ADAPTEC, INC.

AHA-2840VL, AHA-2842VL

 Data bus:                  32-bit VL-Bus

 Size:                      Full-lengh, full-height card

 Hard drive supported:      Up to seven SCSI devices

 Floppy drives supported:   Two 360KB, 720KB, 1.2MB, or 1.44MB drives

[Image]

                      CONNECTIONS

               Function                   Location

  4-pin connector - drive active LED         J1

  34-pin floppy drive connector              J2

  50-pin SCSI connector - internal           J3

  50-pin SCSI connector - external           J4

                        USER CONFIGURABLE SETTINGS

               Function
                                            Location
                                                              Setting

  »
      Floppy drive enabled
                                          S1/switch 5
                                                                off


      Floppy drive disabled
                                          S1/switch 5
                                                                 on

  »
      Host adapter BIOS enabled
                                          S1/switch 8
                                                                off


      Host adapter BIOS disabled
                                          S1/switch 8
                                                                 on

       Note: Disabling the host adapter BIOS for non-disk devices such as
       CD-ROM drives, tape drives, will reduce boot up time.

                           I/O ADDRESS SELECTION

     Address       S1/Switch 1    S1/Switch 2   S1/Switch 3   S1/Switch 4

  »     1C000h         off           off           off            off

        2C000h         on            off           off            off

        3C000h         off            on           off            off

        4C000h         on             on           off            off

        5C000h         off           off            on            off

        6C000h         on            off            on            off

        7C000h         off            on            on            off

        8C000h         on             on            on            off

        9C000h         off           off           off            on

        AC000h         on            off           off            on

        BC000h         off            on           off            on

        CC000h         on             on           off            on

        DC000h         off           off            on            on

        EC000h         on            off            on            on

       Reserved        off            on            on            on

       Reserved        on             on            on            on

           BASE ADDRESS SELECTION

    Address
                 S1/Switch 6
                               S1/Switch 7

    D8000h
                    off
                                   off

    C8000h
                     on
                                   off

    D0000h
                    off
                                   on

    E0000h
                     on
                                   on

                       MISCELLANEOUS TECHNICAL NOTES

           Only single-ended SCSI devices can be connected to the
                            AHA-2840VL/2842VL.