Re: IIgs Monitor Repair

[ferdimh@gmx.de]

On 10 Jan., 22:43, "Michael J. Mahon" <mjma...@aol.com> wrote:
>
> Right.  It's a shame that digital TVs have become so intolerant
> of distorted or non-standard signals.  It's not really that hard
> to make the sync algorithm adaptive...
>
> I still remember the original RCA 630TS color receiver--it would
> sync solidly to a signal with such low signal-to-noise ratio that
> you could barely make it out in the "snow"!  Of course, it had 30
> tubes, too.  ;-)
>
> "Analog emulation" would be a nice mode for digital TVs.  ;-)
>
Not a good idea... They would blur the picture and wouldn't fix their
sync problems.
BTW, Grundig used analog sync and color decoders before a digital
double-scan is performed...
This yields a picture quality I've never seen on a double-scan TV.
I don't think an analog sync decoder is very expensive.
BTW, why do many color TVs choose the color system based on the
vertical refresh rate?! I have seen that many times with a multisystem
TV on a 50Hz Apple. If it is forced to NTSC it will work. Otherwise it
won't.
Another think is the extreme sensivity of today's color TVs. Why did
they turn it up that far?! The TV I use on the Apple ][ syncs to 10mV
color burst. The problem is, that such a low level is always present,
even in text mode. This will cause VERY annoying color patterns in
text mode, much worse than the little green/violet shadows. I solved
it by detuning the Apples oscillator so that the TV won't lock to it
anymore.

-------
Ferdinand