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UPD765AC2

Single/Double Density Floppy-Disk Controller; Address mark detection circuitry is internal to the FDC which simplifies the phase-locked loop and read electronics. The track stepping rate, head load time, and head unload time are user-programmable. The uPD765A/uPD765B offers additional features such as multi-track and multi-side read and write commands and single and double density capabilities.\n\nFM, MFM Control\nVariable recording length: 128,256, .8192 bytes/sector\nIBM-compatible format (single- and double sided, single- and double-density)\nMulti-sector and multi-track transfer capability\nDrive up to 4 floppy or micro floppydisk drives\nData scan capability-will scan a single sector or an entire cylinder comparing byte-for-byte host memory and disk data\nData transfers in DMA or non-DMA mode\nParallel seek operations on up to four drives\nCompatible with uPD8080/85, uPD8086/88, V-series and uPD780 (Z80@) microprocessors\nSingle-phase clock: 8 MHz maximum 3 +5V only\n\n?;

Description\nThe uPD765A/B is an LSI floppy disk controller (FDC) chip which contains the circuitry and control functions for interfacing a processor to 4 floppy disk drives. It is capableof either IBM 3740 single density format (FM), or IBM System 34 double density format (MFM) including double-sided recording. The uPD765A/B provides control signals which simplify the design of an external\nphase-locked loop and write precompensation circuitry. The FDC simplifies and handles most of the burdens as sociated with implementing a floppy disk interface.