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27592re: Apple I power issue was Re: [midatlanticretro] Re: Sunday at Maker Faire demontrating the Apple I Mimeo

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  • B. Degnan
    Oct 2, 2012
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      -------- Original Message --------
      > From: "Christian Liendo" <christian_liendo@...>
      > Sent: Tuesday, October 02, 2012 10:13 AM
      > To: "midatlanticretro@yahoogroups.com"
      <midatlanticretro@yahoogroups.com>
      > Subject: Apple I power issue was Re: [midatlanticretro] Re: Sunday at
      Maker Faire demontrating the Apple I Mimeo
      >
      > From: Mike <mike@...>
      > >This is the first time that I have heard of such a problem. Hopefully
      it was the power. Can you describe any triggers.
      >
      > >The only thing similar that I've seen, is problems with end of
      line/carriage return handling. That was fixed by changing a component to
      one with a slower set up time.
      >
      > The unit would randomly generate a _ character. If you left the unit
      alone, you would see _ a lot.
      > Also the power light would fluctuate, which I thought was odd.
      >
      > Yea, I talked with the guys and we agree that a small UPS is the way to
      go, not only for this but if these was a surge or something, at least the
      UPS would take the hit. I rather kill a new UPS..
      >

      Or, it could be that the Apple II keyboard you borrowed has a bad _ key,
      making contact when not wanted. Replace the keyboard, see if that fixes
      the problem (or put the keyboard on an Apple II to see if the same problem
      occurs there too.

      If random characters are appearing on the screen after many hours of use,
      you have an IC that is farting out. Don't use until fixed. replace things
      like the 7805, etc. Normal, even abnormal power fluctuations shouldn't
      cause the _ key to start firing, an no other symptoms.

      BD
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