Pa-Risc Performance and History

Posted4 months agoActive4 months ago

naves

30 points

5 comments

openpa.netTechstory

calmmixed

Debate

20/100

Pa-RiscHp-UXItaniumComputer Architecture

Key topics

Pa-Risc

Hp-UX

Itanium

Computer Architecture

The post shares a resource on the history and performance of PA-RISC processors, sparking discussion on related topics like Itanium and the availability of HP-UX documentation.

Snapshot generated from the HN discussion

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Light discussion

First comment

Peak period

72-78h

Avg / period

1.3

Key moments

01Story posted
Sep 13, 2025 at 3:04 PM EDT
4 months ago
Step 01
02First comment
Sep 13, 2025 at 5:31 PM EDT
2h after posting
Step 02
03Peak activity
2 comments in 72-78h
Hottest window of the conversation
Step 03
04Latest activity
Sep 17, 2025 at 4:24 AM EDT
4 months ago
Step 04

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Discussion (5 comments)

Showing 5 comments

hulitu

4 months ago

1 reply

> PA-RISC Performance and History

Itanium is not PA-RISC. The article is thin.

KerrAvon

4 months ago

It doesn't really claim that though, does it? I thought it was clear it was a follow on from PA-RISC, though I may be filtering it through my own brain.

pjmlp

4 months ago

Unfortunely most of the HP-UX documentation I used to browse regularly is now gone from HP website, at least from public pages, lots of broken links even when we manage to find some old PDFs.

I guess, it might be support/partners eyes only nowadays.

sillywalk

4 months ago

Bitsavers has an interesting paper on PA-RISC 2.0 (the jump to 64 bits). It's got a high-level introduction, and then all the actual details.

https://bitsavers.org/pdf/hp/pa-risc/PA_RISC_2.0_Architectur... (2MB file)

hawflakes

4 months ago

Having briefly worked at HP on the IA64 effort IIRC the PA-RISC chips fabbed at Intel were the side-effect of the Itanium agreement. HP was owed a certain volume of chips and since Merced was very delayed they had to make those chips for HP.

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