By 1983, Acorn's engineering team was planning its next-generation desktop computer, a machine that could replace the BBC Micro and compete with emerging business desktop computers from IBM and Apple. But the 8-bit 6502 processor that powered the BBC Micro was reaching its absolute physical limit. It operated at a clock speed of just 2 MHz, capable of addressing only 64 kilobytes of memory without complex memory bank switching. Acorn evaluated the next generation of 16-bit and 32-bit commercial processors available on the global market, including Motorola's 68000 and Intel's 802A6. But the Cambridge team found these foreign chips complex, expensive, slow to execute certain instructions, and demanding in their power consumption. None of them offered the fluid, instantaneous response that Acorn's chief architects demanded for their new operating system concepts.

Acorn had built a national computer empire on existing off-the-shelf silicon. But to build the classroom and office computer of the future, a small team of Cambridge engineers realized they would first have to do something almost unheard of for a modest British desktop manufacturer. They would have to design their own 32-bit microchip from scratch. In late 1983, inside Acorn's research facility on Market Hill in Cambridge, the engineering team faced an inescapable architectural wall.

Designing the ARM I

The company was led technical-wise by Sophie Wilson, a brilliant computer scientist who had written BBC Basic, and Steve Ferber, a gifted hardware engineer who had designed the internal electronics of the BBC Micro. Together they were tasked with defining the silicon architecture for Acorn's next decade. To build a modern computer capable of running complex graphic interfaces and advanced software, Acorn needed a 32-bit processor, a microprocessor capable of processing data in 32-bit memory blocks rather than the restrictive 8-bit blocks of the previous era. They systematically evaluated the commercial chips offered by major American semiconductor manufacturers, including Motorola's 68000 and Intel's 802.86. What they found dismayed them. These chips were built on CISC architecture, complex instruction set computing, a chip design philosophy where processors rely on large, intricate sets of built-in commands. Because each complex command required multiple clock cycles to execute, the chips were physically large, generated significant heat, required expensive support circuitry, and ran far too slowly for the fluid computing experience Acorn wanted to deliver.

The breakthrough came when Herman Hauser handed Wilson and Ferber academic papers published by the University of California, Berkeley, and Stanford University. Researchers like David Patterson were championing an alternative philosophy, RISC, Reduced Instruction Set Computer. RISC theory argued that instead of overloading a processor with hundreds of complex, rarely used commands, a chip should use a small, highly streamlined set of simple instructions. By making every instruction simple enough to execute in a single clock cycle, one beat of the chip's internal electronic timer, a RISC processor could achieve unprecedented execution speeds while using a fraction of the decision. Unable to afford the tens of millions of pounds and hundreds of engineers that American chip firms poured into mainframe-driven computer design, Acorn assigned a core team of just four engineers to design a proprietary 32-bit RISC chip from scratch. Lacking expensive computer-aided design workstations, Wilson wrote software simulators and Ferber laid out circuit diagrams using Acorn's existing BBC microcomputers.The constraints of the British office became their greatest advantage. Because the team was small and equipped with modest design tools, they were forced to keep the chip layout exceptionally clean and simple. Instead of adding complex hardware features, they relentlessly eliminated unnecessary circuits. When the design was finalized, the instruction logic contained just 25,000 transistors, a microchip component that acts as a microscopic electronic switch to control electrical current. By comparison, Intel's competing 80286 processor contained over 130,000 transistors.

This extreme structural simplicity created two profound physical consequences. First, the tiny transistor count meant the physical silicon die, the small slice of semiconductor material containing the integrated circuit, was exceptionally small, making it remarkably cheap to manufacture. Second, fewer electronic switches meant the chip required very little electrical energy to operate. Acorn named their creation the Acorn Risk Machine, abbreviated as ARM. On 26th April 1985, the first physical samples of the ARM-1 microchip arrived at Cambridge in ceramic packages from the foundry of VLSI Technology in San Jose, California. Ferber and Wilson carefully mounted the chip into a prototype test board connected to a BBC Micro. They turned on the power. Within seconds, the screen displayed a prompt confirming the chip was active. The ARM-1 chip executed its test commands perfectly on its very first attempt, an almost unheard of triumph in microprocessor engineering. Days later, an unintended experiment revealed the chip's true nature.

