Intel P8255A-5 Programmable Peripheral Interface IC 5MHz DIP-40 Used Pull

Intel P8255A-5 5MHz Programmable Peripheral Interface IC 40-Pin DIP

Condition

Used equipment pull. Markings legible: P8255A-5, lot L3352199, INTEL ©1975. Pins are intact in standard 40-pin DIP configuration. Evaluation: Visual inspection only. Function testing not performed.

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Product Overview

The Intel P8255A-5 is a general-purpose Programmable Peripheral Interface (PPI) designed for parallel I/O expansion in microprocessor systems. Operating at up to 5 MHz bus clock rates, this 40-pin NMOS device provides 24 programmable input/output pins configurable into three 8-bit ports. Direct TTL logic compatibility and flexible operating modes make it a standard interface component for vintage computing platforms, industrial controllers, and retro computing hardware builds.

Key Features

• 24 programmable I/O pins configured as three 8-bit ports (Port A, Port B, Port C)
• 5 MHz rated bus timing compatibility (-5 speed grade)
• Three operating modes: Mode 0 (Basic I/O), Mode 1 (Strobed I/O), and Mode 2 (Bidirectional Bus)
• Direct TTL compatibility across all inputs and outputs
• Standard 40-pin dual in-line package (DIP-40) with 0.600-inch row spacing
• Single +5V power supply operation

Applications

• Restoring and servicing legacy 8080, 8085, Z80, and x86 microprocessor control boards
• Expanding parallel I/O lines on vintage single-board computers and classic arcade systems
• Prototyping custom 8-bit retro computing interfaces and breadboard peripheral circuits

Frequently Asked Questions

What is the difference between the standard 8255A and the P8255A-5?

The P8255A-5 features faster bus timing rated for operation up to 5 MHz, compared to the standard 8255A base speed rating. The plastic DIP packaging carries the standard 40-pin layout.

Can this IC interface directly with 5V TTL logic?

Yes. The P8255A-5 operates on a single +5V DC supply and features direct TTL-compatible voltage levels on all input and output pins.

Why buy an individual identified pull rather than an unverified bulk lot?

When servicing vintage computing equipment, securing an individual component with intact pins and clear markings eliminates the guesswork of sorting through unknown surplus lots. Orders ship for an $8 flat rate, qualify for free shipping at $28, and depart our Idaho warehouse the same or next business day.

Vintage parallel logic from the golden age of computing, ready to handle bus traffic and put classic hardware back in service.