Find great deals for Da Floppy Disk Controller/formatter FDC Intel pin CERDIP (p) – 1pcs. Shop with confidence on eBay!. Do to differences in floppy disk controllers, I would like to focus on the original A Floppy Disk Controller. The image at the beginning of this chapter shows a. A floppy disk controller (FDC) is an electronic chip controller used as an interface between a computer and a floppy disk drive. Modern computers have this chip.

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This bit is set only during the execution phase in non-DMA mode. Transition to “0” state indicates execution phase has ended. Indicates Data Register is ready to send or receive conttroller to or from the processor. Both bits DIO and RQM should be used to perform the handshaking functions of “ready” and “direction” to the processor.


Write precompensation status during MFM mode. Determines early, late and normal times. Head 1 selected when “1” high. Head controlled selected when “0” low.

Operating Systems Development Series

Must be enabled for all operations, both Read and Write. After completion of the operation, status and other housekeeping information are made available to the processor. When N is defined as 00, DTL stands for the data conyroller which users are going to read out or write into the sector. HUT stands for the head unload time after a read or write operation has occured 16 to ms in 16ms increments.

Desired Position of head. Position of head at present time. ST stand for one of four registers which store the status information after a command has been executed.

This information is available during the result phase after command execution. ST may be read only after a command has been executed and contain information relevant to that particular command.


Floppy-disk controller – Wikipedia

When the FDD is in the not-ready state and a read or write command is issued, this flag is set. If a read or write command is issued to Side 1 of a single sided drive then this flag is set. If the FDC is not serviced by the main systems during data transfers within a certain time interval, this flag is set. This bit is related with the ND bit, and when the contents of C on the medium is different from that stored in the IDR, this flag is set.

During execution, the SCAN Command, if the condition of the “equal” is satisfied, then this flag is set.

Last modified: June 24, 2020