home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!usc!sol.ctr.columbia.edu!spool.mu.edu!umn.edu!msus1.msus.edu!msus1.msus.edu!news
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Moving 500 to 1200, BAD NEWS
- Message-ID: <1992Nov10.011715.1631@msus1.msus.edu>
- From: lkoop@TIGGER.STCLOUD.MSUS.EDU (LaMonte Koop)
- Date: 10 Nov 92 01:17:15 -0600
- Reply-To: lkoop@TIGGER.STCLOUD.MSUS.EDU
- References: <ping.02kd@ping.actrix.gen.nz>
- <OD.6badnetOA92-901-302p0_52d49fb1@piraya.bad.se><1davn7INNfhf@cs.tut.fi>,<H0mXr*h41@dynam.adsp.sub.org>
- Organization: SCS GP/Engineering Cluster
- Nntp-Posting-Host: tigger.stcloud.msus.edu
- Lines: 33
-
- In article <H0mXr*h41@dynam.adsp.sub.org>, jmpor@dynam.adsp.sub.org (Jean-Marc Porchet) writes:
- >In article <1davn7INNfhf@cs.tut.fi>, Kolkka Markku Olavi writes:
- >
- >> In article <OD.6badnetOA92-901-302p0_52d49fb1@piraya.bad.se> Roger_Nordin@atb.bbs.bad.se (Roger Nordin) writes:
- >> >
- >> >Parity checking is a thing from the pre-historic when DRAMs were unreliable.
- >> >Just like MS-DOG (yes, both pre-historic and unreliable :)).
- >
- >Error correction and parity checking is usefull when you have a lot of memory
- >since thre more memory you have the more you increase the probability of a
- >bad read or write in the memory.
-
- To a point. You also increase the amount of parity-devoted RAM as well,
- and when you couple this with the increasing likelihood it as well may
- be problematic, plus the addition of the logic to handle it, it quickly
- begins to become an increasingly small return for the effort.
-
- >> Also, parity checking doesn't _fix_ any memory errors, it only guarantees
- >> that the machine will _crash_ when a memory error happens. Apparently some
- >> people prefer this sort of behavior.
- >
- >with 10 bits you will be able to correct an 1 bit failure and detect a
- >2 bits failure.
-
- True. However, the parity checking method used on PC clones uses one
- bit for the check, making it capable of detecting a one bit failure, and
- unable to make corrections to such problems.
-
- ----------------------------------------
- LaMonte Koop -- SCSU Electrical/Computer Engineering
- Internet: lkoop@tigger.stcloud.msus.edu -OR- f00012@kanga.stcloud.msus.edu
- "You mean you want MORE lights on this thing???"
- ---------------------------------------------------------------------------
-