budler@eda.com (Jim Budler) (03/15/90)
My Antique Mac has developed a fibrillated clock. It jumps to random other
era's, or dies completely February 6, 1940 at 6:28:15 AM.
I took the CPU board out, and ran the computer while watching and waiting
for this to reoccur.
The chip stops dead... This could be the $0.39 crystal, but I
suspect it's probably the clock chip itself.
The problem is I can't identify it, let alone find a source for it.
It's a little 8 pin with the numbers 8504 on it, but that looks suspiciously
like a date code to me.
Does anyone know what this chip is, and hopefully, where I could get one?
Thanks,
jim
--
Jim Budler jim@eda.com ...!{decwrl,uunet}!eda!jim
Digital Equipment Corporation, EDA Systems Group
compuserve: 72415,1200 applelink: D4619
voice: +1 408 986-9585 fax: +1 408 748-1032tejtemw@isis.educ.lon.ac.uk (EARL WILLIAMS) (03/16/90)
In article <1990Mar15.070202.1914@eda.com> budler@eda.com (Jim Budler) writes: >My Antique Mac has developed a fibrillated clock. It jumps to random other >era's, or dies completely February 6, 1940 at 6:28:15 AM. Sounds like your battery has run dead. The clock chip is probably fine. In order to keep time while the power to the Mac is off, there is a little battery inside your case. When it dies, your clock starts "fibrillating." The clock time is just one of several values which are stored in PRAM and sustained by this battery. -- Earl M. Williams ?8^) "No matter where you go, there you are." Inst. of Education, U. of London -Buckaroo Banzai INTERNET/JANET: tejtemw@isis.educ.lon.ac.uk "When in doubt, lay it out." BITNET: tejtemw%<same>@ukacrl.bitnet -Captain Ultimate [Frisbee]
jim@eda.com (Jim Budler) (03/17/90)
tejtemw@isis.educ.lon.ac.uk (EARL WILLIAMS) writes: >In article <1990Mar15.070202.1914@eda.com> budler@eda.com (Jim Budler) writes: >>My Antique Mac has developed a fibrillated clock. It jumps to random other >>era's, or dies completely February 6, 1940 at 6:28:15 AM. >Sounds like your battery has run dead. The clock chip is probably fine. In >order to keep time while the power to the Mac is off, there is a little >battery inside your case. When it dies, your clock starts "fibrillating." Sigh... No. I can read a voltmeter and an oscilloscope. Either the clock chip or it's crystal is bad. I have a new crystal, but was hoping to find a clock chip before cracking the case again. jim -- Jim Budler jim@eda.com ...!{decwrl,uunet}!eda!jim Digital Equipment Corporation, EDA Systems Group compuserve: 72415,1200 applelink: D4619 voice: +1 408 986-9585 fax: +1 408 748-1032
Michael.Burton@p3.f200.n226.z1.FIDONET.ORG (Michael Burton) (03/19/90)
Jim Budler writes: > My Antique Mac has developed a fibrillated clock. It jumps to random > other era's, or dies completely February 6, 1940 at 6:28:15 AM. > ... > The chip stops dead... This could be the $0.39 crystal, but I > suspect it's probably the clock chip itself. Have you checked your battery? -- Michael Burton via cmhGate - Net 226 fido<=>uucp gateway Col, OH UUCP: ...!osu-cis!n8emr!cmhgate!200.3!Michael.Burton INET: Michael.Burton@p3.f200.n226.z1.FIDONET.ORG