Storage Research SR-9 / Tega Technologies SM911 SCSI Controller
View of the Controller.
  • J1: External SCSI Drive Connector
  • J2: Internal SCSI Drive Connector
  • J3: Floppy Drive Connector
  • JP1: SCSI Activity LED Connector
    • Default settings are in Bold or are selected by a .
    JP3(1-4): BIOS Address
    Range (1/3) (2/4)
    C800:0000-C800:1FFF Off On
    CA00:0000-CA00:1FFF Off Off
    CE00:0000-CE00:1FFF On Off
    DE00:0000-DE00:1FFF On On
    (Default is CA00.)

    JP7: Zero Wait State

  • Jumpered to Enable ZWS Support (AT Class Computers only).
  • Open to Disable ZWS Support.
    • JP8(1-3): Interrupt
    (1/2) (2/3)
    IRQ#3 On Off
    IRQ#5 Off On
    Disable Off Off
    (Default is IRQ#3.)
    Though the Zero Wait State function can speed-up this Host Adapter, some AT class computers do not implement it's function correctly. Use of the ZWS will allow 1:1 interleaves on AT class computers. If use of the ZWS function causes hangs on boot, remove the jumper, and reset the drive to 2:1 interleave with a Low Level Format.

    If IRQ 3 or 5 causes conflicts with equipment, you may run the SR-9/SM911 with the Interrupts disabled.

    The SR-9/SM911 does not contain a Low Level Format routine in it's BIOS. It requires the use of a separate LLF program. Disk Maestro, by Future Domain, is usually shipped with this controller. (The SR-9/SM911 utilizes a Future Domain SCSI interface IC. and a "generic" FD SCSI BIOS)

    This SCSI Host Adapter started life as the Tega Technologies SM911, and was later renamed SR-9 when the Company changed it's name to Storage Research. Original Tega controllers had the model number "144N44" on them, but I've never seen the card advertised under that model number.

    The Floppy drive controller will NOT support dual-speed drives.

    The External SCSI Connector uses the early Future Domain pinout, NOT the more common Apple type pinout.

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