WD1770
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The WD1770 is the first in a line of floppy disk controllers produced by Western Digital. It uses the IBM 360 disc format and supports single density (FM) or double density (MFM) operation.
A number of compatible chips were available, such as those from the VL177x family (produced by VLSI Technology).
These families were used with the Acorn Electron, BBC Master, Atari ST, Acorn Archimedes and Commodore 1581 and the SAM Coupé, as well as the +D and DISCiPLE disk interfaces for the ZX Spectrum.
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