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CONNECTIONS

Function

Location

34-pin control cable connector-hard drive

J2

20-pin data cable connector-drive 0

J3

20-pin data cable connector-drive 1

J4

5-pin connector-DC power

J5

BIOS & I/O PORT ADDRESS

BIOS Address

I/O Port Address

JP1

JP1A

C800h

320-323h

open

open

D000h

324-327h

closed

open

D800h

328-32Bh

open

closed

E000h (XT only)

32C-32Fh

closed

closed

ST11M SUPPORTED DISK PARAMETERS

Capacity

Heads

Cylinders

Sectors

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

ST11R SUPPORTED DISK PARAMETERS

Capacity

Heads

Cylinders

Sectors

32.7

4

615

26

49.1

6

615

26

21.1

2

667

31

32.7

4

615

26

42.9

4

667

31

65.5

6

820

26

122.7

9

1024

26

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. If the error BAD DRIVE!(4) comes up during low-level the controller will stop the format and exit. This is a bug in the controller that causes it to halt on bad sectors that are not flagged in the bad track table. In no way does this mean you have a bad drive! Simply write down the head and cylinder at the point the controller stopped, start the low-level over again and add this to the bad track table. (You must watch closely to catch the head and cylinder; the screen is cleared right after the error is hit.) If it still returns a BAD DRIVE!(4) message on the same head and cylinder, then enter the head and cylinder into the bad track table twice. Once with the actual BFI and once with a BFI 2000 numbers apart from the first. The ST11R is one of the only 8-bit controllers that support 31 sectors per track. The Seagate ST225R hard drive uses 31 sectors per track and thus must use this controller not a regular 26 sectors per track RLL controller.