[Coco] Upgrading RAM for CoCo 1

[Don Akins]

Thanks for all the advice and guidance guys. I really like this CoCo mailing
list!

> 
>     On April 25, 2015 at 9:21 AM Zippster <zippster278 at gmail.com> wrote:
> 
> 
>     Don,
> 
>     If you haven’t done so yet, definitely pull all the socketed chips in the
> CoCo and reseat them.
>     Machines that have been sitting a long time often develop contact problems
> that are easily fixed this way.
> 
>     I just had a machine the other day with no sound. Reseated the appropriate
> chips, and now everything works.
> 
>     Very common issue.
> 
>     - Ed
> 
> 
> 
>     > On Apr 25, 2015, at 8:15 AM, Dave Philipsen <dave at davebiz.com> wrote:
>     >
>     > It's probably just corrosion or whatever. If you had arcing like that
>     > across the pins on your DRAM chips you've got bigger problems. Other
>     > than the power supply pins, the signal pins on the RAM chips carry very
>     > little power. Definitely not enough to cause arcing.
>     >
>     > Dave Philipsen
>     >
>     >
>     > On 4/25/2015 7:37 AM, Don Akins wrote:
>     >> Ahh, thanks for the info. What made me think the chips were bad is that
>     >> they
>     >> have scarring on the pins of some of them as if they arced from a
>     >> short.
>     >>
>     >>> On April 25, 2015 at 12:20 AM Arthur Flexser <flexser at fiu.edu> wrote:
>     >>>
>     >>>
>     >>> You realize that it's normal for PRINT MEM to show something like 8K
>     >>> in a
>     >>> 16K CoCo? (PRINT MEM is only showing the memory available for Basic
>     >>> programs, which doesn't include 8K or so reserved for the operating
>     >>> system. I think 8487 is what you should see with Extended Basic). If
>     >>> you
>     >>> had bad RAM chips, the CoCo likely would show garbage on screen if it
>     >>> booted up at all.
>     >>>
>     >>> Art
>     >>>
>     >>> On Fri, Apr 24, 2015 at 10:19 PM, donald at dra.space donald at dra.space <
>     >>> donald at dra.space> wrote:
>     >>>
>     >>> > Hi Guys,
>     >>> >
>     >>> >
>     >>> > I recently bought a silver CoCo 1 and when I booted it up it only
>     >>> > recognized 8k
>     >>> > ram out of 16k. So I opened it up and noticed that some of the ram
>     >>> > chips
>     >>> > appeared to have burnt out. The motherboard has jumpers for 64k so
>     >>> > this
>     >>> > board
>     >>> > must be one of the later revisions of the CoCo 1. I pulled one of
>     >>> > the
>     >>> > chips I
>     >>> > out which is a 4116N-3GP. Are there any equivalent 64k chips out
>     >>> > there
>     >>> > today for
>     >>> > a CoCo 1?
>     >>> >
>     >>> >
>     >>> > Don
>     >>> >
>     >>> > --
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>     >>> >
>     >>>
>     >>> --
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>     >>>
>     >
>     >
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> 
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