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486SX-DX MAINBOARD

UNIDENTIFIED

486SX-DX MAINBOARD

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

33/40/50/66(internal)MHz

Chip Set

Unidentifed

Max. Onboard DRAM

32MB

Cache

None

BIOS

Award

Dimensions

254mm x 220mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

CN1

Power LED & keylock

J1

Parallel port

CN2

Turbo switch

J2 pins 1 & 2

Serial port 1

CN3

Turbo LED

J2 pins 4 & 5

Serial port 2

CN4

Speaker

J3

PS/2 mouse port

CN5

Reset switch

J4

IDE interface

CN6

IDE interface LED

J5

Floppy drive interface

CN7

Riser Card

SL1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Video mode select interlaced

JP7

Closed

 

Video mode select non-interlaced

JP7

Open

Monitor type select monochrome

JP10

Closed

 

Monitor type select color

JP10

Open

CPU OSC select 66MHz

jp11

pins 2 & 3 closed

 

CPU OSC select 50MHz

jp11

pins 1 & 2 closed

On board VGA enabled

JP12

pins 2 & 3 closed

 

On board VGA disabled

JP12

pins 1 & 2 closed

Monitor type select VESA

JP14

pins 2 & 3 closed

 

Monitor type select VGA

JP14

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) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CPU TYPE CONFIGURATION

Type

JP4

JP5

80486SX

Open

pins 1 & 2 closed

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

80486DX2

pins 2 & 3 closed

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

JP3

JP6

33MHz

pins 2 & 3 closed

pins 2 & 3 closed

40MHz

pins 2 & 3 closed

pins 1 & 2 closed

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

66iMHz

pins 1 & 2 closed

pins 1 & 2 closed