Western Digital FD1771

Western Digital datasheet for the FD1771 floppy disk controller

The FD1771 is the first in a line of floppy disk controllers produced by Western Digital. It uses single density (FM) modulation and supports the IBM 3740 disk format. It is packaged in a 40-pin DIP.[1][2]

Derivatives

The FD1771 was succeeded by many derivatives that were mostly software-compatible:

Compatible chips

Many compatible chips were available from other vendors:

These families were used in many microcomputers and home computers including the Radio Shack TRS-80, Acorn Electron, BBC Master, Atari ST, Acorn Archimedes and the SAM Coupé, as well as the +D and DISCiPLE disk interfaces for the Sinclair ZX Spectrum, the Commodore 157x/1581 for the Commodore 64 and the Atari XF551 for the Atari XL/XE.

References

  1. Michalopoulos, Demetrios A (October 1976). "New Products: Single-chip floppy disk formatter/controller". Computer (IEEE) 9 (10): 64. doi:10.1109/C-M.1976.218414."The FD1771 is a single-chip floppy disk formatter/controller that interfaces with most available disk drives and virtually all types of computers."
  2. "Recent IC Announcements". Computer (IEEE) 9 (10): 66. October 1976. doi:10.1109/C-M.1976.218417. The FD1771 was announced on July 19, 1976, and sold for $60 each in lots of 100.
  3. "Recent IC Announcements". Computer (IEEE) 10 (12): 140. December 1977. doi:10.1109/C-M.1977.217618. The FD1781 was announced on September 21, 1977. Supported Dual density; accommodates MFM, M2FM.
  4. "Dual Density Floppy Controller Chip". Byte 3 (3): 216. March 1978.
  5. FD 179X-02 datasheet
  6. WD279X-02 datasheet
  7. WD177X-00 datasheet images
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