Bing found these results
MCS-51 - Wikipedia
Introduction to 8051 Microcontroller - GeeksforGeeks
8051 Microcontroller Introduction and Basics - Electronics Hub
8051 Microcontroller - Tutorial and Guide - CircuitsToday
Explore Intel’s history- The 8051 Microcontroller
8051 Microcontroller Architecture - Electronics Hub
Embedded Systems/8051 Microcontroller - Wikibooks
Microcontrollers - 8051 Architecture - Online Tutorials Library
8051 Architecture - In-depth explanation using old and modern …
A History of Early Microcontrollers, Part 8: The Intel 8051