486-VLS Motherboard Settings and Configuration

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

230mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

CN1

Turbo switch

CN5

Reset switch

CN2

External battery

CN6

Speaker

CN3

32-bit VESA Local bus slot

S1

Turbo LED

CN4

32-bit VESA Local bus slot

S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

80486 (PQFP)

JP16

Open

80486(PGA)

JP16

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

CPU TYPE CONFIGURATION

Type

JP13

JP14

JP15

80486SX

Open

pins 2 & 3 closed

Open

80487SX

pins 2 & 3 closed

pins 1 & 2 closed

Closed

80486DX

pins 1 & 2 closed

pins 1 & 2 closed

Closed

80486DX2

pins 1 & 2 closed

pins 1 & 2 closed

Closed

CPU SPEED CONFIGURATION

Type

JP20

JP21

JP22

25MHz

Closed

Open

Open

33MHz

Closed

Closed

Closed

40MHz

Closed

Closed

Open

50MHz

Open

Open

Closed

CACHE JUMPER CONFIGURATION

Size

JP1

JP2

JP3

JP4

JP5

JP6

JP7

64KB

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

N/A

pins 1 & 2

128KB

pins 2 & 3

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

256KB

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

Note: Pins designated should be in the closed position.

VESA WAIT STATE/BUS SPEED (S1 & S2) CONFIGURATION

CPU speed

S1/JP8

S1/JP9

S2/JP10

S2/JP11

£ 33MHz

pins 1 & 2 closed

N/A

pins 1 & 2 closed

N/A

> 33MHz

pins 2 & 3 closed

N/A

pins 2 & 3 closed

N/A

0 wait states

N/A

pins 1 & 2 closed

N/A

pins 1 & 2 closed

1 wait state

N/A

pins 2 & 3 closed

N/A

pins 2 & 3 closed