Editing PA-RISC (section)

{{Short description|Instruction set architecture by Hewlett-Packard}}
{{Use dmy dates|date=September 2024}}
{{Infobox CPU architecture
| image      = PA-RISC logo.svg
| name       = PA-RISC (HP/PA)
| designer   = [[Hewlett-Packard]]
| bits       = [[64-bit]] (32→64)
| introduced = 1986 (1996 PA-RISC 2.0)
| version    = 2.0 (1996)
| design     = RISC
| type       = 
| encoding   = Fixed
| branching  = Compare and branch
| endianness = Big
| extensions = [[Multimedia Acceleration eXtensions]] (MAX), MAX-2
| open       = No
| gpr        = 32
| fpr        = 32 64-bit (16 64-bit in PA-RISC 1.0)
| successor  = PA-WideWord → [[Itanium]]<ref>{{Cite web |url=https://www.hpl.hp.com/news/2001/apr-jun/itanium.html |title=Inventing Itanium: How HP Labs helped create the next-generation chip architecture |date=1 June 2001 |access-date=2024-03-24 |website=HP Labs |archive-url=https://web.archive.org/web/20020207061639/https://www.hpl.hp.com/news/2001/apr-jun/itanium.html |archive-date=2002-02-07}}</ref>
}}
[[Image:HP PA-RISC 7300LC.jpg|thumb|[[Hewlett-Packard|HP]] PA-RISC 7300LC microprocessor]]
[[File:HP-HP9000-C110-Workstation 21.jpg|thumb|[[HP 9000]] C110 PA-RISC [[workstation]] booting [[Debian]] [[GNU]]/[[Linux]] ]]

'''Precision Architecture [[reduced instruction set computer|RISC]]''' ('''PA-RISC''') or '''Hewlett Packard Precision Architecture''' ('''HP/PA''' or simply '''HPPA'''), is a [[computer|general purpose computer]] [[instruction set architecture]] (ISA) developed by [[Hewlett-Packard]] from the 1980s until the 2000s.

The architecture was introduced on 26 February 1986, when the [[HP 3000|HP 3000 Series 930]] and [[HP 9000|HP 9000 Model 840]] computers were launched featuring the first implementation, the TS1.<ref>"One Year Ago". (26 February 1987). ''Computer Business Review''.</ref><ref>{{cite journal |first=Peter |last=Rosenbladt |title=In this Issue |date=September 1987 |journal=Hewlett-Packard Journal |volume=38 |issue=9 |page=3 |quote=... In the March 1987 issue we described the HP 3000 Series 930 and HP 9000 Model 840 Computers, which were HP's first realizations of HP Precision Architecture in off-the-shelf TTL technology. ... |url=http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1987-09.pdf |access-date=2018-06-08 |archive-date=2019-04-26 |archive-url=https://web.archive.org/web/20190426201814/https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1987-09.pdf |url-status=live }}</ref> HP stopped selling PA-RISC-based HP 9000 systems at the end of 2008 but supported servers running PA-RISC chips until 2013.<ref>{{cite web| url = http://www.hp.com/products1/evolution/9000/faqs.html#2| title = How long will HP continue to support HP 9000 systems?| access-date = 29 February 2008| archive-date = 19 February 2012| archive-url = https://web.archive.org/web/20120219181247/http://www.hp.com/products1/evolution/9000/faqs.html#2| url-status = dead}}</ref> PA-RISC was succeeded by the [[Itanium]] (originally IA-64) ISA, jointly developed by HP and [[Intel]].<ref>{{cite web| url = http://www.informationweek.com/story/showArticle.jhtml?articleID=164302278| title = HP Completes Its PA-RISC Road Map With Final Processor Upgrade| access-date = 24 July 2007| archive-date = 13 February 2008| archive-url = https://web.archive.org/web/20080213092224/http://www.informationweek.com/story/showArticle.jhtml?articleID=164302278| url-status = live}}</ref>