RISC OS Timeline


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The events surrounding development of RISC OS beyond its last release by Acorn (version 3.7) have become contentious in the RISC OS world, usually as a result of those trying to rewrite history to their own ends. What follows is a hopefully the most accurate version of events to date, and will serve as a reference to point people at in future.

This timeline is based directly on information provided by Steve Revill (a former Acorn employee) and Peter Howkins (who maintains a database of RISC OS version information). It was compiled by Peter Naulls.

This is a work in progress and references are still to be added.

  • NCOS is merged back into CVS both before and during RISC OS 3.80 development.
  • 25/8/1998 - Acorn Release RISC OS 3.8 to registered developers. 3.80, codenamed Ursula is the 'beta' for the version of RISC OSthat will appear in the RPC2 (Phoebe). It has been deliberately nobbled to only run on ARM 6 and ARM7 machines to discourage developers from keeping their SA RPC and 3.80

once the RPC2 is released RISC OS 3.80 has some bugs, but generally shows about 90% of the content/work of RISC OS 4.02. A SA capable ROM image was made available to a few people as well, and likely used in house at Acorn.

  • 17/9/1998 - Acorn Closes the workstation division, ceases devlopement on Phoebe. RISC OS development continues as a black project amongst a few engineers, leading to the various revisions of Ursula ROM softload patches for RiscPC
  • 15/01/1999 - The remaining parts of Acorn rename as Element 14 Ltd.
  • 05/03/1999 - RISCOS Ltd secure the rights to develop RISC OS for the desktop market and receive source code from Element 14. This was probably the latest version to date, and includes some early 32-bit and HAL work.
  • 27/04/1999 - The breakup of Element 14 Ltd to free up its ARM shares. The bank MSDW purchase the shares of Element 14, then sell the silicon design buisness to Stan Boland and the

management team for 1.5 million (GBP). The STB buisness went to Pace for 200,000 ukp. These changes are finalised by 03/06/1999

  • 01/07/1999 - RISCOS Ltd, having completed RISC OS code to a sellable state, release RISC OS 4.02 for sale to the general public.
  • 10/2000 - Element 14, the silicon design buiness, is sold to Broadcom in a stock deal worth approx 594 million (USD)
  • 08/08/2000 - 02/04/2001 - Pace Engineers continue to build softloadable versions of RISC OS for RPCs including the 32-bit/HAL work. These are considerably more polished than 3.80, and appear to be as feature complete as ROL's 4.02. Some code from RISC OS 4.02 is included from ROL (who is now selling Select).
  • 02/11/2002 - Castle use a Pace derived version of RISC OS as version 5 in the Iyonix
  •  ?? - Castle purchase RISC OS from Pace
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