INS1771-1 - National Semiconductor

INS1771-1 Floppy Disk Formatter/Controller

The INS1771-1 is a programmable floppy disk formatter/ controller chip contained in a standard 40'pin dual-in· line package. The chip. which is fabricated using N-channel silicon gate technology. interfaces a floppy disk drive directly to a computer interface bus. The I NS1771-1 provides soft sector formatting. which may be either IBM 3740 compatible or a us.

Features

• Soft Sector Format Compatibility
• Automatic Track Seek with Verification
• Provisions for Miniature Floppy Disk Interface
• Read Mode Capabil ities Single/Multiple Record Read with Automatic Sector Search or Entire Track Read Selectable 128-8yte or Variable Record Length
• Write Mode Capabilities 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 Selectable Three Phase or Step and Direction and Head Positioning Motor Controls
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