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Acorn RISC Machine was the original name of Acorn’s ARM processor project. The first ARM1 silicon was produced in 1985. In 1990, the processor group became a separate company called Advanced RISC Machines Ltd, which explains the later expansion of the same initials.
What does Acorn RISC Machine mean?
Arm Education describes the name directly: “This secret project was named ‘Acorn RISC Machine’ (ARM, in short).” The name referred to Acorn’s processor project, not to a later company. In the acronym, RISC means “Reduced Instruction Set Computing,” the design approach identified by the project’s name. Arm Education explains the original expansion.
Acorn pursued the processor because existing microprocessors did not suit the company’s plans for future computers. The intended processor would run programs on Acorn machines, including word processing, spreadsheet calculations, and graphics rendering, according to Arm’s company history.
Why does ARM also mean Advanced RISC Machines?
The two expansions belong to different stages of ARM’s history. Acorn RISC Machine was the project name. In November 1990, the processor group became a separate company named Advanced RISC Machines Ltd. Arm says it was established as a joint venture between Acorn Computers, Apple Computer, and VLSI Technology. A later Arm Community account says the retained name “Arm” subsequently stopped standing for an expansion. Arm Community’s history of ARM1 describes that naming change.
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| Context | Expansion or name | What it refers to |
|---|---|---|
| Acorn processor project | Acorn RISC Machine | The original project name |
| Company founded in November 1990 | Advanced RISC Machines Ltd | The later company formed as a joint venture |
| Subsequent usage | Arm | The name no longer treated as an expansion, according to Arm Community |
How the project developed
- Around late 1983 or early 1984: Arm Community places the project’s start around this period. The source does not give a more precise start date.
- April 1985: Arm’s programmer’s guide says the first ARM1 silicon was produced in April. Arm Community gives 26 April 1985 as the date the first chip was delivered to Acorn. Arm’s programmer’s guide and the Arm Community history describe these milestones.
- 1987: Arm’s architecture retrospective identifies the Acorn Archimedes as the first system to showcase the architecture. Arm’s architecture retrospective gives the year.
- November 1990: Arm says the separate company, Advanced RISC Machines Ltd, was officially founded as a joint venture. Arm’s company history describes the transition.
Who designed ARM1?
Arm’s programmer’s guide credits a team at Acorn led by Sophie Wilson and Steve Furber with designing ARM1. The processor project addressed Acorn’s need for a processor for its computers; it was not originally the name of a standalone company.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which expansion should you use?
For the original Acorn project, use Acorn RISC Machine. For the company established in 1990, use Advanced RISC Machines Ltd. The initials connect the two names, but they describe different historical contexts.
Quick Recap
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