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ST21M, ST21R

SEAGATE TECHNOLOGY INC.

ST21M, ST21R

Data bus: 16-bit, ISA

Size: Half-length, full-height card

Hard drives supported: Two MFM ST506/ST412 drives (ST21M)

Two RLL ST412 drives (ST21R)

Floppy drives supported: None

CONNECTIONS

Function

Location

34-pin control cable connector-hard drive

J2

20-pin data cable connector-drive 1

J3

20-pin data cable connector-drive 0

J4

4-pin connector-drive active LED

J5

5-pin connector-DC power

J6

BIOS ENABLE

Function

Location

Setting

BIOS enabled

JP3

open

 

BIOS disabled

JP3

closed

I/O AND BIOS ADDRESS

Hard/Floppy Drive Address

BIOS Addresss

JP1

JP2

1F0-1F7/3F6-3F7h

C8000-CBFFFh

open

open

1F0-1F7/3F6-3F7h

CC000-CFFFFh

open

closed

170-177/376-377h

D8000-DBFFFh

closed

open

170-177/376-377h

DC000-DFFFFh

closed

closed

DRIVE PARAMETERS SUPPORTED BY THE ST21M

Capacity

Heads

Cylinder

SPT

21.4

4

615

17

32.1

6

615

17

42.5

5

977

17

42.8

6

820

17

44.5

5

1024

17

80.2

9

1024

17

83.9

9

1072

17

DRIVE PARAMETERS SUPPORTED BY THE ST21R

Capacity

Heads

Cylinder

SPT

21.17

2

667

31

32.7

4

615

26

42.9

4

667

31

49.1

6

615

26

65.5

6

820

26

122.7

9

1024

26

128.4

9

1072

26