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OPTI-495SX-2VL

DATAEXPERT CORPORATION

OPTI-495SX-2VL

Device Type

Mainboard

Processor

80386DX/CX486DLC/CX486DLC/80486SX/80486DX

Processor Speed

8/10/12/16/20/25/33/40/50(internal)/50/60/66(internal)/66/75

(internal)/80(internal)/100(internal)/120(internal)/75/90MHz

Chip Set

OPTI

Maximum Onboard Memory

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU options

80387, CX87DLC

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

Reset switch

J5

Speaker

J2

External battery

JP35

Turbo switch

J3

32-bit VESA local bus slots

SL1 SL2

Turbo LED

J4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

JP2

Unidentified

Factory configured - do not alter

JP2

Unidentified

Factory configured - do not alter

JP4

Unidentified

Factory configured - do not alter

JP5

Unidentified

Factory configured - do not alter

JP6

Unidentified

Factory configured - do not alter

JP17

Unidentified

Factory configured - do not alter

JP18

Unidentified

Factory configured - do not alter

JP19

Unidentified

Factory configured - do not alter

JP20

Unidentified

Factory configured - do not alter

JP21

Unidentified

Factory configured - do not alter

JP22

Unidentified

Factory configured - do not alter

JP23

Unidentified

Factory configured - do not alter

JP4

Unidentified

Factory configured - do not alter

JP31

Unidentified

 

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 alter

S1

Unidentified

Factory configured - do not alter

S2

Unidentified

Factory configured - do not alter

S3

Unidentified

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 & 3

2 & 3

1 & 2

80386DX-33

Closed

Open

1 & 2

2 & 3

2 & 3

1 & 2

80386DX-40

Open

Open

1 & 2

2 & 3

2 & 3

1 & 2

CX486DLC-33

Closed

Open

1 & 2

2 & 3

2 & 3

1 & 2

CX486DLC-40

Open

Open

1 & 2

2 & 3

2 & 3

1 & 2

80486SX-25

Open

Closed

2 & 3

1 & 2

1 & 2

2 & 3

80486DX-33

Closed

Open

2 & 3

1 & 2

1 & 2

2 & 3

80486DX-50

Open

Closed

1 & 2

1 & 2

1 & 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