[Coco] CoCo2 vs CoCo3 changes

Wed Jul 18 15:00:52 EDT 2018

Thanks Kevin - enjoy the projects! 

    On Wednesday, July 18, 2018 2:51 PM, Kevin Becker <kevin at kevinbecker.org> wrote:

 I ordered two sets from you.  One for my new CoCo 3 and one for my CoCo 2
which seems fine but I'm sure they will need replacing at some point

On Wed, Jul 18, 2018 at 2:24 PM, Michael Kent <mikekent at bellsouth.net>
wrote:

> Thanks for the link Ed - I am the seller of the caps
> Starting to get excited about your new products - any updates?
> Any more VGA's on the way!?
>
>    On Wednesday, July 18, 2018 2:03 PM, Tim Fadden <t.fadden at cox.net>
> wrote:
>
>
>  Electrolytic caps have a finite life span, being used or not. Visible
> signs are hard to spot. Newer caps have stress cuts on the top, that let
> the cap buldge as it gets bad which is one sure sign. Leaking can be a
> sign, but it could just be goo that was put on there to glue them down.
> If you have a scope, or a good volt meter, you could look for ac ripple
> on the power side. In my opinion, electrolytic caps over 20 years are
> just a bomb waiting to go off. I bought two of those kits and changed
> mine for good measure.
>
> On 7/18/2018 10:52 AM, Jack Carpenter via Coco wrote:
> > What are the sign of capacitor going bad?
> >
> >
> >      On Wednesday, July 18, 2018, 5:36:26 PM GMT, Kevin Becker <
> kevin at kevinbecker.org> wrote:
> >
> >  Thanks!  I thought I had seen them somewhere but I didn't think to check
> > eBay.
> >
> > On Wed, Jul 18, 2018 at 1:26 PM, Zippster <zippster278 at gmail.com> wrote:
> >
> >> Someone on eBay has apparently.  Not sure the link will survive the list
> >> processing, but…
> >>
> >> link <https://www.ebay.com/itm/TRS-80-Tandy-Color-Computer-2-
> >> Tandy-Color-Computer-3-Capacitor-Replacement-Kit/232472882664?hash=
> >> item362076ade8:g:~ocAAOSwmhJZqwGI:sc:USPSFirstClass!55021!US!-1&_
> >> sacat=0&_nkw=trs80+computer+capacitor+kit&_from=R40&rt=nc&
> >> LH_TitleDesc=0%7C0>
> >>
> >> - Ed
> >>
> >>
> >>> On Jul 18, 2018, at 12:14 PM, Kevin Becker <kevin at kevinbecker.org>
> >> wrote:
> >>> I don't suppose anybody has put together a CoCo3 capacitor kit to make
> it
> >>> easy to order them all at once?
> >>>
> >>> On Wed, Jul 18, 2018 at 1:11 PM, Zippster <zippster278 at gmail.com>
> wrote:
> >>>
> >>>> Sounds like an electrolytic cap possibly.  Look at C54, a 470uF ac
> >> coupling
> >>>> cap for the composite out as a possible suspect.
> >>>>
> >>>> Any electrolytics in the signal paths I would swap out at this point
> >> just
> >>>> to eliminate
> >>>> them.  They usually work, but are way past their expected service life
> >> at
> >>>> this point.
> >>>>
> >>>> - Ed
> >>>>
> >>>>
> >>>>> On Jul 18, 2018, at 12:06 PM, Kevin Becker <kevin at kevinbecker.org>
> >>>> wrote:
> >>>>> At first the composite video was very wavy and noticeably worse than
> RF
> >>>>> input but that seemed to clear up after it warmed up, strangely.  At
> >> one
> >>>>> point composite seemed to stop working at all but it came back after
> a
> >>>> few
> >>>>> power cycles and swapping TV inputs a few times.  After giving up on
> >>>> CoCo 3
> >>>>> games I tried Buzzard Bait, which I knew worked on my CoCo 2, and I
> >> could
> >>>>> hear it playing but the screen wasn't updating and was a little out
> of
> >>>>> whack.  When I went back to RF Buzzard Bait played fine.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Wed, Jul 18, 2018 at 12:56 PM, rietveld rietveld <
