WESTERN DIGITAL CORPORATION

WD286-WDM20

Processor

80286

Processor Speed

12.5MHz

Chip Set

Faraday

Max. Onboard DRAM

4MB

Cache

None

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

Parallel port, serial ports (2), bus mouse port, floppy drive interface, ST506/412 interface, video interface, IDE interface

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface (optional)

J5

Floppy drive interface

J16

Hard drive access LED

J10

ST506/412 drive control

J17

Reset switch

J11

Serial port 1

J19

ST506/412 data (Drive 0)

J12

Serial port 2

J20

ST506/412 data (Drive 1)

J13

Video interface

J21

Power LED & keylock

J14

PS/2 mouse port

J22

Parallel port (LPT1)

J15

Speaker

J24

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

W4 & W6

Open

»

Factory configured - do not alter

W7

Closed

»

Floppy drive interrupt enabled (IRQ6)

W8

Closed

 

Floppy drive interrupt disabled (IRQ6)

W8

Open

»

Keyboard select AT compatible (101 key)

W12

Open

 

Keyboard select XT compatible (83 key)

W12

Closed

»

Video port interrupt enabled (IRQ9)

W13

Closed

 

Video port interrupt disabled (IRQ9)

W13

Open

»

Mouse port interrupt enabled (IRQ12)

W17

Closed

 

Mouse port interrupt disabled (IRQ12)

W17

Open

»

Parallel port interrupt enabled (IRQ7)

W19

Closed

 

Parallel port interrupt disabled (IRQ7)

W19

Open

»

Serial port 2 interrupt enabled (IRQ3)

W20

Closed

 

Serial port 2 interrupt disabled (IRQ3)

W20

Open

»

Serial port 1 interrupt enabled (IRQ4)

W21

Closed

 

Serial port 1 interrupt disabled (IRQ4)

W21

Open

»

Video port NMI enabled

W23

Closed

 

Video port NMI disabled

W23

Open

»

Video port data buffering enabled

W24

pins 1 & 2 closed

 

Video port data buffering disabled

W24

pins 2 & 3 closed

»

Video port enabled

W25

Closed

 

Video port disabled

W25

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(2) 256K x 9

(2) 256K x 9

2MB

(2) 1M x 9

NONE

4MB

(2) 1M x 9

(2) 1M x 9

8MB

(2) 4M x 9

NONE

10MB

(2) 1M x 9

(2) 4M x 9

16MB

(2) 4M x 9

(2) 4M x 9

VIDEO CONFIGURATION

Type

S1/1

S1/2

S1/3

S1/4

S1/5

W18

Monochrome

Off

Off

On

Off

Off

1 & 2

CGA-40 columns

On

Off

Off

On

Off

2 & 3

CGA-80 columns

Off

Off

Off

On

Off

2 & 3

EGA-200 lines

On

On

On

Off

Off

2 & 3

EGA-350/480 lines

Off

On

On

Off

Off

2 & 3

Note: Pins designated should be in the closed position.

HARD DRIVE CONFIGURATION

Type

W3

W5

W10

W22

ST506/412

Closed

Closed

Open

Open

IDE

Open

Open

Closed

Closed

Expansion card

Open

Open

Open

Open

Note:An expansion card hard drive controller may be used in addition to the ST506/412 with the ST506/412 Settings.