...because we can't all be on the bleeding edge...





A486SX/DX

UNIDENTIFIED

A486SX/DX

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

ALI

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 220mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP10

Power LED & keylock

JP21

Reset switch

JP17

Turbo switch

JP22

Speaker

JP20

Turbo LED

JP23

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP4

pins 2 & 3 closed

 

Monitor type select monochrome

JP4

Open

Factory configured - do not alter

JP6

N/A

Battery type select DS1287

JP11

Closed

 

Battery type select 146818

JP11

Open

Clock input select 2x

JP12

pins 1 & 2 closed

 

Clock input select 1x

JP12

pins 2 & 3 closed

Parity check enabled

JP13

pins 1 & 2 closed

 

Parity check disabled

JP13

pins 2 & 3 closed

Factory configured - do not alter

JP18

N/A

PQFP CPU disabled

JP29

Closed

 

PQFP CPU enabled

JP29

Open

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

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U9)

TAG (U11)

64KB

(4) 8K x 8

(4) 8K x 8

NONE

(1) 8K x 8

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

NONE

128KB

(4) 32K x 8

NONE

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 8

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

NONE

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP5

JP7

JP8

JP9

JP24

JP25

JP26

JP27

JP28

64KB

1 & 2

1 & 2

1 & 2

Open

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

64KB

1 & 2

1 & 2

Open

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

128KB

2 & 3

1 & 2

1 & 2

Open

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

256KB

1 & 2

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

256KB

1 & 2

2 & 3

1 & 2

Open

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP14

JP15

JP16

80486SX

pins 1 & 2 closed

pins 1 & 2 closed

Open

80487SX

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX2

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed