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

[Image]

                           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        BIOS Addresss         JP1           JP2
         Address

     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