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SI-433C1/SI-450C1

UNIDENTIFIED

SI-433C1/SI-450C1

Processor

80486SX/80487SX/80486DX

Processor Speed

16/20/25/33/50MHz

Chip Set

Unidentified

Max. Onboard DRAM

32MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

CN3

Power LED & keylock

CN6

Reset switch

CN4

Speaker

CN7

Turbo switch

CN5

Turbo LED

LED2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Power good signal detect from board

JP7

pins 1 & 2 closed

 

Power good signal detect from power supply

JP7

pins 2 & 3 closed

CMOS memory normal operation

JP17

pins 1 & 2 closed

 

CMOS memory clear

JP17

pins 2 & 3 closed

Monitor type select monochrome

JP19

Open

 

Monitor type select color

JP19

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) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

DRAM JUMPER CONFIGURATION

Setting

JP20

JP21

Bank 0

pins 2 & 3 closed

pins 1 & 2 closed

Bank 1

pins 1 & 2 closed

pins 2 & 3 closed

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U21)

TAG (U22)

TAG (U39)

32KB

(4) 8K x 8

NONE

(1) 4K x 4

(1) 4K x 4

NONE

64KB

(4) 8K x 8

(4) 8K x 8

(1) 4K x 4

(1) 4K x 4

(1) 16K x 4

128KB

(4) 32K x 8

NONE

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

JP12

JP13

JP14

JP15

JP16

32KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

64KB

2 & 3

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

2 & 3

2 & 3

1 & 2

128KB

2 & 3

2 & 3

1 & 2

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP4

JP5

JP6

80486SX

pins 2 & 3 closed

Open

Open

80487SX

pins 1 & 2 closed

Closed

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

Closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP3

16MHz

pins 2 & 3 closed

20MHz

pins 2 & 3 closed

25MHz

pins 2 & 3 closed

33MHz

pins 1 & 2 closed

50MHz

pins 1 & 2 closed