[chbot] CNC and HC11 crash

[Charles Manning]

They're 6809, not 'lls. Thus the teeth are longer by 1985 - 1878 = 7 years.


On Mon, Feb 3, 2014 at 1:30 PM, Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Hi Wallace,
>
> From what you said it sounds like your setup is now much more sensitive to
> electrical disturbances than it was a few years ago.
>
> Given that the CPU is an HC11, that dates the system to about 1995-ish
> vintage, so the power supply is possibly linear, and the electrolytic
> capacitors have had a good chance to dry out. Maybe a good start would be
> to replace all electro caps with brand new, fresh off the shelf parts (not
> new, old stock).
>
> What type of welder do you have ? Charles mentioned large inductive loads,
> back EMF etc. and that was certainly true back-in-the-day, but newer TIG
> and MIG welders are usually based on Switched mode technology, and some
> even have power factor correction. How old is the welder, how heavy is it
> (Iron, or SMPSU ?)
>
> Migration of atoms. Yup, certainly possible with the sub 23nm(?)
> geometries, but HC11 technologies are an order (or two) of magnitude
> larger, and more resilient. My experience is that if it works, then it's OK
> - certainly with SSI and MSI parts (good old HC, and TTL parts).
>
> Carefully placed ferrites (usually only in the signal lead, not ground
> return) may help.
>
> Try and suppress problems at the source, and see if you can find a small
> noise source that makes things lock up -- I used to have a mains electric
> razor without suppression caps, great for tracking down noise paths into
> products.
>
> And the electro caps, as I said, might be a good start.
>
> -mark
>
>
>
>
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