WESTERN DIGITAL CORPORATION

WDXT-GEN2, WDXT-GEN2 PLUS, WDXT-GEN2R

Data bus: 8-bit, PC/XT

Size: Half-length, full-height card

Hard drives supported: Two MFM ST506/412 drives (WDXT-GEN2/GEN2 PLUS)

Two RLL ST506/412 drives (WDXT-GEN2R)

Floppy drives supported: None

Maximum heads/cyl.: Maximum 8 heads and 1024 cylinders (WDXT-GEN2/GEN2 PLUS)

Maximum 15 heads and 1024 cylinders (WDXT-GEN2R)

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 connector-DC power (optional)

J4

4-pin connector-drive active LED

J5

SECTORS AND CONFIGURATION OPTIONS FOR RLL TABLE (WDXT-GEN2R)

Sectors

Translation

Dynamic

R25

R26

»

17

yes

no

closed

open

»

26

no

yes

open

closed

USER CONFIGURABLE SETTINGS

Function

Location

Setting

»

Internal BIOS selected

R23

open

»

External BIOS selected

R23

closed

»

Factory configured - do not alter (WDXT-GEN2/GEN2 PLUS)

R25

open

»

Factory configured - do not alter (WDXT-GEN2/GEN2 PLUS)

R26

open

»

IRQ5 select

R27

open

»

IRQ2 select

R27

closed

»

XT mode enabled

R28

open

»

XT mode disabled

R28

closed

DRIVE TYPE CONFIGURATION (WDXT-GEN2/GEN2 PLUS)

 

Drive 0

Drive 1

     
 

Table #

R17

R18

R19

R20

Capacity

Heads

Cyls.

»

3

open

open

open

open

21MB

4

615

 

0

closed

closed

closed

closed

21MB

4

612

 

1

open

closed

open

closed

10MB

4

306

 

2

closed

open

closed

open

10MB

2

615

DRIVE TYPE CONFIGURATION (WDXT-GEN2R)

 

Drive 0

Drive 1

     
 

Table #

R17

R18

R19

R20

Capacity

Heads

Cyls.

»

3

open

open

open

open

32MB

4

615

 

0

closed

closed

closed

closed

65MB

6

820

 

1

open

closed

open

closed

42MB

4

782

 

2

closed

open

closed

open

21MB

2

782

ADDRESS SELECTION

Controller Address

BIOS Address

R21

R22

»

320-323h

C8000-C9FFFh

open

open

 

324-327h

CA000-CBFFFh

closed

open

 

328-32Bh

CC000-CDFFFh

open

closed

 

32C-32Fh

CE000-CFFFFh

closed

closed

MISCELLANEOUS TECHNICAL NOTES

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