WD286-WDM20 Motherboard Settings and Configuration

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.

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WD286-WDM20 Motherboard Settings and Configuration

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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.