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OPTI495SLC VL-BUS 3/486

UNIDENTIFIED

OPTI495SLC VL-BUS 3/486

Processor

80386DX/CX486DLC/80486SX/80487DX/80486DX/80486DX2

Processor Speed

25/33/40/50(internal)/50/66(internal)MHz

Chip Set

OPTI

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

230mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

80387DX

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo switch

J1

Reset switch

J5

Power LED & keylock

J2

External battery

J6

Speaker

J3

32-bit VESA Local bus slots

SL1 & SL2

Turbo LED

J4

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Turbo mode enabled

J1

Open

 

Turbo mode disabled

J1

Closed

»

CMOS memory normal operation (Internal Battery)

J6

pins 2 & 3 closed

 

CMOS memory clear

J6

pins 3 & 4 closed

»

Factory configured - do not alter

JP7

N/A

»

Factory configured - do not alter

JP9

N/A

»

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 recharge

JP29

pins 2 & 3 closed

 

Battery type select Lithum discharge

JP29

pins 1 & 2 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 & 3

1 & 2

Open

Open

Open

128KB

Open

Closed

1 & 2

2 & 3

Open

Open

Open

256KB

Closed

Closed

2 & 3

1 & 2

Open

Open

Open

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

Closed

pins 1 & 2 closed

80486DX/DX2

pins 1 & 2 closed

Closed

pins 1 & 2 closed

Overdrive

pins 2 & 3 closed

Closed

pins 1 & 2 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 other special card (486DX-50 only)

pins 2 & 3 closed