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OPTI-495SX 3/486WB CACHE

INFOMATIC POWER SYSTEMS CORPORATION

OPTI-495SX 3/486WB CACHE

Processor

80386DX/80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slot (Non-functional)

NPU Options

80387

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

Reset switch

J5

Speaker

J2

External battery

JP18

Turbo switch

J3

32-bit VESA card

S1

Turbo LED

J4

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

JP8

unknown

Factory configured - do not alter

JP9

unknown

Factory configured - do not alter

JP10

unknown

Factory configured - do not alter

JP11

unknown

Monitor type select color

JP17

closed

 

Monitor type select monochrome

JP17

open

CMOS memory normal operation

JP18

pins 2 & 3 closed

 

CMOS memory clear

JP18

pins 3 & 4 closed

 

External battery select

JP18

connected

Factory configured - do not alter

JP23

open

CACHE JUMPER CONFIGURATION

Size

JP6

JP7

JP12

JP13

64KB

open

open

open

pins 2 & 3 closed

128KB

open

closed

closed

pins 1 & 2 closed

256KB

closed

closed

closed

pins 2 & 3 closed

CACHE CONFIGURATION

Size

Cache

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

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) 1 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

32MB

(4) 4M x 9

(4) 4M x 9

CPU MODE CONFIGURATION

Mode

JP3

JP5

JP20

JP21

JP24

486 (PQFP)

pins 1 & 2

pins 2 & 3

open

N/A

pins 2 & 3

486 (PGA)

pins 1 & 2

pins 2 & 3

closed

closed

pins 2 & 3

386 (PQFP)

pins 2 & 3

pins 1 & 2

N/A

open

pins 1 & 2

CPU TYPE CONFIGURATION (PQFP)

Type

JP14

JP22

JP51

JP52

80486SX-33MHz

pins 1 & 2 closed

N/A

open

closed

80486SX-25MHz

pins 1 & 2 closed

N/A

closed

open

80386DX-40MHz

pins 2 & 3 closed

open

open

open

80386DX-33MHz

pins 2 & 3 closed

closed

open

closed

CPU TYPE CONFIGURATION (PGA)

Type

JP1

JP2

JP4

JP14

JP51

JP52

80486DX2-66MHz

closed

pins 1 & 2

pins 1 & 2

pins 1 & 2

open

closed

80486DX2-50MHz

closed

pins 1 & 2

pins 1 & 2

pins 1 & 2

closed

open

ODP486SX-33MHz

closed

pins 1 & 2

pins 2 & 3

pins 1 & 2

open

closed

ODP486SX-25MHz

closed

pins 1 & 2

pins 2 & 3

pins 1 & 2

closed

open

80486DX-50MHz

closed

pins 1 & 2

pins 1 & 2

pins 2 & 3

closed

open

80486DX-33MHz

closed

pins 1 & 2

pins 1 & 2

pins 1 & 2

open

closed

80486DX-25MHz

closed

pins 1 & 2

pins 1 & 2

pins 1 & 2

closed

open

80487SX-33MHz

closed

pins 1 & 2

pins 2 & 3

pins 1 & 2

open

closed

80487SX-25MHz

closed

pins 1 & 2

pins 2 & 3

pins 1 & 2

closed

open

80486SX-33MHz

open

pins 2 & 3

open

pins 1 & 2

open

closed

80486SX-25MHz

open

pins 2 & 3

open

pins 1 & 2

closed

open