How Steve Wozniak Single‑Handedly Built the First Complete Computer System (Apple I)

Computers are complex systems involving CPU, memory, compilers, operating systems, and more, raising the question of whether a single person could handle an entire computer system.

The answer is yes; as early as 1976, Steve Wozniak built a complete computer system from hardware to software by himself.

Wozniak’s creation, later known as the Apple I, was a fully functional machine that combined a ready‑made processor with custom software.

Inspired by the Homebrew Computer Club’s first meeting on March 5 1975 in Gordon French’s garage, Wozniak immediately began designing his own system.

Without modern tools like GitHub or Google, he single‑handedly completed the entire system and demonstrated it at the club, even helping other members build their own computers.

Partnering with Steve Jobs, who acted as the product manager, they sold the circuit boards; Jobs sold his car and Wozniak sold his HP‑65 calculator to fund the new company, leading to the launch of the Apple I.

The Apple I used a Motorola 6800 processor, 4 KB of memory, a BASIC interpreter written by Wozniak, and a machine‑language monitor (a primitive operating system) that allowed hex programming, code inspection, and execution at specific addresses.

The monitor ran in a 256‑byte memory area and functioned like an early shell, providing low‑level control over the machine.

In July 1976, the Apple I was sold for $666.66, a price chosen by Wozniak for its repetitive digits, and after a year it was succeeded by the Apple II, which propelled Apple to worldwide fame.

Decades later, Apple’s revolutionary iPhone cemented its status as the world’s most valuable company.

The article emphasizes that even in the 1970s, building a commercial processor required more than a single individual, and modern computer systems are assembled from existing hardware and software components, much like building with LEGO bricks.