[chbot] CNC and HC11 crash

[Mark Atherton]

a new measurement of distance, excellent :)

6809 was almost my fav CPU, where RTS could also be implemented using 
something like JMP [SP++]







At 01:48 p.m. 3/02/2014, you wrote:
>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 
><<mailto:markaren1 at xtra.co.nz>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
>
>
>
>
>_______________________________________________
>Chchrobotics mailing list 
><mailto:Chchrobotics at lists.linuxnut.co.nz>Chchrobotics at lists.linuxnut.co.nz
>http://lists.ourshack.com/mailman/listinfo/chchrobotics
>Mail Archives: 
><http://lists.ourshack.com/pipermail/chchrobotics/>http://lists.ourshack.com/pipermail/chchrobotics/
>Web site: <http://kiwibots.org>http://kiwibots.org
>Meetings 3rd Monday each month at Tait Radio Communications, 175 
>Roydvale Ave, 6.30pm
>
>When replying, please edit your Subject line to reflect new content.
>
>
>_______________________________________________
>Chchrobotics mailing list Chchrobotics at lists.linuxnut.co.nz
>http://lists.ourshack.com/mailman/listinfo/chchrobotics
>Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
>Web site: http://kiwibots.org
>Meetings 3rd Monday each month at Tait Radio Communications, 175 
>Roydvale Ave, 6.30pm
>
>When replying, please edit your Subject line to reflect new content.