
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.

