2Pcs EF6821P MC6821P 6821 PIA Peripheral Interface Adapter IC DIP-40

2Pcs EF6821P MC6821P 6821 PIA Peripheral Interface Adapter IC DIP-40 The EF6821P (also known as MC6821P or 6821) is a widely used PIA (Peripheral Interface Adapter) IC, designed to interface microprocessors with external peripheral devices. It provides two 8‑bit bidirectional I/O ports (16 I/O lines) and 4 interrupt lines, fully programmable for input/output modes and interrupt control. Packaged in a DIP‑40 through‑hole format, it is easy to integrate into legacy systems, industrial controllers, and retro computer projects. Operating at 5V DC. This lot include 2 pieces of EF6821P, perfect for replacement, repair, or electronic DIY applications requiring parallel I/O expansion.

• Integrated PIA (Peripheral Interface Adapter) with two independent 8‑bit bidirectional I/O ports (16 I/O lines total), each configurable as input or output for flexible peripheral connection.
• Comes in classic 40‑pin plastic dual in‑line package (DIP‑40), 2.54mm pin pitch, easy for manual soldering and breadboard prototyping.
• Works with 5V DC power supply; compatible with 6800/6801/6803/6805/6809/68HC11 and other MPUs, ideal for retro computing and industrial control systems.
• Features 4 individually controlled interrupt input lines, programmable control registers, and handshake logic for reliable data transfer and real‑time peripheral management.
• Equivalent replacement for MC6821P/6821.