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

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