Re: PET 50Hz editor ROMS

Date: Fri, 08 May 2015 21:28:35 +0200
Message-ID: <3831323.Em2zi3AftD@rakete>
On Friday 08 May 2015, 22:21:49 Marko Mäkelä <> wrote:
> On Fri, May 08, 2015 at 04:51:47PM +0000, William Levak wrote:
> >>For minimal interferences only the vertical sync is defined to the
> >>frequency of the main power.
> >
> >I looked at the schematics for the vertical drive circuit.  It is
> >driven entirely from 12 V DC and the sync signal from the system
> >board. So, it would not be affected by different line frequency.
> I think that Martin meant interference between the CRT display and
> ambient lighting, such as fluorescent tubes or tungsten bulbs. I do not
> know, but it might be that the screen would seem to flicker if the
> lights flickered at 50Hz (or 100Hz) while the screen is flickering at
> 60Hz.

exactly - iirc that was even mentioned in some technical doc back in the days.


Universitäten sind schöne Misthaufen, auf denen gelegentlich einmal eine edle 
Pflanze gedeiht. 
<Albert Einstein>

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Received on 2015-05-08 20:00:50

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