The FDC is responsible for reading data presented from the host computer and converting it to the drive's on-disk format using one of a number of encoding schemes, like FM encoding (single density) or MFM encoding (double density), and reading those formats and returning it to its original binary values.ĭepending on the platform, data transfers between the controller and host computer would be controlled by the computer's own microprocessor, or an inexpensive dedicated microprocessor like the MOS 6507 or Zilog Z80. An FDC directs and controls reading from and writing to a computer's floppy disk drive (FDD). The NEC D765AC FDC IC is the large dual in-line package at the top.Ī floppy-disk controller ( FDC) has evolved from a discrete set of components on one or more circuit boards to a special-purpose integrated circuit (IC or "chip") or a component thereof. For the logic, see 3-state.įDC board from an IBM 5150.
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