...because we can't all be on the bleeding edge...





WD286-WDM20

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.