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# UNIDENTIFIED
OPTI-495SX 3/486WB CACHE
Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options 80387DX/CX487DLC
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J1 | Reset switch | J5 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J2 | External battery | JP35 |
|---------------+----------+----------------------+----------|
| Turbo switch | J3 | 32-bit VESA local | SL1 & |
| | | bus slots | SL2 |
|---------------+----------+----------------------+----------|
| Turbo LED | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP2 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP20 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP21 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP24 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP34 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP34 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP35 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP35 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP35 | Closed |
|---+----------------------------------+--------+------------|
| » | NPU type select 80387 PQFP | JP36 | Open |
|---+----------------------------------+--------+------------|
| | NPU type select 80387 PGA | JP36 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S1 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S2 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | S3 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | JP25 | JP26 | JP27 | JP28 |
|---------+-------------------+----------+---------+---------|
| 64KB | pins 2 & 3 closed | Open | Open | Open |
|---------+-------------------+----------+---------+---------|
| 128KB | pins 1 & 2 closed | Open | Closed | Closed |
|---------+-------------------+----------+---------+---------|
| 256KB | pins 2 & 3 closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP7 |
|-------------------------------+----------------------------|
| 80386DX (PQFP) | Open |
|-------------------------------+----------------------------|
| 80386DX (PGA) | Closed |
|-------------------------------+----------------------------|
| CX486DLC | Closed |
|-------------------------------+----------------------------|
| 80486 (PQFP) | Open |
|-------------------------------+----------------------------|
| 80486 (PGA) | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (80486 PGA) |
|------------------------------------------------------------|
| Type | JP8 | JP29 | JP30 |
|-----------+-------------------+-------------------+--------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|-----------+-------------------+-------------------+--------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80386/CX486DLC) |
|------------------------------------------------------------|
| Speed | JP1 | JP10 | JP11 | JP12 | JP16 | JP33 |
|--------+--------+--------+--------+--------+-------+-------|
| 25MHz | Open | Closed | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 33MHz | Closed | Open | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 40MHz | Open | Open | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486) |
|------------------------------------------------------------|
| Speed | JP1 | JP10 | JP11 | JP12 | JP16 | JP33 |
|--------+--------+--------+--------+--------+-------+-------|
| 25MHz | Open | Closed | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 33MHz | Closed | Open | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 50iMHz | Open | Closed | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 50MHz | Open | Closed | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
|--------+--------+--------+--------+--------+-------+-------|
| 66iMHz | Closed | Open | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+