Device Type

Mainboard

Processor

80486SX/80486DX/80486DX2/80486DX4/P24T

Processor Speed

25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz

Chip Set

Unidentified

Maximum Onboard Memory

64MB

Cache

256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

C1

Serial port 1

CN2

Turbo switch

C2

IDE interface 2

CN3

Speaker

C3

IDE interface 1

CN4

Reset switch

C4

Floppy drive interface

CN5

Power LED & keylock

C5

PS/2 mouse port

J13

IDE interface LED

C6

Parallel port

J16

Serial port 2

CN1

32-bit VESA local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

W1

Closed

»

Monitor type select color

W2

Closed

Monitor type select monochrome

W2

Open

»

PS/2 mouse IRQ12 enabled

W3

Closed

PS/2 mouse IRQ12 disabled

W3

Open

»

CMOS memory normal operation

W5

Open

CMOS memory clear

W5

Closed

»

Factory configured - do not alter

W8

Pins 1 & 2 closed

»

Factory configured - do not alter

W10

Pins 1 & 2 closed

»

Factory configured - do not alter

W11

Pins 1 & 2 closed

»

Factory configured - do not alter

W13

Open

»

Factory configured - do not alter

W16

Pins 1 & 2 closed

»

Factory configured - do not alter

W17

Pins 1 & 2 closed

»

Factory configured - do not alter

W18

Open

»

Factory configured - do not alter

W19

Closed

»

Factory configured - do not alter

W22

Pins 1 & 2 closed

»

Factory configured - do not alter

W23

Pins 1 & 2 closed

»

Factory configured - do not alter

W24

Pins 1 & 2 closed

»

Factory configured - do not alter

W25

Open

»

IDE interface 1 enabled

W34

Pins 2 & 3 closed

IDE interface 1 disabled

W34

Pins 1 & 2 closed

»

Factory configured - do not alter

W35

Open

»

Parallel port IRQ select IRQ7

W36

Pins 2 & 3 closed

Parallel port IRQ select IRQ5

W36

Pins 1 & 2 closed

»

Factory configured - do not alter

W39

Open

»

Factory configured - do not alter

W40

Open

»

Factory configured - do not alter

SW1/2

On

»

Factory configured - do not alter

SW1/3

Off

»

Factory configured - do not alter

SW1/4

Off

Note: The location of the factory configured jumpers are unidentified.

SIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 4M x 36

None

None

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

20MB

(1) 4M x 36

(1) 1M x 36

None

None

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

None

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 4M x 36

(1) 4M x 36

None

None

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

None

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

52MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

256KB

(8) 32K x 8

CPU SPEED SELECTION

Speed

SW1/1

25MHz

Off

33MHz

On

50iMHz

Off

66iMHz

On

75iMHz

Off

100iMHz

On

CPU TYPE SELECTION

Type

W12

80486SX

Pins 2 & 3 closed

80486DX

Pins 1 & 2 closed

80486DX2

Pins 1 & 2 closed

80486DX4

Pins 1 & 2 closed

P24T

Pins 1 & 2 closed

DMA CHANNEL SELECTION

Channel

W37

W38

1

Pins 2 & 3 closed

Pins 2 & 3 closed

» 3

Pins 1 & 2 closed

Pins 1 & 2 closed