8272 controller equivalent, single / double density floppy disk controller.
Address mark detection curcuitry is internal to the FDC which simplifies the phase locked loop and read electronics. The track stepping rate, head load time, and head unl.
Hand-shaking signals are provided in the 8272 which make DMA operation easy to incorporate with the aid of an external DMA controller chip, such as the 8237. The FDC will operate in either DMA or Non-DMA mode. In the Non-DMA mode, the FDC generates i.
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