Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!news.mixmin.net!news2.arglkargh.de!news.theremailer.net!frell.theremailer.net!anonymous From: Fritz Wuehler Comments: This message did not originate from the Sender address above. It was remailed automatically by anonymizing remailer software. Please report problems or inappropriate use to the remailer administrator at . Identifying the real sender is technically impossible. Newsgroups: comp.lang.java.programmer Subject: Re: Program in 32-bit, run on 64-bit OK? References: Message-ID: <6884bfa9e1d6b09fa2650bcb1539dd19@msgid.frell.theremailer.net> Precedence: anon Date: Fri, 16 Nov 2012 16:44:15 +0100 Mail-To-News-Contact: abuse@frell.theremailer.net Organization: Frell Anonymous Remailer Xref: csiph.com comp.lang.java.programmer:19768 "SL@maxis" wrote: > On Fri, 16 Nov 2012 07:08:58 +0800, Stuart wrote: > > > > > Wrong. Typical 64 bit processors have either a 36 bit or a 40 bit > > physical address bus (40 bits are 1 TB, an almost incredible amount of > > RAM, wikipedia mentions that some AMD chips even offer a 48 bit memory > > bus). Note that bus width and register width do not have to have a > > one-to-one relationship. The early 286 processor had a register width of > > 16 bits but an address bus with 24 bits (4MB), so they had to invent > > this segmentation model in order to compute a 20bit address from two 16 > > bit registers. Twenty years later, the segmenation unit is still present > > at the Intel architecture while the numbers have been reversed: now the > > 36 or 40 bit physical address is computed from a 16 bit value and a 64 > > bit value. Sounds like overkill, and yes, it is. That's just for > > backwards compatibility for applications from 1985. > > > > Regards, > > Stuart > > Thanks. I am not too sure now :-( > > I have an old Intel Pentium 4 1500Mhz PC. Can it run 64-bit OS ? No standard 64 bit OS will run on a P4.