Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpda!hpcuhc!hpcupt3!daryl
From: daryl@hpcupt3.cup.hp.com (Daryl Odnert)
Newsgroups: comp.arch
Subject: Re: Snakebytes (long -- and poisonous?)
Message-ID: <45760006@hpcupt3.cup.hp.com>
Date: 28 Mar 91 00:43:13 GMT
References: <69465@brunix.UUCP>
Organization: Hewlett Packard, Cupertino
Lines: 18

> Are the new PA machines binary compatible with the old ones?  Reading
> the press, it sounds like there are new instructions in the new 
> machines so that while the old programs will run, the full performance
> will not be achieved unless you recompile.  Is this true?
>
> Donald A. Lewine

Yes, this is true.  The new PA-RISC machines, the HP9000 Series 700, are
binary compatible in the sense that PA-RISC 1.0 HP-UX binaries will run
without modification on the PA-RISC 1.1 processor running HP-UX.
To take advantage of the new instructions and registers in PA-RISC 1.1
you do need to recompile.  Code compiled for PA-RISC 1.1 will not run
on PA-RISC 1.0 based systems.

Daryl Odnert            daryl@hpcllla.cup.hp.com
Hewlett-Packard
California Language Lab
Cuptertino, California