ADAPTEC, INC.

ACB-2070A

 Data bus:                  8-bit, ISA

 Size:                      Full-length, full-height card

 Hard drives supported:     Two RLL ST506 drives

 Floppy drives supported:   None

[Image]

                            CONNECTIONS

                   Function                          Location

  20-pin data cable connector -drive 0                  J0

  20-pin data cable connector-drive 1                   J1

  34-pin control cable connector-floppy drive           J2

                           BIOS DRIVE TYPE TABLE

  Table
    #
           Hds
                   Cyls
                           MFM Cap.
                                      RLL Cap.
                                                  MN-Drive 0

                                                  QR-Drive 1
                                                               OP-Drive 0

                                                               ST Drive 1

  0
           4
                  615
                           21.41MB
                                      32.74MB
                                                  closed
                                                               closed

  1
           2
                  612
                           10.65MB
                                      16.29MB
                                                  closed
                                                               open

  2
           5
                  981
                           42.69MB
                                      65.29MB
                                                  open
                                                               closed

  3
           4
                  612
                           21.30MB
                                      32.58MB
                                                  open
                                                               open

                        USER CONFIGURABLE SETTINGS

                Function                     Location          Setting

  »   Factory configured - do not alter    AB               open

  »   Factory configured - do not alter    CD               open

  »   Drive 0 is a soft-sectored           EF               open
      ST506-type drive

      Drive 0 is a removable cartridge     EF               closed
      Syquest SQ319R

  »   Drive 1 is a soft-sectored           GH               open
      ST506-type drive

      Drive 1 is a removable cartridge     GH               closed
      Syquest SQ319R

  »   CN3 and CN2 normal setting           IJ               open

      CN2 and CN3 drive swap               IJ               closed

  »   Normal operation                     KL               open

      Self diagnostics enable              KL               closed

                       MISCELLANEOUS TECHNICAL NOTES

  If Jumper IJ is set to "closed" then the data cable connector
  assignments are swapped-
  CN2 becomes drive 1 and CN3 drive 0.

    Other drives may be attached by use of the user-definable parameters
                             through software.