How Wang An Invented the Magnetic Pulse Memory Core

A 1949 invention by An Wang that used magnetic cores to store and transfer binary data, forming the backbone of early computer memory.

What it covers

This device uses magnetic cores to control the transfer of electrical pulses. It functions as a memory element by shifting information from one magnetic state to another. By applying specific current pulses, the device can store a bit of data as a magnetic orientation and then transfer that state to the next element in a sequence. This mechanism allowed early computers to store and move data without relying on fragile vacuum tubes.

What it doesn't cover

• —Does not cover semiconductor-based RAM or flash memory storage.
• —Does not cover optical data storage or laser-based reading methods.
• —Does not cover software-based data processing algorithms.

The clever bit

It solved the problem of how to move data bits through a system without them getting lost or corrupted, using the physical property of magnetic hysteresis to hold a state indefinitely.

Why it matters

This invention was fundamental to the development of reliable digital computers. Before this, memory was bulky and prone to failure. An Wang's work enabled the creation of magnetic core memory, which was the standard for high-speed computer storage from the 1950s through the 1970s.

Real-world examples

• 1.Magnetic core memory modules in 1960s mainframe computers
• 2.Early digital calculators
• 3.Control systems for the Apollo Guidance Computer