uPD765-Japan

uPD765C is a widely used LSI Floppy Disk Controller (FDC) chip developed by NEC. It was the industry-standard controller for floppy drives in the 1980s, enabling IBM-compatible format, single and double density recording (FM/MFM), and supporting up to four drives.

Key Technical Details & Features

• Manufacturer: NEC (often found as NEC Electronics Group).
• Type: LSI Floppy Disk Controller (FDC).
• Interface Capabilities:
  • Compatible with up to 4 floppy or micro-floppy drives.
  • Supports both single-density (FM) and double-density (MFM) formats.
  • Supports single-sided and double-sided recording.
  • IBM 3740 (single density) and IBM System 34 (double density) compatible.
• Operating Modes: Supports both Direct Memory Access (DMA) and non-DMA (interrupt-driven) modes.
• Performance: Maximum 8 MHz clock rate.
• Microprocessor Compatibility: Designed for use with Intel 8080/8085, 8086/8088, V-series, and Zilog Z80.
• Power Requirements: +5V DC only.
• Package: Commonly found in a 40-pin Plastic DIP (Dual In-line Package).

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