> >>>> rietveldh at hotmail.com>
> >>>>> wrote:
> >>>>>
> >>>>>> 'composite issues '?  ‎Does it display in a semi black and white?  I
> >>>>>> found that my coco3 and Dragon 64 both have display issues with
> >> certain
> >>>>>> tv/monitors that use comp in.  Some work perfectly others didn't
> >>>>>>
> >>>>>> Sent from my BlackBerry 10 smartphone.
> >>>>>> Original Message
> >>>>>> From: Kevin Becker
> >>>>>> Sent: Wednesday, July 18, 2018 11:10 AM
> >>>>>> To: CoCoList for Color Computer Enthusiasts
> >>>>>> Reply To: CoCoList for Color Computer Enthusiasts
> >>>>>> Subject: Re: [Coco] CoCo2 vs CoCo3 changes
> >>>>>>
> >>>>>>
> >>>>>> Thanks, these look great.
> >>>>>>
> >>>>>> Apparently my new CoCo 3 isn't working so well though so it may be
> >> some
> >>>>>> time before I really get to dig into it.  I plugged it in last night
> >> and
> >>>>>> had a lot of weird composite video issues.  Maybe it just doesn't
> like
> >>>> my
> >>>>>> TV.  The RF output seems to work fine.  I haven't been able to
> >>>> successfully
> >>>>>> run any CoCo 3 software either though.  It seems to crash or not
> load
> >> at
> >>>>>> all.  I did run a memory test successfully so I've got some digging
> to
> >>>> do
> >>>>>> to figure out what is going on.
> >>>>>>
> >>>>>> On Wed, Jul 18, 2018 at 7:22 AM, Frank Swygert <farna at amc-mag.com>
> >>>> wrote:
> >>>>>>> On 17/7/2018 14:02, Kevin Becker wrote:
> >>>>>>>> So I finally broke down and bought a CoCo 3 on eBay.  It arrived
> >> today
> >>>>>>> but
> >>>>>>>> I haven't had a chance to try it out yet since I'm at work.  It
> >>>>>> suddenly
> >>>>>>>> occurred to me though that I don't actually know that much about
> the
> >>>>>> CoCo
> >>>>>>>> 3.  I had a CoCo 2 back in the 80s and I bought a CoCo 2 last
> winter
> >>>>>> that
> >>>>>>>> I've been having fun with.
> >>>>>>>>
> >>>>>>>> I know it has more RAM, different keyboard layout, composite and
> RGB
> >>>>>>>> video.  I know the GIME provides better graphics.  Anything else I
> >>>>>> should
> >>>>>>>> know?  I'm especially curious about the MicroWare additions to
> BASIC
> >>>> to
> >>>>>>>> support the improved graphics.  Should I just RTFM or is there any
> >>>> sort
> >>>>>>> of
> >>>>>>>> quickstart list of things to know for someone upgrading from CoCo
> 2
> >> to
> >>>>>> a
> >>>>>>>> CoCo 3?
> >>>>>>> =========================================
> >>>>>>>
> >>>>>>> The "Unravelled" series of books for all three CoCos are in the
> link
> >>>>>>> below. You might want to start with the "Super Extended BASIC
> >>>> Unravelled"
> >>>>>>> to see how all the new commands work.
> >>>>>>> http://www.colorcomputerarchive.com/coco/
> Documents/Books/Unravelled%
> >>>>>>> 20Series/
> >>>>>>>
> >>>>>>> This should help also. Was printed right after the CoCo3 came out:
> >>>>>>> http://www.colorcomputerarchive.com/coco/
> Documents/Books/Coco%20III%
> >>>>>>> 20Secrets%20Revealed%20(Microcom%20Software).pdf
> >>>>>>>
> >>>>>>>
> >>>>>>> --
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> >>>>>>>
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> >>
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>
> --
> Tim Fadden
> "Hey Schmidt, don't forget about the six P's.
> Proper Preparation Prevents Piss-Poor Performance!"
>
>
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>
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