Data Technology DTC-7280 MFM Controller
(Please use your imagination here.)
  • J1: Floppy Drive Connector.
  • J2: Hard Drive Control Connector.
  • J3: Hard Drive #0 Data Connector.
  • J4: Hard Drive #1 Data Connector.
  • J5: Hard Drive LED Connector.
    • Default settings are in Bold or are selected by a .
    W2,W3: I/O Port Addresses
  • Both Open for Primary Addresses (1F0-1F7, 3F0-3F7).
  • Both Jumpered for Secondary Address (170-177, 370-377).

    • W4: Floppy Drive Transfer Rate

  • Open for 500Khz.
  • Jumpered for 250Khz.

    • W5: Drive Select Mode Type

  • Jumpered for Hardware Select Mode.
  • Open for Firmware Select Mode.

    • W6: Auto-Deselect Mode

  • Jumpered for Enabled.
  • Open for Disabled.

    • W7: Floppy Precompensation

  • Jumpered for single Precomp. at 125ns.
  • Open for Scaled Precomp:
  • 125ns@500Khz.
  • 208ns@300Khz.
  • 250ns@250Khz.
    • The DTC-7280 is a 1:1 Interleave MFM Controller. It will run at zero wait states up to a bus speed of 16Mhz. It does not have an embedded Low Level Format routine, and requires the IBM AT Advanced Diagnostics©, or similar 3rd party software for a Low Level Format.
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