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Re: AppleColor Composite Monitors discussion
ferdimh@gmx.de wrote:
I found out that (at least in Germany) many TV sets switch the luma
channel to high bandwith if there is no color signal. This seems to be
true for multisystem units or units with multisystem decoder chips
that are limited to PAL by other means.
I've got a 14" Lifetec and a 12" Samsung with nearly the same circuit
board. Both have multisystem decoders where the 3,58 MHz crystal
needed for NTSC mode is missing. In the 14" Lifetec I've added a
3,58MHz crystal and got a nice monitor for my Apple //e. They have a
bandwith way above 7MHz.
That's interesting. I have never seen an analog NTSC set that
switched its luminance bandwidth in monochrome mode--except for
the AppleColor Composite monitor, that is.
I'm glad to hear that this was more common in PAL monitors.
I'm afraid that for many years, the driving force in the design of
NTSC TV receivers (and NTSC monitors) for the US consumer market was
low price, not high quality. ;-(
And a friend of mine has a Panasonic 21" multisystem TV which provides
an image which is as good as on a green-screen monitor. I don't know
which picture tube is used but it doesn't seem to be a real TV tube.
One can actually count the scanlines!
Actually, on any NTSC monitor (even low quality), as long as the
vertical sweep is stable, a non-interlaced raster will have clearly
visible scan lines. Many sets with larger CRTs have clearly visible
scan lines even with interlace. (The beam size on larger CRTs is not
much larger than on smaller CRTs--as a result, some large high-quality
sets actually dithered the beam vertically at a very high frequency
to "widen" the beam to eliminate black spaces between the scan lines.)
I've seen some more, e.g. one Grundig 26" set, which provides readable
80-col text.
Again, kudos to the designers for the European market.
Of course, now that sets are digital, it diesn't add components to
provide these features for everyone. ;-)
-michael
NadaPong: Network game demo for Apple II computers!
Home page: http://members.aol.com/MJMahon/
"The wastebasket is our most important design
tool--and it's seriously underused."