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WD1002-27X

WESTERN DIGITAL CORPORATION

WD1002-27X

Replaced by the WD1004-27X

Data bus: 8-bit, PC/XT

Size: Half-length, full-height card

Hard drives supported: Two RLL ST506/412 drives

Floppy drives supported: None

Maximum heads/cyl.: 16 heads and 1024 cylinders

CONNECTIONS

Function

Location

34-pin control cable connector-hard drive

J1

20-pin data cable connector-drive 0

J2

20-pin data cable connector-drive 1

J3

5-pin DC power connector

J4

DRIVE TYPE CONFIGURATION

 

DRIVE 1

DRIVE 0

Type #

S1/jumper 1

S1/jumper 2

S1/jumper 3

S1/jumper 4

0

closed

closed

closed

closed

1

open

closed

open

closed

2

closed

open

closed

open

3

open

open

open

open

USER CONFIGURABLE SETTINGS

Function

Location

Setting

BIOS enabled

W3

closed

 

BIOS disabled

W3

open

I/O port address is 324-327h

W4

pins 1 & 2 closed

 

I/O port address is 320-323h

W4

pins 2 & 3 closed

2732 & 2764 BIOS supported (hard-wired)

W5

pins 1 & 2 closed

 

2716 BIOS supported

W5

pins 2 & 3 closed

8 head hard drive with RWC supported

W6

pins 2 & 3 closed

 

16 head hard drive supported

W6

pins 1 & 2 closed

Hard Drive Interrupt is IRQ5 (hard-wired)

W7

pins 1 & 2 closed

 

Hard Drive Interrupt is IRQ2

W7

pins 2 & 3 closed

Single controller setting, primary controller

W8

pins 2 & 3 closed

 

Dual controller setting, secondary controller

W8

pins 1 & 2 closed

Firmware translation enabled

W9

closed

 

Firmware translation disabled

W9

open

Hard Drive Interrupt is IRQ5

S1/jumper 7

open

 

Hard Drive Interrupt is IRQ2

S1/jumper 7

closed

AT mode enabled

S1/jumper 8

closed

 

XT mode enabled

S1/jumper 8

open

BIOS DRIVE TYPE TABLE

Type #

Formatted Capacity

Heads

Physical/Logical Cylinders

0

65MB

5

981/1023

1

92MB

7

987/1023

2

33MB

4

612/935

3

33MB

4

615/940

TRANSLATION CONFIGURATION - S1 & W9

SPT

BIOS

Translate

Dynamic

Configuration

RLL BIOS

Type

S1

Jumper 5

S1

Jumper 6

W9

see above

-

Undefined

-

-

open

open

-

17

yes

no

1

closed

open

open

26

no

yes

2

open

closed

open

17

no

yes

0

closed

closed

closed

MISCELLANEOUS TECHNICAL NOTES

This controller has a built-in low-level format program. To enter the program run the DEBUG utility supplied with DOS and at the prompt enter: G=C800:5.