Re: PET 50Hz vs. 60Hz screens?

From: Groepaz <>
Date: Fri, 21 Dec 2012 18:09:33 +0100
Message-Id: <>
On Friday 14 December 2012, you wrote:
> The question is, what is a "valid" timing?
> Can an originally 60Hz screen run with a 50Hz timing and vice versa?
> (I'm not talking about the line frequency here)

thats really hard to answer without knowing hard technical facts about the 
screen :) depending on manufacturer this kind of info is written on the 
backside even, or maybe on the board (certainly its mentioned on the schematic 
that you can find in lots of old TV sets).

practically i'd say however that any monochrome screen of that time can sync 
to both 50 and 60 hz. if in doubt try it out =)
> The question is, can say a 50Hz program or demo run on a 60Hz machine, by
> just reprogramming the CRTC appropriately, without damaging the screen?

although in theory it is possible to damage the screen with improper timing - 
it is more than unlikely this will happen because of 50 vs 60 hz - personally 
i would ignore this "problem" alltogether :) if it makes funny noise, just 
switch it off quickly though =P


Mein Humor ist so elitär wie euer Gehabe!

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Received on 2012-12-21 18:00:12

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