UNIDENTIFIED

SIH 486B

Processor

80486SX/80486DX/P23N/P23T

Processor Speed

16/20/25/33/40/50MHz

Chip Set

ASIC

Video Chip Set

None

Maximum Onboard Memory

32MB

Maximum Video Memory

None

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

218mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

J5

Power LED & keylock

J3

Turbo switch

J7

Speaker

J4

Reset switch

J8

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Monitor type select color

J2

Open

 

Monitor type select monochrome

J2

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

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG 0

TAG 1

32KB

(4) 8K x 8

None

(1) 16K x 4

(1) 8K x 8

64KB

(4) 8K x 8

(4) 8K x 8

(1) 16K x 4

(1) 8K x 8

128KB

(4) 32K x 8

None

(1) 16K x 4

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 16K x 4

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

J11

J12

J13

J14

J15

32KB

1 & 2

Open

1 & 2

1 & 2

1 & 2

64KB

2 & 3

Open

1 & 2

2 & 3

1 & 2

128KB

1 & 2

1 & 2

2 & 3

2 & 3

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (CON’T)

Size

J16

J17

J18

J19

32KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

64KB

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

128KB

Pins 1 & 2 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

CPU SPEED SELECTION

Speed

OSC installed in Y1

J9

16MHz

32MHz

Pins 2 & 3 closed

20MHz

40MHz

Pins 2 & 3 closed

25MHz

50MHz

Pins 2 & 3 closed

25MHz

25MHz

Pins 1 & 2 closed

33MHz

33MHz

Pins 1 & 2 closed

50MHz

50MHz

Pins 1 & 2 closed

CPU TYPE SELECTION

Type

J20

J21

J22

80486SX

Open

Pins 2 & 3 closed

Open

80486DX

Closed

Pins 1 & 2 closed

Pins 1 & 2 closed

P23N

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

P23T

Closed

Pins 1 & 2 closed

Pins 1 & 2 closed