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486SI4

UNIDENTIFIED

486SI4

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/50/66(internal)MHz

Chip Set

C & T

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI/C & T

Dimensions

330mm x 218mm

I/O Options

32-bit external video card slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J3

Reset switch

J6

Turbo switch

J4

Power LED & keylock

J7

Speaker

J5

32-bit external video card

S1

Note:32-bit external video card slot may not be present on some board revisions.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Local bus data size select 32 bits

J8

pins 1 & 2 closed

 

Local bus data size select 16 bits

J8

pins 2 & 3 closed

»

Factory configured - do not alter

JP1

Open

»

Monitor type select color

JP2

Closed

 

Monitor type select monochrome

JP2

Open

»

Factory configured - do not alter

JP3

pins 2 & 3 closed

»

Factory configured - do not alter

JP4

pins 2 & 3 closed

»

Factory configured - do not alter

JP5

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

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) 8K x 8

CACHE JUMPER CONFIGURATION

Sizer

SR1

SR2

SR3

SR4

64KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

128KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (CON’T)

Size

SR5

SR6

SR7

SR8

SR9

64KB

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

128KB

1 & 2

2 & 3

2 & 3

1 & 2

1 & 2

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP6

JP7

JP8

80486SX

Open

Open

pins 2 & 3 closed

80487SX

Closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX

Closed

pins 1 & 2 closed

pins 1 & 2 closed