From owner-freebsd-hackers Tue Dec 4 20:52:44 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from web11504.mail.yahoo.com (web11504.mail.yahoo.com [216.136.172.36]) by hub.freebsd.org (Postfix) with SMTP id CF77637B405 for ; Tue, 4 Dec 2001 20:52:40 -0800 (PST) Message-ID: <20011205045240.75224.qmail@web11504.mail.yahoo.com> Received: from [200.68.134.123] by web11504.mail.yahoo.com via HTTP; Tue, 04 Dec 2001 20:52:40 PST Date: Tue, 4 Dec 2001 20:52:40 -0800 (PST) From: Fabio Miranda Subject: offtopic: assembly To: hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hi, i am freebsd user since 3.1-release, I am reading Peter Abel book about assembly and i have the following doubt: I want to understand Why each byte (8 bit of data and 1 bit of parity) has one bit of parity? What is parity for? Why the processor needs to know if certain byte in memory is "par" or "impar" (i dont know how to say it in english..). Please, give me a *wide* explaination, that's the part of the book i dont get it. The memory is divided in 'bytes', each one with an address starting, right?, so, when an instruction needs to check a byte, the processor looks its parity, right? If so, What for? why? what is the idea? what makes the difference from 'par' to 'no par'?, usually, why an instruction needs to check a byte? What part of the program do the requested byte belongs (Code, data, stack)? Thank you very much. p.s. Anyone know a site like linux's www.linuxassembly.org? I want to know the freebsd developer's resources on web ( i am not lucky to buy books online and my bookstores arent unix-focused:)), i want to understand freebsd internals! __________________________________________________ Do You Yahoo!? Buy the perfect holiday gifts at Yahoo! Shopping. http://shopping.yahoo.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message