Seagate ST07a / ST08a ATA Host Adapter
View of Controller
  • J1: Hard Drive Connector
  • J2: Floppy Drive Connector (ST08a only)
  • J3: HD Activity LED Connector
  • J4: Aux. HD Power Connector
  • J6: Hard Drive LED
    • Default settings are in Bold or are selected by a .
    JP2: I/O Address Selection
    HD (ST07a/ST08a) FD (ST08a Only)
    Off 1F0-1F7, 3F6-3F7 3F0-3F5, 3F7
    On 170-177, 376-377 370-375, 377
    (Default is Off)

    JP4: Floppy Drive Enable (ST08a Only)

  • Jumper to Enable Floppy Support.
  • Open to Disable Floppy Support.

    • JP5: Disable Interrupt While Busy

  • (2/3): HD IRQ connected to IRQ#14.
  • (1/2): IRQ#14 cleared while the Hard Disk is busy.

    • JP6: I/O Channel Ready

  • Open to Disconnect I/O Ch. Rdy. from Host.
  • Jumpered to Connect I/O Ch. Rdy. to Host.

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