FD1791B

IIVESTERIV DIGITAL CDR PO RAT /0 N FD1791A/B Floppy Disk Formatter/Controller FEATURES SOFT SECTOR FORMAT COMPATIBILITY AUTOMATIC TRACK SEEK WITH VERIFI- CATION ACCOMMODATES SINGLE AND DOUBLE DENSITY FORMATS IBM 3740 Single Density (FM) IBM System 34 Double Density (MFM) READ MODE Single/Multiple Record Read with Automatic Search or Entire Track Read Selectable 128 Byte or Variable Length Record WRITE MODE Single/Multiple Record Write with Automatic Sector Search Entire Track Write for Diskette Initialization PROGRAMMABLE CONTROLS Selectable Track to Track Stepping Time Selectable Head Settling and Head Engage Times SYSTEM COMPATIBILITY Double Buffering of Data 8 Bit Bi-Directional Bus for Data, Control and Status D~A or Programmed Data Transfers All Inputs and Outputs are TTL Compatible On-chip Track and Sector Registers Comprehensive Status Information WRITE PRECOMPENSATION (MFM AND FM) WINDOW EXTENSION (IN MFM) INCORPORATES ENCODING/DECODING ...