https://rs-485.com/index.php?action=history&feed=atom&title=HP_Precision_BusHP Precision Bus - Revision history2026-05-04T19:43:33ZRevision history for this page on the wikiMediaWiki 1.42.3https://rs-485.com/index.php?title=HP_Precision_Bus&diff=590&oldid=prevRS-485: Imported from Wikipedia (overwrite)2026-05-02T18:15:08Z<p>Imported from Wikipedia (overwrite)</p>
<p><b>New page</b></p><div>{{Short description|Data transfer system of Unix}}<br />
{{see also|HP 3000}}<br />
[[File:HP Precision Architecture - precision bus highlighted.svg|thumb|350px|Bus scheme with optional interfaces]]<br />
The '''HP Precision bus''' (also called '''HP-PB''' and '''HP-NIO''')<ref>[http://ftp.parisc-linux.org/docs/platforms/980723.pdf "HP-UX Workstation HCL"] {{Webarchive|url=https://web.archive.org/web/20111128152909/http://ftp.parisc-linux.org/docs/platforms/980723.pdf |date=2011-11-28 }}.<br />
1998.<br />
Page 139.</ref><br />
is the data transfer [[bus (computing)|bus]] of the proprietary [[Hewlett Packard]] architecture [[HP 3000]] and later many variants of the HP 9000 series of UNIX systems. This bus has a 32-bit data path with an 8 [[MHz]] [[clock signal|clock]]. It supports a maximum transfer rate of 23 [[byte|MB]]/s in [[burst mode (computing)|burst mode]]. That bus was also used to directly support the Programmable Serial Interface (PSI) cards, which offered multi-protocol support for networking, notably [[Binary Synchronous Communications|IBM Bisync]] and similar systems.The 920, 922 and 932 series supported up to three PSI cards, and up to five cards in the 948 and 958 series.<br />
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Two form factors/sizes of HP-PB expansion cards were sold: single and double.<ref>{{Cite web|title=PA-RISC Buses - OpenPA.net|url=https://www.openpa.net/bus.html|access-date=2020-12-07|website=www.openpa.net}}</ref><br />
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* 32-bit data path width<br />
* 32 MB/s maximum data rate<br />
* 8&nbsp;MHz maximum frequency<br />
* 5 V signalling voltage<br />
* 96-pin (32×3) female pin+socket card connector ''(Is this a [[DIN 41612]] connector?)''<br />
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==External links==<br />
*[http://docs.hp.com/cgi-bin/doc3k/B59608250.11943/1 HP 3000 manuals]<br />
*[http://www.openpa.net/bus.html HP/PA buses on Openpa.net]<br />
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==Notes==<br />
{{reflist}}<br />
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{{Computer-bus}}<br />
{{Hewlett-Packard}}<br />
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[[Category:Computer buses]]<br />
[[Category:Hewlett-Packard products|Precision Bus]]<br />
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