Post by Doug Dingus
Old display chatter mode = 1
Post by Michael J. Mahon
Luminance bandwidth of consumer TVs was limited to about 3MHz by the chroma
subcarrier filter. This was actually seen as desirable, since it made solid
color areas look uniform rather than “dotted”.
Later models, beginning in the later 80's began to open wide up.
Broadcasts pushed it all too. I remember seeing TV graphics jump a
resolution, from something roughly 320 to roughly 640, with the TV's able
to employ better filters, "comb filter" comes to mind, to produce sharper
images. An old indie station here stayed with simpler graphics well into
the 90's and it was notable. I would look for the sets that showed the
dot pattern, being just well executed, sharp circuits and CRT's, sans the
filtering and such, and use them for games / computer use. Some people
don't mind and seem to process the dots away.
Late 80's and most 90's era TV circuits ended up better than the CRT they
were driving too. During that time period, one could get a smaller pitch
masked CRT and upgrade a TV and notice! My personal set was a Zenith,
hybrid. My fave TV ever! Had a vacuum tube H / V drive, transistor and
IC circuits elsewhere. It was a 27" model, and I completely redid it
with a 17" CRT that had basically a 2X finer pitch. When I got done, it
was a full frame display, PVM "underscan" style. What I liked most about
it was a pretty low noise color circuit, and it would widen right up.
Performance was close to many of the better pictures in this thread, and
rock solid stable.
The smaller CRT, and setup full frame made converging it near spot on.
Took a long time, but it was worth it at the time. Being able to read 80
columns and get a great color display was expensive for this rural kid.
Doing CRT setups and alignment was fun at the time. Like a puzzle. The
more you put in, the better it looks. Then it all fades after a couple
years, and do it again... I don't miss the do it again part.
The other thing I noticed was increasingly better art direction as we
moved to DVD media and really began to get signals into the home that
were better than the TV's and or many broadcasts. Luma changes at higher
resolution, color changes at somewhat lower pushed NTSC right to the
edge. Anyone connecting a DVD to S-video or component / RGB got the big
jump, and watching movies on a CRT was kind of golden for a time. That
"dotted" look got filtered and processed away some. Would be super
interesting to compare some sets and broadcasts from 70's, 80's and 90's.
The improvements were pretty dramatic! That's the "retro" look many are
seeking today. It's distinctive.
Post by Michael J. Mahon
The Apple Color Composite monitor bypassed the chroma filter when in
monochrome mode, so that 80-column text would be readable.
Cool. On my "custom" Zenith, I set the color killer trigger right to the
edge, and it basically did the same thing. Doing that meant marginal
broadcasts ended up black and white. At the time, I didn't care much.
The computer was where it's at! Many TV's included that particular
adjustment, and it was set to permit color more than not to avoid "but
it's not in color" calls on marginal signals. One difference is I
basically widened the set up. That "dot" or "line" look actually appeals
and in my view, is a big part of what makes great Apple graphics art
great! The photo Tempest put here of the PoP title screen is an exemplary example.
On that note, older B&W broadcasts were sharper than we often see them
today. That 3.58Mhz knocked what was roughly 500'ish lines down to
roughly 300'ish lines. Old programs broadcast in mono looked crazy sharp
on a set designed for them. I got to experience this a few times as a
younger kid and it always stuck with me. Grandparents had an absolutely
huge monochrome TV. It was fun to watch. Honestly, that thing would
have done the 80 column text no problem. Hard to find those now. If I
did find one, I would totally convert it for gaming! Great phosphors, will leave trails.
Old Display Chatter Mode = 0
resolution boost over color monitors without a more expensive comb filter.
The best sets were the very early models and the expensive late models. The
cheap sets of the 1960s were only worth what you paid for them.
“lab-derived” circuit with no shortcuts. It even had separate video and
monitors, typically connected using a UHF modulator. As a result, the most
seen on a mid-range period monitor (or its emulation).