SEAGATE TECHNOLOGY, INC.

ST11M, ST11R

Data bus: 8-bit, ISA

Size: Half-length, full-height card

Hard drives supported: ST11M: Two MFM ST506/412 drives

ST11R: Two RLL ST506/412 drives

Floppy drives supported: None

[Image]

                           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         32C-32Fh          closed            closed
          only)

          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.