Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.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 Coupe, as well as the +D and DISCiPLE disk interfaces for the Sinclair ZX Spectrum and the Commodore 1581 for the Commodore 64.

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