From: fheschbach@my-dejanews.com Newsgroups: alt.folklore.computers Subject: Sun3/75 RAM error, help? Date: Fri, 15 Jan 1999 09:11:26 GMT Organization: Deja News - The Leader in Internet Discussion Lines: 16 Message-ID: <77n0no$per$1@nnrp1.dejanews.com> NNTP-Posting-Host: 129.13.197.41 X-Article-Creation-Date: Fri Jan 15 09:11:26 1999 GMT X-Http-User-Agent: Mozilla/3.01 [de] (WinNT; I) X-Http-Proxy: 1.0 www-cache.rz.uni-karlsruhe.de:3128 (Squid/2.1.PATCH1), 1.0 x5.dejanews.com:80 (Squid/1.1.22) for client 129.13.130.133, 129.13.197.41 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!isdnet!howland.erols.net!netnews.com!newspeer1.nac.net!news.maxwell.syr.edu!newshub.nntp.mr.net!solomon.io.com!news-feeds.jump.net!nntp2.dejanews.com!nnrp1.dejanews.com!not-for-mail Hello, I have a Sun-3/75M-8 with a single bit RAM error on Memory Expansion Board (501-1122 = 8x18xTMM41256-12). Does anybody know how to determine defective IC from error message (0x20000000)? In other words: which IC stands for which bit? TIA, F.H.Eschbach -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own ###### Path: chonsp.franklin.ch!usenet From: Neil Franklin Newsgroups: alt.folklore.computers Subject: Re: Sun3/75 RAM error, help? Date: 16 Jan 1999 17:39:22 +0100 Organization: My own Private Self Lines: 35 Sender: neil@chonsp.franklin.ch Message-ID: References: <77n0no$per$1@nnrp1.dejanews.com> X-Newsreader: Gnus v5.3/Emacs 19.34 fheschbach@my-dejanews.com writes: > > I have a Sun-3/75M-8 with a single bit RAM error on > Memory Expansion Board (501-1122 = 8x18xTMM41256-12). > > Does anybody know how to determine defective IC > from error message (0x20000000)? I havn't got a Sun3, so interpreting the number will not go, but ... > In other words: which IC stands for which bit? ... there exists an simple experimental method (actually 2): 1. for each RAM chip on board: pull it out try to boot if the "missing bit" error message indicate same bit you have found the broken chip else try next RAM chip 2. alternative variation of above replace "pull it out" with "replace with an new chip replace "error message same bit" with "error message goes away Worked with an broken ET3000 video card on my 286 about 8-10 years ago. -- Neil Franklin, Nerd, Geek, Unix Guru, Hacker, Mystic neil@franklin.ch.remove http://neil.franklin.ch/ Programming: when you stop hammering around on the computer as if it were a piece of dumb matter and instead tell it what to do for you ###### From: genew@vip.net (Gene Wirchenko) Newsgroups: alt.folklore.computers Subject: Re: Sun3/75 RAM error, help? Date: Sun, 17 Jan 1999 04:47:43 GMT Organization: Posted via RemarQ, http://www.remarQ.com - Discussions start here! Lines: 39 Message-ID: <36a16b40.10573022@news.vip.net> References: <77n0no$per$1@nnrp1.dejanews.com> <77rmkf$qd3$1@mermaid.ucc.gu.uwa.edu.au> Reply-To: genew@vip.net NNTP-Posting-Host: 204.209.212.13 X-Trace: 916547822 A01OARAUVD4D CCD1C usenet54.supernews.com X-Complaints-To: newsabuse@remarQ.com X-Newsreader: Forte Free Agent 1.1/32.230 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!newsfeed.berkeley.edu!remarQ73!supernews.com!remarQ69!not-for-mail john@ucc.gu.uwa.edu.au (John "West" McKenna) wrote: >Neil Franklin writes in reply to >fheschbach@my-dejanews.com: > >>> I have a Sun-3/75M-8 with a single bit RAM error on >>> Memory Expansion Board (501-1122 = 8x18xTMM41256-12). > >>> Does anybody know how to determine defective IC >>> from error message (0x20000000)? > >>1. for each RAM chip on board: >> pull it out >> try to boot >> if the "missing bit" error message indicate same bit >> you have found the broken chip >> else >> try next RAM chip >... >>Worked with an broken ET3000 video card on my 286 about 8-10 years ago. > >This is not a practical method for those Sun boards, unless you're >desperate. I'll bet your video card didn't have 144 DRAM chips on it. > >The test gives you the code for a reason, and I'm sure its meaning is >documented somewhere. Sadly, I never found out where. If anyone does have >the docs, please post. So remove a chip and see how the code changes. You might be able to deduce the code from that. Sincerely, Gene Wirchenko Computerese Irregular Verb Conjugation: I have preferences. You have biases. He/She has prejudices. ###### From: Sam Merritt Subject: Re: Sun3/75 RAM error, help? Newsgroups: alt.folklore.computers References: <77n0no$per$1@nnrp1.dejanews.com> User-Agent: tin/pre-1.4-981225 ("Volcane") (UNIX) (FreeBSD/2.2.6-RELEASE (i386)) Lines: 20 Message-ID: <1Seo2.11620$bf6.2854@news1.giganews.com> Date: Sun, 17 Jan 1999 05:49:49 GMT NNTP-Posting-Host: 209.198.128.35 X-Trace: news1.giganews.com 916552189 209.198.128.35 (Sat, 16 Jan 1999 23:49:49 CDT) NNTP-Posting-Date: Sat, 16 Jan 1999 23:49:49 CDT Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!newsfeed.cwix.com!207.207.0.26!nntp.giganews.com!news1.giganews.com.POSTED!not-for-mail fheschbach@my-dejanews.com wrote: > Hello, > I have a Sun-3/75M-8 with a single bit RAM error on > Memory Expansion Board (501-1122 = 8x18xTMM41256-12). > Does anybody know how to determine defective IC > from error message (0x20000000)? > In other words: which IC stands for which bit? http://www.sunhelp.org/faq/sunref4.html (Btw: Sunhelp is a Very Useful Site for things like this) start address 0x00200000 (is 3rd through 6th meg) HTH -- Sam Hayes Merritt, III http://www.frenzy.com/~harter/ ###### From: john@ucc.gu.uwa.edu.au (John "West" McKenna) Newsgroups: alt.folklore.computers Subject: Re: Sun3/75 RAM error, help? Date: 17 Jan 1999 11:49:35 +0800 Organization: The University of Western Australia Lines: 27 Message-ID: <77rmkf$qd3$1@mermaid.ucc.gu.uwa.edu.au> References: <77n0no$per$1@nnrp1.dejanews.com> NNTP-Posting-Host: mermaid.ucc.gu.uwa.edu.au X-Newsreader: NN version 6.5.0 CURRENT #118 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!newspump.monmouth.com!newspeer.monmouth.com!intgwpad.nntp.telstra.net!news1.optus.net.au!optus!news.uwa.edu.au!not-for-mail Neil Franklin writes in reply to fheschbach@my-dejanews.com: >> I have a Sun-3/75M-8 with a single bit RAM error on >> Memory Expansion Board (501-1122 = 8x18xTMM41256-12). >> Does anybody know how to determine defective IC >> from error message (0x20000000)? >1. for each RAM chip on board: > pull it out > try to boot > if the "missing bit" error message indicate same bit > you have found the broken chip > else > try next RAM chip ... >Worked with an broken ET3000 video card on my 286 about 8-10 years ago. This is not a practical method for those Sun boards, unless you're desperate. I'll bet your video card didn't have 144 DRAM chips on it. The test gives you the code for a reason, and I'm sure its meaning is documented somewhere. Sadly, I never found out where. If anyone does have the docs, please post. John West ###### Path: chonsp.franklin.ch!usenet From: Neil Franklin Newsgroups: alt.folklore.computers Subject: Re: Sun3/75 RAM error, help? Date: 17 Jan 1999 22:55:50 +0100 Organization: My own Private Self Lines: 42 Sender: neil@chonsp.franklin.ch Message-ID: References: <77n0no$per$1@nnrp1.dejanews.com> <77rmkf$qd3$1@mermaid.ucc.gu.uwa.edu.au> X-Newsreader: Gnus v5.3/Emacs 19.34 john@ucc.gu.uwa.edu.au (John "West" McKenna) writes: > > Neil Franklin writes in reply to > fheschbach@my-dejanews.com: > > > >1. for each RAM chip on board: > > This is not a practical method for those Sun boards, The algorithm scales linearly with the amount of chips involved :-). > unless you're desperate. Above algorithm may be slow, but it works without docs -> failsafe. > I'll bet your video card didn't have 144 DRAM chips on it. It had 16 256kbit chips, producing the 512kbyte. And of course it was the 16th that produced the black line on the screen :-(. I have also done it on an 72 times 1Mbit (= 8 Mbyte with parity) chip CPU board (386) to find the one chip with one pin bent underneath instead of plugged into the socket. (Ever seen/heard an PC BIOS _screech_ out of the speaker and then switch to CGA 40 char 200 line video on booting?) > The test gives you the code for a reason, and I'm sure its meaning is To make servicing faster; but only for people with docs :-). -- Neil Franklin, Nerd, Geek, Unix Guru, Hacker, Mystic neil@franklin.ch.remove http://neil.franklin.ch/ Programming: when you stop hammering around on the computer as if it were a piece of dumb matter and instead tell it what to do for you ###### From: jnickelsen@acm.org (Juergen Nickelsen) Newsgroups: alt.folklore.computers Subject: Re: Sun3/75 RAM error, help? Date: Tue, 19 Jan 1999 23:46:40 +0100 Organization: [Posted via] Interactive Networx Lines: 10 Message-ID: <1dlukrj.11o3uucr96gw0N@n247-105.berlin.snafu.de> References: <77n0no$per$1@nnrp1.dejanews.com> <77rmkf$qd3$1@mermaid.ucc.gu.uwa.edu.au> NNTP-Posting-Host: n247-105.berlin.snafu.de User-Agent: MacSOUP/2.4 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!newsfeed-zh.ip-plus.net!news.ip-plus.net!news-nyc.telia.net!howland.erols.net!newsfeed.ecrc.net!newsfeed00.btx.dtag.de!newsfeed01.btx.dtag.de!unlisys!news.snafu.de!jnickelsen John "West" McKenna wrote: > This is not a practical method for those Sun boards, unless you're > desperate. I'll bet your video card didn't have 144 DRAM chips on it. I did it with my IBM PC -- 640 KB (enough for everyone) in 64Kbit chips (with parity) == 90 chips. -- Juergen Nickelsen