Western Digital WD1002A-FOX PC/XT Floppy Controller
View of the Controller.
  • J1: Floppy Drive Connector
  • J2: External Floppy Drive Connector
  • J3: Optional Power Connector
    • W1: J2 External Conn. Options (pins 2 & 3)
  • 1/2: High Density
  • 2/3: Ground Return

    • BIOS Address
    Address W2 W3
    CC00-CDFF 1/2 1/2
    CE00-CFFF 2/3 1/2
    EC00-EDFF 1/2 2/3
    EE00-EFFF 2/3 2/3

    W4: I/O Address

  • Primary (320-323): 2/3
  • Secondary (328-32B: 1/2
    • W5: Optional +5v to J2
  • 1/2: +5v to Pin #5
  • 2/3: No connection
    • W6: Optional +12v to J2
  • 1/2: +12v to Pin #1
  • 2/3: No connection
    • W7: Floppy Drive Speed Support
  • Jumpered: Dual Speed Support (300 & 360 RPM)
  • Open: Single Speed Drives Only (300 RPM)
    • W8: Chassis Ground Option
  • Jumpered: Logic Ground tied to Chassis Ground.
  • Open: Separate Logic & Chassis Grounds.
    • Switch SW1: Floppy Drive Type Selection
    Drive
    Size    		 Drive #0 Drive #1 Drive #2 Drive #3
    S1 S2 S3 S4 S5 S6 S7 S8
    360KB OFF OFF OFF OFF OFF OFF OFF OFF
    720KB ON OFF ON OFF ON OFF ON OFF
    1.2MB OFF ON OFF ON OFF ON OFF ON
    1.4MB ON ON ON ON ON ON ON ON
    Feature Sets (Options)
  • F001: Supports 2 Drives, No J2, J3, or BIOS.
  • F002: Supports 4 Drives (2-internal, 2-external), J2, J3, No BIOS.
  • F003: Supports 2 Drives, No J2, J3, or BIOS.
  • F004: Supports 4 Drives (2-internal, 2-external), J2, J3, & BIOS.
    • Support for Floppy drives above 360KB in PC & XT type computers requires the FOX BIOS (P/N: 62-000105-001). This Controller requires "Intelligent" type 1.44MB floppy drives. This type does not depend on the state of Pin #2, but determine drive type and data rate from the drive's media. Also, this Controller should not be placed in Slot J8 of an IBM PC/XT system due to the slot's modified timing & select characteristics.
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