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# DATAEXPERT CORPORATION
OPTI-495SX-2VL
Device Mainboard
Type
Processor 80386DX/CX486DLC/CX486DLC/80486SX/80486DX
Processor 8/10/12/16/20/25/33/40/50(internal)/50/60/66(internal)/66/75
Speed
(internal)/80(internal)/100(internal)/120(internal)/75/90MHz
Chip Set OPTI
Maximum 32MB
Onboard
Memory
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (2)
Options
NPU 80387, CX87DLC
options
(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 | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | JP2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP4 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP5 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP6 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP17 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP18 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP19 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP20 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP21 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP22 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP23 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP4 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP31 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | JP34 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | JP34 | Open |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP35 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP35 | Pins 3 & 4 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Battery type select external | JP35 | Closed |
|---+---------------------------------+-------+--------------|
| | 80387 PGA installed | JP36 | Closed |
|---+---------------------------------+-------+--------------|
| | 80387 PQFP installed | JP36 | Open |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | S1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | S2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | S3 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | None | (1) 32K 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 SELECTION |
|------------------------------------------------------------|
| Type | JP7 |
|-------------------------------+----------------------------|
| 80386DX (PQFP) | Open |
|-------------------------------+----------------------------|
| 80386DX (PGA) | Closed |
|-------------------------------+----------------------------|
| CX486DLC (PGA) | Closed |
|-------------------------------+----------------------------|
| CX 486DLC | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP10 | JP11 | JP12 | JP16 | JP33 |
|-------------+--------+--------+-------+------+------+------|
| 80386DX-25 | Open | Closed | 1 & 2 | 2 & | 2 & | 1 & |
| | | | | 3 | 3 | 2 |
|-------------+--------+--------+-------+------+------+------|
| 80386DX-33 | Closed | Open | 1 & 2 | 2 & | 2 & | 1 & |
| | | | | 3 | 3 | 2 |
|-------------+--------+--------+-------+------+------+------|
| 80386DX-40 | Open | Open | 1 & 2 | 2 & | 2 & | 1 & |
| | | | | 3 | 3 | 2 |
|-------------+--------+--------+-------+------+------+------|
| CX486DLC-33 | Closed | Open | 1 & 2 | 2 & | 2 & | 1 & |
| | | | | 3 | 3 | 2 |
|-------------+--------+--------+-------+------+------+------|
| CX486DLC-40 | Open | Open | 1 & 2 | 2 & | 2 & | 1 & |
| | | | | 3 | 3 | 2 |
|-------------+--------+--------+-------+------+------+------|
| 80486SX-25 | Open | Closed | 2 & 3 | 1 & | 1 & | 2 & |
| | | | | 2 | 2 | 3 |
|-------------+--------+--------+-------+------+------+------|
| 80486DX-33 | Closed | Open | 2 & 3 | 1 & | 1 & | 2 & |
| | | | | 2 | 2 | 3 |
|-------------+--------+--------+-------+------+------+------|
| 80486DX-50 | Open | Closed | 1 & 2 | 1 & | 1 & | 2 & |
| | | | | 2 | 2 | 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (80486 ONLY) |
|------------------------------------------------------------|
| 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 |
+------------------------------------------------------------+