486-VLA Motherboard Settings and Configuration

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

ALI

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

230mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J1

External battery

J6

Power LED & keylock

J2

32-bit VESA Local bus slot

S1

Reset switch

J3

32-bit VESA Local bus slot

S2

Turbo LED

J4

32-bit VESA Local bus slot

S3

Turbo switch

J5

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 JUMPER CONFIGURATION

Size

JP21

JP22

JP23

JP24

64KB

Pins 1 & 2

Pins 1 & 2

Open

Pins 3 & 4

128KB

Pins 2 & 3

Pins 1 & 2

Open

Pins 1 & 2, 3 & 4 and 5 & 6

256KB

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2 and 2 & 3

Pins 1 & 2, 3 & 4 and 5 & 6

Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP6

JP10

JP25/pins 1&2

JP25/pins 3&4

JP25/pins 5&6

JP26

25MHz

Pins 1 & 2

Pins 1 & 2

Open

Closed

Open

Pins 1 & 2

33MHz

Pins 1 & 2

Pins 1 & 2

Closed

Open

Closed

Pins 1 & 2

40MHz

Pins 2 & 3

Pins 2 & 3

Closed

Closed

Open

Pins 2 & 3

50i MHz

Pins 1 & 2

Pins 1 & 2

Open

Closed

Open

Pins 1 & 2

50MHz

Pins 2 & 3

Pins 2 & 3

Open

Closed

Open

Pins 2 & 3

66i MHz

Pins 1 & 2

Pins 1 & 2

Closed

Open

Closed

Pins 1 & 2

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP7

JP9

JP11

JP12

JP16

JP17

JP20

80486SX

Pins 1 & 2

Pins 1 & 2

Closed

Closed

Pins 1 & 2

N/A

Pins 1 & 2

80487SX

Pins 1 & 2

Pins 1 & 2

Closed

Closed

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

80487DX

Pins 1 & 2

Pins 1 & 2

Closed

Closed

Pins 2 & 3

Pins 2 & 3

Pins 1 & 2

80486DX2

Pins 2 & 3

Pins 2 & 3

Open

Open

Pins 1 & 2

N/A

Pins 1 & 2

Note: Pins designated should be in the closed position.

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP1

JP2

£ 33MHz

0 wait states

Pins 1 & 2 closed

Pins 1 & 2 closed

> 33MHz

1 wait state

Pins 2 & 3 closed

Pins 2 & 3 closed