AMERICAN MEGATRENDS, INC.

FAST DISK VLB

 Data bus:                32-bit, VL-bus

 Size:                    Three/quarter-length, full-height card

 Hard drive supported:    Up to seven SCSI devices

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

[Image]

                            CONNECTIONS

                   Function                          Location

  4-pin connector-Drive active LED                      J1

  20-pin factory test connector                         J2

  34-pin control cable connector-floppy drive           J3

  50-pin SCSI connector - internal                      J4

  50-pin SCSI connector - external                      J6

                        USER CONFIGURABLE SETTINGS

               Function
                                            Location
                                                               Setting

  »
      SCSI termination enabled
                                               J8
                                                               closed


      SCSI termination disabled
                                               J8
                                                                open

  »
      Local Bus speed < 50MHz
                                              J11
                                                              pins 2 & 3
                                                               closed


      Local Bus speed > 50MHz
                                              J11
                                                              pins 1 & 2
                                                               closed

  »
      ISA mode enabled
                                          SW1/switch 6
                                                                 off


      EISA mode enabled
                                          SW1/switch 6
                                                                 on

  »
      Hard drive capacity > 1GB
      disabled
                                          SW2/switch 1
                                                                 off


      Hard drive capacity > 1GB
      enabled
                                          SW2/switch 1
                                                                 on

  »
      Cache memory enabled
                                          SW2/switch 2
                                                                 off


      Cache memory disabled
                                          SW2/switch 2
                                                                 on

  »
      Single-sector commands
      separate caching disabled
                                          SW2/switch 3
                                                                 off


      Single-sector commands
      separate caching enabled
                                          SW2/switch 3
                                                                 on

  »
      Caching for removable drives
      disabled
                                          SW2/switch 4
                                                                 off


      Caching for removable drives
      enabled
                                          SW2/switch 4
                                                                 on

                        USER CONFIGURABLE SETTINGS

               Function                     Location           Setting

  »   Delayed write caching enabled       SW2/switch 5           off

      Write-through caching enabled       SW2/switch 5           on

  »   SCSI autoselection time-out         SW2/switch 6           off
      enabled

      SCSI autoselection time-out         SW2/switch 6           on
      disabled

  »   SCSI synchronous negotiation        SW3/switch 4           off
      enabled

      SCSI synchronous negotiation        SW3/switch 4           on
      disabled

  »   SCSI 10MB/sec data transfer         SW3/switch 5           off
      rate enabled

      SCSI 5MB/sec data transfer rate     SW3/switch 5           on
      enabled

  »   Adaptec 154x-type target            SW3/switch 6           off
      allocation disabled

      Adaptec 154x-type target            SW3/switch 6           on
      allocation enabled

  »   32-bit operation (Extended          SW3/switch 7           off
      Mode) enabled

      32-bit operation (Extended          SW3/switch 7           on
      Mode) disabled

  »   Support for 7 drives (DOS 5.0       SW3/switch 8           off
      and later) enabled

      Support for 7 drives (DOS 5.0       SW3/switch 8           on
      and later) disabled

  »   Floppy drive enabled                SW5/switch 1           on

      Floppy drive disabled               SW5/switch 1           off

  »   Normal operation enabled            SW5/switch 2           off

      Diagnostic mode enabled             SW5/switch 2           on

                       SCSI HOST ADAPTER SLOT NUMBER

   Slot Number
                    SW1/switch 1
                                        SW1/switch 2
                                                           SW1/switch 3

  »
          1
                         off
                                            off
                                                               off


          2
                         on
                                            off
                                                               off


          3
                         off
                                             on
                                                               off


          4
                         on
                                             on
                                                               off


          5
                         off
                                            off
                                                                on


          6
                         on
                                            off
                                                                on


          7
                         off
                                             on
                                                                on


          8
                         on
                                             on
                                                                on

                      MOTHERBOARD SPEED CONFIGURATION

          Speed                 SW1/switch 4            SW1/switch 5

         20 or 25MHz                off                      off

  »      33 or 40MHz                 on                      off

            50MHz                   off                      on

                             I/O PORT ADDRESS

       Address
                       SW3/switch 1
                                         SW3/switch 2
                                                           SW3/switch 3


        130-133h
                            on
                                              off
                                                                off


        134-137h
                            on
                                              off
                                                                on


        230-233h
                            off
                                              on
                                                                off


        234-237h
                            off
                                              on
                                                                on

  »
        330-333h
                            off
                                              off
                                                                off


        334-337h
                            off
                                              off
                                                                on

                         DMA CHANNEL CONFIGURATION

        DMA Channel              SW4/switch 1            SW4/switch 2

  »            5                     off                     off

               6                      on                     off

               7                     off                      on

       No Channel selected            on                      on

                     INRTERRUPT REQUEST CONFIGURATION

      IRQ
                    SW4/switch 3
                                       SW4/switch 4
                                                           SW4/switch 5


          9
                         on
                                            off
                                                               off


         10
                        off
                                            on
                                                               off

  »
         11
                        off
                                            off
                                                               off


         12
                         on
                                            on
                                                               off


         14
                        off
                                            off
                                                                on


         15
                         on
                                            off
                                                                on

                               BIOS ADDRESS

       Address         SW4/switch 6      SW4/switch 7      SW4/switch 8

  »      C8000h             off               off               off

         D8000h             on                off               off

         D4000h             off               on                off

         D0000h             on                on                off

         CC000h             off               off               on

         DC000h             on                off               on

        Disabled            off               on                on

        Disabled            on                on                on

                  MISCELLANEOUS TECHNICAL NOTES

  J5 is factory configured in the closed position - do not alter