|This article needs additional citations for verification. (August 2009)|
|Founded||Cardiff, UK (January 7, 1999 )|
|Defunct||May 14, 2013|
|Key people||Paul Middleton, Co-founder and Managing director|
|Products||RISC OS 4, RISC OS 6|
|Website||riscos.com (before 2013-03-04)|
RISCOS Ltd. (also referred to as ROL) was a limited company engaged in computer software and IT consulting. It licensed the rights to continue the development of and to distribute it for desktop machines (as an upgrade or for new machines) from Element 14 and subsequently Pace Micro Technology. Company founders include developers who formerly worked within Acorn's dealership network. It was established as a nonprofit company. On or before 4 March 2013 3QD Developments acquired RISCOS Ltd's flavour of RISC OS. RISCOS Ltd was dissolved on 14 May 2013.
RISCOS Ltd was formed to continue end-user-focused development of RISC OS after the de-listing of Acorn Computers, following its purchase by Morgan Stanley Dean Witter in order to benefit from the shareholding that Acorn held in ARM Ltd. In March 1999, RISCOS Ltd obtained exclusive rights to develop and sell RISC OS 4 for the desktop market from Element 14. A few weeks later Pace purchased Acorn's Cambridge headquarters and staff for £200,000 and then continued to develop its own, in-house version of RISC OS, primarily for set-top boxes and other embedded devices.
At the time of the company's formation, it was noted that having access to the source code could facilitate removal of the OS's dependence on Acorn's proprietary chips. This simplifies entry to the hardware market by new companies.
RISC OS 4
RISCOS Ltd completed work on RISC OS 4 and in July 1999 it was released as an upgrade for existing machines, priced at £120. Improvements include support for long filenames, larger disk sizes and partitions, along with a new desktop look.
Work then continued on a system of soft-loaded updated versions of the OS, released under an annual subscription release scheme named RISC OS Select in 2002.
In 2004, the company replaced its baseline RISC OS 4.02 product with an updated version of the OS named RISC OS Adjust. This version of RISC OS was based on version 4.39, or Select Edition 3 Issue 4, of the company's Select scheme. In the same year, RISCOS Ltd agreed to produce a fully 32-bit-compatible version of RISC OS Adjust for Advantage Six's A9home product. The A9home was released in May 2006 after a 12-month beta-testing process, although the build of Adjust 32, namely RISC OS 4.42, is not feature-complete.
RISC OS Six
In October 2006, a beta-version of RISC OS Six was made available for download by subscribers to the Select scheme. RISC OS Six represents the next generation of RISCOS Ltd's stream of the operating system. Significant portability, stability and internal structure improvements, including full 26/32-bit neutrality, have laid the foundations for the company's future releases, all of which will be based on version 6. The first product to be based on RISC OS Six will be Select Edition 4. RISC OS Six is 32-bit-neutral and can be built to run in either 26-bit or 32-bit modes. It runs on the Risc PC and A9home, but it doesn't run on newer-generation hardware such as the Iyonix PC and ARMini, which do not support the 26-bit addressing used on the older Acorn computers and require specific hardware support for the newer ARM V6 and V7 Architecture chips that they use.
In November 2002 Castle Technology Ltd released a modified version of Pace's 32-bit RISC OS as RISC OS 5 for their Iyonix PC, in apparent contravention of the licence agreement that RISCOS Ltd held with Element 14. In July 2003, Castle bought all technology rights to RISC OS from Pace in an attempt to legalise the situation. In January 2004, Castle also took over Tematic Ltd., the company formed by ex-Pace engineers when they were made redundant in March 2003. The result was a long-running and acrimonious dispute between RISCOS Ltd and Castle over licensing, which ultimately lead to Castle claiming to terminate RISCOS Ltd's licence to develop, sell and sub-license RISC OS 4. RISCOS Ltd refuted all the claims made and challenged Castle to identify how and from whom they had acquired RISC OS 5. An end to the dispute was signalled when RISCOS Ltd and Castle agreed to work on attempting to merge their development streams and re-unify RISC OS, with Castle's engineers working on key system functionality and RISCOS Ltd on user-facing elements. One of the conditions was that RISCOS Ltd agreed to be renamed RISC OS Developments Ltd. ROL and Castle subsequently agreed to merge RISC OS 4 and RISC OS 5 together, as of 2011 this merge hasn't happened.
Castle's Tematic division was dramatically closed in September 2005. As of December 2005, RISCOS Ltd are still trading under the name RISCOS Ltd.
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