ARM I - In the First Evaluation Board

ARM I - Showing Chip Description

While measuring the board's power consumption with an ammeter, an instrument that measures electrical current, engineers unplugged the main power supply cable connected to the ARM chip. To their complete astonishment, the processor did not shut down. The computer kept executing software without missing a beat. The ARM-1 was drawing so little power that it was running entirely on leakage current, small amounts of stray electrical current leaking through the computer's surrounding data lines. The chip consumed less than one-tenth of a watt. Without intending to, a small Cambridge team designing a desktop computer chip had accidentally engineered the most power-efficient 32-bit processor in human history. Acorn quickly refined the design into a commercial processor named the ARM-2 in 1987, integrating dedicated hardware for memory control and high-quality sound output. In June 1987, Acorn launched its new flagship computer line, the Acorn Archimedes. The Archimedes was a technical marvel. Running at a clock speed of 8 MHz, it was widely recognized as the fastest personal computer in the world at launch, outperforming IBM- compatible PCs, Apple Macintoshes, and Commodore Amigas by a vast margin. Paired with its custom, multitasking operating system, wrist-cut OS, software that allowed a computer to run multiple programs simultaneously in smooth desktop windows, the Archimedes offered fluid graphics, instantaneous spreadsheet updates, and high-fidelity digital audio. Yet, the economic realities of the British marketplace immediately asserted themselves.

ARM is founded - 1990

ARM was officially founded as a company in November 1990 as Advanced RISC Machines Ltd, which was a joint venture between Acorn Computers, Apple Computer (now Apple Inc.), and VLSI Technology (now NXP Semiconductors N.V). The company was founded by 12 Arm architecture designers: Jamie Urquhart, Mike Muller, Tudor Brown, Lee Smith, John Biggs, Harry Oldham, Dave Howard, Pete Harrod, Harry Meekings, Al Thomas, Andy Merritt, and David Seal. In 1991, Sir Robin Saxby joined the company as the first Chairman and CEO, with the team setting out to change the computing landscape from an old turkey barn in Cambridgeshire.

 

ARM goes into mobile - 1993

In 1993, Arm signed a deal with silicon vendor, Texas Instruments, with the company advising Nokia to use the Arm designs for its upcoming GSM mobile phones. The Arm-powered Nokia 6110 GSM mobile phone was a massive success, with the Arm7 processor becoming the flagship mobile design for Arm. Today, more than 99 percent of the world’s smartphones are based on Arm technology.

NOKIA 6110 Release date - December 1997

 

The breakthrough in global mobile communications arrived through that strategic partnership with Texas Instruments, a colossal American semiconductor manufacturer. In the mid-1990s, Texas Instruments was working closely with Nokia, a Finnish telecommunications company preparing to dominate the rollout of the new European GSM network. GSM, Global System for Mobile Communications, was a digital cellular standard that replaced older analog networks, requiring mobile phones to digitally compress and transmit voice data in real time. Nokia's engineers faced a severe physical limitation. Processing digital audio required significant computational power, but mobile phone batteries of the era were heavy, expensive, and limited in capacity. When they tested traditional processors from established silicon giants, the chips generated too much heat and drained the battery in hours. But when they evaluated the ARM7, a new 32-bit iteration of the Cambridge design, they found a processor that delivered immense computational throughput while sipping minimal electricity. However, memory chips for mobile phones were incredibly expensive. Nokia demanded that the processor use less memory (64k) to store its software instructions. In response, ARM's engineers back in Cambridgeshire invented an architectural extension called THUMB instruction set, a clever software modification that compressed 32-bit instructions into 16-bit spaces, drastically reducing the amount of memory a mobile phone required to function without sacrificing performance.

Texas Instruments - Corporate Headquarters

NOKIA Europe - Head Office

The result of this collaboration launched in December 1997, the Nokia 6110. For millions of users across the United Kingdom and Europe, the Nokia 6110 was a revelation. It had a sleek profile, a menu system that responded instantly, a battery that could last for a week on a single charge, and a pre-loaded digital game called Snake. A British professional playing Snake on a train carriage, or a teenager texting in a high street shopping center, likely had no idea that the logic executing those pixels had been designed in a Cambridgeshire barn. Beneath the dark plastic casing, the Nokia 6110 was secretly a British computing triumph. The explosive success of Nokia fundamentally altered ARM's trajectory. As Nokia grew into the dominant mobile phone manufacturer on Earth, ARM's licensing model became a financial engine of staggering power. Because ARM earned a small royalty, a tiny percentage of the sale price, on every single physical chip manufactured by its partners, its revenue scaled automatically with the explosion of the global mobile phone market. ARM did not have to pay for plastic, glass, or assembly lines. It only sold the math. By the end of 1997, ARM was licensing its blueprints to global electronics giants, including Samsung, Sharp, Alcatel, and Sony. In April 1998, ARM Holdings floated as a public company, listing simultaneously on the London Stock Exchange and the American Nasdaq.

Ray Kurzweil - On Wikipedia - CLICK HERE : Dr Roman Yampolskiy - On Wikipedia - CLICK HERE : Geoffrey Hinton - On Wikipedia - CLICK HERE

 

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