Always IN-2000 SCSI Controller
View of Controller.
  • J1: Drive Power Connector (not used)
  • J2: Floppy Drive Connector
  • J3: Hard Drive Activity LED Connector
  • J4: Internal SCSI Hard Drive Connector
  • J5: External SCSI Hard Drive Connector
  • F1: Fuse, 125v, 2a
    • Default settings are in Bold or are selected by a .
    SW1: Options
    (1,2): BIOS Address
    -1- -2-
    C800-CBFF Off Off
    D000-D3FF Off On
    D800-DBFF On Off
    Disable On On
    (Default is C800).

    (3,4): Port Address
    -3- -4-
    220-22F Off Off
    200-20F On Off
    110-11F Off On
    100-10F On On
    (Default is 220).

    (5-7): Interrupt Select
    -5- -6- -7-
    IRQ#15 Off Off Off
    IRQ#14 Off On Off
    IRQ#11 Off Off On
    IRQ#10 Off On On
    Disable On N/A N/A
    DOS 5.0 On On On
    (Default is IRQ#15).

    (8): Synchronous Operation

  • Open for Asynchronous Operation.
  • Jumpered for Synchronous Operation.
    • (9): Floppy Controller
  • Open to Disable Floppy support.
  • Jumpered to Enable Floppy support.

    • (10): (Not Used)

    The IN-2000 contains Low Level Formatter and Diagnostics routines in it's BIOS. They're accessed using the Debug command, and reside at offsets :5 & :8 respectively. (For an address of c800, use g=c800:5 & g=c800:8)

    For DOS 5.0 & above, setting the interrupts to "DOS 5.0 support" will allow support for up to seven (7) Hard Drives w/o requiring software drivers. (CDRoms and Tape Drives will still require special drivers.)

    While there are OEM drivers for most Operating Systems, third-party drivers are also available from Columbia Data Products.

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