🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: alt.sys.sun
Article #913

Re: Justification for the use of 9-bit wide RAM modules

#913
From: John DiMarco
Date: Fri, 14 Jul 1995 00:00
23 lines
1891 bytes
mark@taylor.infi.net (Mark Davis) writes:

>Parity RAM is next to useless.  It is really a waste of valuable bits.
>The only logical approach is to use no parity, or use ECC RAM.
>Parity memory can't even detect but SOME memory errors, and can't do
>ANYTHING about it, except warn (or as pointed out, just go ahead and
>crash the system anyway).

I disagree.  Without parity, single-bit errors will silently corrupt data.
This can be very problematic.  A system panic is often preferable.

Of course, ECC memory provides significantly more protection than parity, but 
the extra two bits per byte makes it more costly.  Parity is a reasonable 
compromise for desktop workstations.

Regards,

John
--
John DiMarco <jdd@cdf.toronto.edu>                        Office: EA201B
Computing Disciplines Facility Systems Manager            Phone: 416-978-1928
University of Toronto                                     Fax:   416-978-1931
http://www.cdf.toronto.edu/personal/jdd/jdd.html
Technical Details
Message-ID: <jdd.805748096@cdf.toronto.edu>
Path: arc1-ca.pugleaf.net!unknown!not-for-mail
References: <3tqpb5$dl8@orb.apana.org.au> <3u2981$9i9@melang.connect.com.au> <1995Jul14.030358.28194@taylor.infi.net>

Show Full Headers
Complete Article Headers
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: f4671,4711ba0969b34d53
X-Google-Attributes: gidf4671,public
X-Google-Thread: f88e1,4711ba0969b34d53
X-Google-Attributes: gidf88e1,public
X-Google-Thread: 1070f0,4711ba0969b34d53
X-Google-Attributes: gid1070f0,public
X-Google-Thread: 10d053,4711ba0969b34d53
X-Google-Attributes: gid10d053,public
From: jdd@cdf.toronto.edu (John DiMarco)
Subject: Re: Justification for the use of 9-bit wide RAM modules
Date: 1995/07/14
Message-ID: <jdd.805748096@cdf.toronto.edu>
X-Deja-AN: 106176959
distribution: inet
sender: news@cdf.toronto.edu (Usenet News)
references: <3tqpb5$dl8@orb.apana.org.au> <3u2981$9i9@melang.connect.com.au> <1995Jul14.030358.28194@taylor.infi.net>
organization: University of Toronto Computing Disciplines Facility
newsgroups: alt.sys.sun,aus.computers.sun,comp.sys.sun.admin,comp.sys.sun.hardware