briang@sdd.hp.com (Brian Gragg) (10/14/90)
Hi all,
I've got a problem and I'm looking for help. My A500 clock (internal) is
jumpping backwards every couple of minutes. The battery backed up clock
keeps time just fine. But once the time has been loaded from there, the
A500 can't seem to keep track.
Symptom: 1. Every minute to two, the clock jumps backwards by 15 to 50
seconds or more.
2. When I recycle power the clock comes up OK, but quickly
starts with symptom #1. Even after being off for a while.
System: A500, Xetec SCSI hard drive & ram expansion. Otherwise plain.
Please reply to me. It doesn't make my system inoperable, but I'm very
concerned. Virusx 4.0 says no virii present, but who knows!
Thanks much (in advance)
Brian.
--
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Brian Gragg briang@sdd.hp.com hp-sdd!briang uunet!ucsd!hp-sdd!briang
-----------------------------------------------------------------------------bj@cbmvax.commodore.com (Brian Jackson) (10/14/90)
In article <1990Oct13.220412.26145@sdd.hp.com> briang@sdd.hp.com (Brian Gragg) writes: > I've got a problem and I'm looking for help. My A500 clock (internal) is > jumpping backwards every couple of minutes. The battery backed up clock > keeps time just fine. But once the time has been loaded from there, the > A500 can't seem to keep track. > Symptom: 1. Every minute to two, the clock jumps backwards by 15 to 50 > seconds or more. > 2. When I recycle power the clock comes up OK, but quickly > starts with symptom #1. Even after being off for a while. > Thanks much (in advance) > Brian. > As I mentioned in mail to you, my machine started doing this at almost the same time that yours did. Today I replaced the two 8520 chips in the thing and all is back to normal. So that could be a hint. :) I'm not a hardware guy so I offer no explanations; only what solved it for me. bj ------------------------------------------------------------------------ | Brian Jackson Software Engineer @ Commodore-Amiga Inc. GEnie: B.J. | | bj@cbmvax.commodore.com or ...{uunet|rutgers}!cbmvax!bj | | "Kill a small animal, drink a lite beer." - R.Williams | ------------------------------------------------------------------------
sdl@linus.mitre.org (Steven D. Litvinchouk) (10/15/90)
In article <1990Oct13.220412.26145@sdd.hp.com> briang@sdd.hp.com (Brian Gragg) writes: > Hi all, > I've got a problem and I'm looking for help. My A500 clock (internal) is > jumpping backwards every couple of minutes. The battery backed up clock > keeps time just fine. But once the time has been loaded from there, the > A500 can't seem to keep track. > Symptom: 1. Every minute to two, the clock jumps backwards by 15 to 50 > seconds or more. > 2. When I recycle power the clock comes up OK, but quickly > starts with symptom #1. Even after being off for a while. > System: A500, Xetec SCSI hard drive & ram expansion. Otherwise plain. I had exactly the same problem with my Amiga 2000. It turned out to be a hardware problem--a bad 8520 (???) chip, I think. The repair person at the dealership I took the machine to (Memory Location/Wellesley MA) thought it looked like such a neat effect that he decided to save the bad chip to demo the effect to some local user group! -- Steven Litvintchouk MITRE Corporation Burlington Road Bedford, MA 01730 (617)271-7753 ARPA: sdl@mbunix.mitre.org UUCP: ...{att,decvax,genrad,necntc,ll-xn,philabs,utzoo}!linus!sdl "Where does he get those wonderful toys?"
wilde@boulder.Colorado.EDU (Nick Wilde) (10/15/90)
In article <15146@cbmvax.commodore.com> bj@cbmvax.commodore.com (Brian Jackson) writes: >In article <1990Oct13.220412.26145@sdd.hp.com> briang@sdd.hp.com (Brian Gragg) writes: >> I've got a problem and I'm looking for help. My A500 clock (internal) is >> jumpping backwards every couple of minutes. The battery backed up clock >As I mentioned in mail to you, my machine started doing this at almost the >same time that yours did. Today I replaced the two 8520 chips in the thing >and all is back to normal. So that could be a hint. :) I'm not a hardware guy Mine has had the same problem for a while now. So will some kind person explain to me: What an 8520 chip is. Where I find it in my B2000 Where I find new ones. How I go about replacing the old ones. Thanx - Nick ------------------------------------------------------------------------------- Nick Wilde wilde@boulder.colorado.edu
Patrick Atoon (10/15/90)
Nick Wilde writes: > [...lotsa clock problems, 8520 to blame for it...] >Mine has had the same problem for a while now. So will some kind person >explain to me: >What an 8520 chip is. It's the chip that smokes most often in your computer, otherwise known as the CIA-chip. You have two of those chips in your computer, they handle most of the ports on the back of your Amiga (Serial, Parallel, Joystick). They also seem to handle the clock. They also handle your diskdrive. I don't know why, but most of my friends having trouble with their Amiga say only one word to me: 8520 (By the way... my own 8520 is also broken 8-( ). Maybe it's because they are connected to the ports without (?) a buffer to protect them. I dunno, this is pure speculation. There must be a reason why these chips break down this easily. Maybe Commodore should find some kind of replacement for these chips. >Where I find it in my B2000 Dunno, I got a 500. In a 500 they are near to the ports and the diskdrive (in the upper right corner). >Where I find new ones. You can order them in any electronics-shop (At least, here in the Netherlands) >How I go about replacing the old ones. If you still got warranty on your computer, let your dealer do it for you (will cost you, however). If you got no warranty, open your 2000, find the chips, take 'em out (really simple) and put the new ones in (maybe you only need to change ONE chip...). Don't put the chips in the wrong direction... (watch the hole in the chip). That should do the trick. >Thanx - Nick No sweat, Patrick +--------------------------------------------------------------------------+ | Patrick Atoon | See y'all at Amiga'90 in Koeln (Germany) | | University of Nijmegen | on 8,9,10,11 november. Be there or be square. | | E-mail: ovb10@cs.kun.nl | | +-------------------------+------------------------------------------------+
jcs@crash.cts.com (John Schultz) (10/21/90)
In article <1990Oct13.220412.26145@sdd.hp.com> briang@sdd.hp.com (Brian Gragg) writes: > >Hi all, > I've got a problem and I'm looking for help. My A500 clock (internal) is > jumpping backwards every couple of minutes. The battery backed up clock Someone from the future is playing games with your Amiga: Your Amiga has been in the future, and returned to your present time. "A computer so advanced, people from the future travel to the past to use it." Read the book "Millenium", or rent the film for descriptions of clock phenomenon. John