The Impact of the Intel 4004 Microprocessor - Memories of the Dawn of the Personal Computer

The Moment the Magic Spark Was Lit

Today, we use what we call "super-small computers"—smartphones—as if by magic.
However, few people may realize that if you were to take apart that magic wand, you would eventually hit a tiny piece of silicon only about 3 millimeters in size.

In 1971, Intel announced a microprocessor called the "4004."

This was the beginning of everything.

Before that, computers were giant monsters that occupied entire rooms.
However, the moment this tiny chip appeared, only the "intelligence" of those monsters was condensed into a size that could fit in the palm of our hands.

Until a Collection of "Wiring" Turned into "Intelligence"

When you unravel the technical background of that time, you find a history of desperate rationalization.
Calculators until then were built by combining a vast number of electronic components like a complex puzzle to achieve specific functions.

From a hardware perspective, the greatness of the 4004 lies in its "integration capability."
It achieved a density that was considered insane at the time, packing about 2,300 transistors onto a single chip.

However, what is truly terrifying is the shift in software-based thinking.

Until then, if you wanted a computer to do a new job, you had no choice but to rebuild the circuits themselves.
However, the 4004 introduced versatility, meaning "even if the contents are the same, it can become a calculator or a traffic light controller depending on the instructions (program)."
In other words, it established a method of replacing only the soul while keeping the body fixed.

The Transition of History Born from the Calculator Wars

The fact that this invention was born not from pure academic research, but from the passion of a Japanese calculator manufacturer called "Busicom," is interesting no matter how many times you think about it.

Masatoshi Shima of Busicom was looking for more than 10 types of dedicated chips for a new calculator product.
Intel, on the other hand, pushed back, saying they didn't have the resources to make that many types.
At the end of this conflict and compromise, the counter-intuitive idea of "why not just do all the work with one type of general-purpose chip?" came to fruition.

This flow, which started with the 4004, eventually evolved into the 8080 and led to the "PC revolution" where individuals owned computers.
It was a quiet, yet decisive, paradigm shift for computers, which had been tools for the privileged class, to be handed over to the masses.

The "Impact of the 4004" That Shook the World

The impact brought about by this chip was not just that machines became smaller.

First, the rules of business were overturned from the ground up.
Until then, component manufacturers were nothing more than subcontractors for finished product manufacturers.
However, Intel took a bold gamble by buying back the external sales rights for the 4004 from Busicom. This created the winning pattern for modern tech companies, where those who control the "platform" called the CPU hold the initiative in the industry.

The surprise felt by the engineers on the front lines must have been immense.
The component before their eyes, no larger than the tip of a little finger, held the same logic as the massive computers of the past. In that 'aesthetics of density,' the young engineers of the time caught a glimpse of the possibilities of the future.

Furthermore, in terms of social significance, we would go on to experience the 'commoditization of intelligence.'
The 'power to think,' which had previously cost tens or hundreds of millions of yen, was now being lined up on the market as an inexpensive component.

At this moment, the computer took its first step in transforming from a 'special existence' into a 'transparent existence' hidden within every everyday item.

The 3mm Afterglow

Even now, at this very moment as I write this text and you read it across your screen, the direct descendants of the 4004 are repeating billions of blinks every second.

The 4004 had a processing capability of only 4 bits, which seems unreliable by today's standards.
However, I feel that the 'future of humanity' was truly inscribed upon that tiny piece of silicon.

Technology is constantly updated, but the shockwave released at that moment continues to resonate in every corner of our lives even now.
I cannot help but feel that way.

[Casual Memo] The impact of the '4-bit miracle' on the industry

The arrival of the Intel 4004 at the dawn of the personal computer era was a 'Copernican revolution' in the history of computing, going beyond the mere launch of a new product.

I will organize the impact that this '4-bit miracle' had on the industry at the time into several categories.

(1) Technical Impact: Condensation into a single chip

Until then, the CPU, which serves as the 'brain' of a computer, was composed of a massive circuit board combining numerous ICs (integrated circuits) and transistors.

・Generalization for 'calculators'
Although it was originally developed for calculators by Busicom (formerly Nippon Calculating Machine Sales), the designers, including Federico Faggin, introduced the concept of a 'general-purpose chip that runs on programs' rather than being tied to a specific application.

・Astonishing integration
Packing 2,300 transistors onto a silicon chip measuring only 3mm x 4mm was an event bordering on magic for engineers at the time.

(2) Business Model Impact: Relinquishing exclusive rights

The birth of the Intel 4004 involved a dramatic negotiation that remains in business history.

・Recovery of intellectual property rights
Because Busicom had provided the development funds, the rights to this chip originally belonged to them. However, Intel bought back the 'external sales rights' from Busicom, which had fallen into financial difficulty, on the condition of refunding the development costs.

・CPU as a "component"
　　With this, Intel transformed from an exclusive supplier for a specific manufacturer into an intelligent component manufacturer selling the "heart of a computer" to companies around the world.

(3) The Impact of Design Philosophy: From Hardware to Software

　The greatest paradigm shift brought about by the 4004 was changing the common sense that "functions are made with hardware" to "functions are defined by software."

・Simplification of logic circuits
　　It presented a method of realizing complex calculation functions not by building them with hardware circuits, but through "programs" running on a minimal circuit (the 4004).

・Reduction of development time
　　Once you had the chip, you could create different products (calculators, traffic lights, control equipment, etc.) simply by rewriting the software, which dramatically improved development efficiency.

(4) Social and Psychological Impact: Approaching the "Individual"

　The 4004 was the first step in dragging the computer down from "massive equipment" to a "tool on a desk."

・Definition of the microcomputer
　　The term "microprocessor" became established, and it served as a catalyst for opening up computer technology to people other than the elite who had previously handled mainframes (large-scale computers).

・To the 8080, and then to the PC
　　The potential of the "one-chip CPU" proven by the 4004 was passed on to the subsequent 8008 and 8080, leading directly to the homebrew computer boom of the mid-1970s (such as the Altair 8800) and, by extension, to today's PC society.

Book Introduction

・Our PC 30-Year History: Nippon PC Chronicle Kindle Edition
　Edited by SE Editorial Department
　Shoeisha (2012/12/20)
　A Japanese PC history textbook that looks back with photos. It explains the major changes in PCs over more than 30 years in two parts, using many photos and touching on social conditions to make the flow of time easy to understand. Part 1 is dedicated to explaining topics by era, incorporating "testimonies (turning points)" from developers and related parties of the time to reveal behind-the-scenes stories of development. Part 2 summarizes PC architecture and other topics by theme.
( * Book descriptions, etc., are generally based on the descriptions at the link (Amazon). Please refer to the link for detailed content.)

*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-