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486 VESA

AIM MOTHERBOARD COMPANY

486 VESA

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/50(internal)/50/66(internal)MHz

Chip Set

UNI

Max. Onboard DRAM

128MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J4

Turbo switch

JP17

Power LED & keylock

J5

32-bit VESA Local bus slots

S1

Speaker

J6

32-bit VESA Local bus slots

S2

Reset switch

JP18

32-bit VESA Local bus slots

S3

Turbo LED

JP16

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP1

Closed

 

Monitor type select monochrome

JP1

Open

CMOS memory normal operation

JP2

pins 1 & 2 closed

 

CMOS memory clear

JP2

pins 2 & 3 closed

Factory configured - do not alter

JP20

Closed

V-L bus clock select - normal

JP43

pins 2 & 3 closed

 

V-L bus clock select - adjusted

JP43

pins 1 & 2 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

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

65MB

(4) 16M x 9

(4) 256K x 9

68MB

(4) 16M x 9

(4) 4M x 9

80MB

(4) 16M x 9

(4) 4M x 9

128MB

(4) 16M x 9

(4) 16M x 9

CPU TYPE CONFIGURATION

Type

JP4

JP19

JP44

80486SX

pins 5 & 6 closed

Open

pins 2 & 3 closed

80487SX

pins 2 & 3, 4 & 5, 6 & 7 closed

Open

pins 2 & 3 closed

80486DX/33

pins 1 & 2, 4 & 5, 6 & 7 closed

Open

pins 2 & 3 closed

80486DX/50

pins 1 & 2, 4 & 5, 6 & 7 closed

Closed

pins 1 & 2 closed

80486DX2

pins 1 & 2, 4 & 5, 6 & 7 closed

Open

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

JP29

JP30

JP31

20MHz

Open

Closed

Closed

25Mhz

Closed

Open

Closed

33MHz

Closed

Closed

Open

50i MHz

Open

Closed

Open

50MHz

Closed

Open

Closed

66i MHz

Closed

Closed

Open

CACHE JUMPER CONFIGURATION

Size

JP6

JP7

JP9

JP11

32KB

Open

Open

Open

pins 2 & 3 closed

64KB

Open

Closed

Open

pins 1 & 2 closed

128KB

Open

Closed

Closed

pins 1 & 2 and 3 & 4 closed

256KB

Closed

Closed

Closed

pins 1 & 2 and 4 & 5 closed

VESA CONFIGURATION

Setting

JP40

JP41

JP42

V-L bus master

Open

Open

Open

V-L bus slave

Closed

Closed

Closed