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{{Short description|System architecture for PowerPC-based computer systems}}
{{POWER, PowerPC, and Power ISA}}

'''Common Hardware Reference Platform''' ('''CHRP''') is a standard [[system architecture]] for [[PowerPC]]-based computer systems published jointly by [[IBM]] and [[Apple Inc.|Apple]] in 1995. Like its predecessor [[PowerPC Reference Platform|PReP]], it was conceptualized as a design to allow various operating systems to run on an industry standard hardware platform, and specified the use of [[Open Firmware]] and [[Run-Time Abstraction Services|RTAS]] for machine abstraction purposes.

== History ==

Unlike [[PReP]], CHRP incorporated elements of the [[Power Macintosh]] architecture and was intended to support the [[classic Mac OS]] and [[NetWare]], in addition to the four operating systems that had been ported to PReP at the time ([[Windows NT]], [[OS/2]], [[Solaris (operating system)|Solaris]], and [[AIX (operating system)|AIX]]).

CHRP did not receive industry-wide adoption, however. The only systems to ship with actual CHRP hardware are certain members of IBM's [[RS/6000]] series running [[AIX operating system|AIX]], and small amount of Motorola PowerStack workstations.<ref>{{Cite web|title=2.1. Supported Hardware|url=https://www.debian.org/releases/jessie/powerpc/ch02s01.html.en|access-date=2021-09-30|website=www.debian.org|archive-date=2021-09-30|archive-url=https://web.archive.org/web/20210930111134/https://www.debian.org/releases/jessie/powerpc/ch02s01.html.en|url-status=dead}}</ref>

Apple had planned to support CHRP on [[Mac OS 8]], and expected [[Macintosh clone]] manufacturers to adopt it for their future hardware. However, after their acquisition of [[NeXT]] and appointment of [[Steve Jobs]] as acting CEO, Apple began to phase out the clone program, and decided against licensing any CHRP-based hardware.<ref>{{Cite web |last=Writer |first=CBR Staff |date=1997-05-21 |title=APPLE KEEPS CLONE MAKERS WAITING OVER MAC OS 8 TERMS |url=https://www.techmonitor.ai/hardware/cloud/apple_keeps_clone_makers_waiting_over_mac_os_8_terms_1 |access-date=2025-11-10 |website=Computer Business Review |language=en-US}}</ref><ref>{{Cite web |date=1997-08-11 |title=Apple Sending Clone Makers Mixed Signals |url=https://archive.nytimes.com/www.nytimes.com/library/cyber/week/081197apple.html |access-date=2025-11-10 |website=The New York Times}}</ref><ref>{{Cite web |date=1997-08-19 |title=Apple Won't OK Newest Computers From Clone-Makers |url=https://www.sfgate.com/business/article/Apple-Won-t-OK-Newest-Computers-From-Clone-Makers-2812072.php |access-date=2025-11-09 |website=[[San Francisco Examiner]]}}</ref>

[[Power.org]] has a new [[Power Architecture Platform Reference]] (PAPR) that provides the foundation for development of [[Power ISA]]-based computers running the Linux operating system. The PAPR was released fourth quarter of 2006.

==See also==
* [[OpenPIC and IBM MPIC]]

== Notes ==

{{refs}}

== References ==

{{refbegin}}
* [https://public.dhe.ibm.com/rs6000/technology/spec/chrp/ CHRP Specification Version 1.0 and related documents]
* [https://public.dhe.ibm.com/rs6000/technology/spec/jointhrp.ps The PowerPC (TM) Hardware Reference Platform], an overview of CHRP
* {{Cite web |url=http://www.apple.com/ca/press/1997/08/MacOS8Sales.html |title=Apple Canada Press Release |access-date=October 9, 2007 |archive-url=https://web.archive.org/web/20090423083234/http://www.apple.com/ca/press/1997/08/MacOS8Sales.html |archive-date=April 23, 2009 |url-status=bot: unknown }}
* [http://mail-index.netbsd.org/port-powerpc/2002/08/06/0001.html PREP / CHRP / ofppc / macppc confusion] on NetBSD port-powerpc mailing list.
{{refend}}

==External links==
* [https://web.archive.org/web/20050204185329/http://penguinppc.org/otherhw/#chrp penguinppc.org description of CHRP]
* [http://www.firmworks.com/www/chrpdoc.htm FirmWorks CHRP page]
* [http://lowendmac.com/1997/motorola-starmax-6000/ Motorola StarMax 6000 at Low End Mac], A CHRP machine that never shipped.

[[Category:PowerPC mainboards]]
[[Category:IBM computer hardware]]

{{Comp-hardware-stub}}

Common Hardware Reference Platform - Revision history

imported>ViperSnake151: /* History */