RISC/OS - Revision history

Raion at 05:31, 4 October 2025

2025-10-04T05:31:16Z

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			[[File:MIPS Computer Systems Logo.png\|alt=The MIPS Computer Systems Logo, also used for RISC/OS and UMIPS\|thumb\|The MIPS Computer Systems Logo, also used for RISC/OS and UMIPS]]
	'''RISC/OS''', also known as '''UMIPS''' was an early BSD and System V-based UNIX produced by MIPS Computer Systems. Beginning as a 4.3BSD port in 1986, it evolved into a dual-universe System V/4.3BSD UNIX and later formed one of the core codebases folded into SGI’s 4D1/IRIX, Unlike [[GL2-1.x\|GL2]], RISC/OS had roots in both BSD and System V. When SGI purchased MIPS Computer Systems, it was quickly phased out and [[4D1-3.x]] and later [[IRIX 4.0]] were offered as successors.		'''RISC/OS''', also known as '''UMIPS''' was an early BSD and System V-based UNIX produced by MIPS Computer Systems. Beginning as a 4.3BSD port in 1986, it evolved into a dual-universe System V/4.3BSD UNIX and later formed one of the core codebases folded into SGI’s 4D1/IRIX, Unlike [[GL2-1.x\|GL2]], RISC/OS had roots in both BSD and System V. When SGI purchased MIPS Computer Systems, it was quickly phased out and [[4D1-3.x]] and later [[IRIX 4.0]] were offered as successors.

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	* '''RISC/os 4.x (late 1980s — 1990)''' — formal RISC/os series based on System V Release 3.		* '''RISC/os 4.x (late 1980s — 1990)''' — formal RISC/os series based on System V Release 3.
	* '''RISC/os 5.x (1991)''' — based on System V Release 4; RISC/os 5.0 released October 28, 1991. This was the final version of RISC/os as SGI discontinued it in 1992.		* '''RISC/os 5.x (1991)''' — based on System V Release 4; RISC/os 5.0 released October 28, 1991. This was the final version of RISC/os as SGI discontinued it in 1992.
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Raion at 02:27, 27 September 2025

2025-09-27T02:27:27Z

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	* '''UMIPS 2.x / 3.x''' — continued development; by UMIPS 3.10 the RISC/os name was already being used informally.		* '''UMIPS 2.x / 3.x''' — continued development; by UMIPS 3.10 the RISC/os name was already being used informally.
	* '''RISC/os 4.x (late 1980s — 1990)''' — formal RISC/os series based on System V Release 3.		* '''RISC/os 4.x (late 1980s — 1990)''' — formal RISC/os series based on System V Release 3.
	* '''RISC/os 5.x (1991)''' — based on System V Release 4; RISC/os 5.0 released October 28, 1991. This was the final version of RISC/os as SGI discontinued it in 1992.		* '''RISC/os 5.x (1991)''' — based on System V Release 4; RISC/os 5.0 released October 28, 1991. This was the final version of RISC/os as SGI discontinued it in 1992.
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Raion at 03:52, 25 September 2025

2025-09-25T03:52:40Z

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-'''RISC/OS''', also known as '''UMIPS''' was an early UNIX produced by MIPS Computer Systems, and a predecessor of both 4D1 and IRIX. Unlike [[GL2-1.x|GL2]], RISC/OS had roots in both BSD and System V. When SGI purchased MIPS, it was succeeded by 4D1-1.x.
+'''RISC/OS''', also known as '''UMIPS''' was an early BSD and System V-based UNIX produced by MIPS Computer Systems. Beginning as a 4.3BSD port in 1986, it evolved into a dual-universe System V/4.3BSD UNIX and later formed one of the core codebases folded into SGI’s 4D1/IRIX, Unlike [[GL2-1.x|GL2]], RISC/OS had roots in both BSD and System V. When SGI purchased MIPS Computer Systems, it was quickly phased out and [[4D1-3.x]] and later [[IRIX 4.0]] were offered as successors.
-=== Versions ===
+== History ==
-It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991.
+UMIPS 1.0 was a crude 4.3BSD port shipped with the MIPS M/500 systems in late 1986. As AT&T released System V R3 (1987), MIPS added System V compatibility and a dual-universe mode so administrators and users could select BSD or System V behavior for their system codebase (separate command sets, libraries, headers, etc.). Over time the UMIPS name gave way to the RISC/os brand for later releases. The final release was offered in 1992.
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Raion at 00:15, 22 September 2025

2025-09-22T00:15:31Z

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Raion at 03:28, 21 September 2025

2025-09-21T03:28:03Z

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	=== Versions ===		=== Versions ===
	It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991.		It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991.

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Raion: Created page with "'''RISC/OS''', also known as '''UMIPS''' was an early UNIX produced by MIPS Computer Systems, and a predecessor of both 4D1 and IRIX. Unlike GL2, RISC/OS had roots in both BSD and System V. When SGI purchased MIPS, it was succeeded by 4D1-1.x. === Versions === It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991."

2025-09-18T02:56:05Z

Created page with "'''RISC/OS''', also known as '''UMIPS''' was an early UNIX produced by MIPS Computer Systems, and a predecessor of both 4D1 and IRIX. Unlike GL2, RISC/OS had roots in both BSD and System V. When SGI purchased MIPS, it was succeeded by 4D1-1.x. === Versions === It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991."

New page

'''RISC/OS''', also known as '''UMIPS''' was an early UNIX produced by MIPS Computer Systems, and a predecessor of both 4D1 and IRIX. Unlike [[GL2-1.x|GL2]], RISC/OS had roots in both BSD and System V. When SGI purchased MIPS, it was succeeded by 4D1-1.x.

=== Versions ===
It was referred to as '''UMIPS''' between releases 1 through 3. 4.x and onwards were RISC/OS. The final release, based on Release 4 of System V, was released in 1991.