[Coco] CoCo2 vs CoCo3 changes

[Jack Carpenter]

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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> >>
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