Re: IIgs RGB to VGA experiment

js@xxxxxxxxxxx wrote:
Yes, I understand. The lines are produced by video pulses that are multiples of 70 ns. HGR pulses, for example, are 140ns wide, which will look pretty chunky on a hi-res display. I was just saying that it's *not* the monitor, it's the Apple video.


I see what you're saying. So you advocate a small monitor only to
reduce the pixelation effect we can perceive.

Right--or sit further back from the large display. ;-)

Then you are golden. All Apple display modes except SHR are composed
of pulses of a 14MHz clock, and so are multiples of 70ns. If you
translate 70ns to displayable monitor pixels in 39+ microseconds,
it works out to 750 pixel resolution across the whole horizontal
line. In the 640x? case, it works out to 858 pixels across the
whole line.


It occurred to me that the real problem in figuring out all this video
stuff is that these d**n manufacturers don't put any but the most
primitive specs in their manuals. Some are better than others, but
the worst are shameful (Samsung televisions). If all the needed specs
were there, all these questions would have self-evident answers and it
would be easy to match a monitor to a need.

I agree that most digital monitors are quite incompletely specified.
One might expect HD monitors to be better, but in many cases it is
worse.

I expect this is for marketing reasons, since many high-priced displays
would not win any "pixel wars". I find it ridiculous, for example, that
a display listed as "1080i" would have a pixel resolution of only 1366x768, which is clearly far less than the 1920x1080 that one might
reasonably expect.

In the TV world, larger displays are generally not higher-resolution
displays. Virtually all plasma displays are stuck at 1366x768 or less.

There is a special irony that now large screen LCD displays are matching
the plasma resolutions, rather than going for 2000+ horizontal pixels.
I'm sure this improves their yields slightly, but it certainly doesn't
meet the expectations of someone familiar with computer monitors!

Also insane are the number of video standards in use.. format or
physical connection. I think the maxim applies: the more confusion
you have, the more jobs it creates.

There are at least two quite different motives operating here.

The first motive is to find a small, convenient cable and connector for
very high resolution digital video signals.

The second motive is to make sure that high resolution digital video
for Hollywood movies doesn't pass over a non-authenticated, non-
encrypted link! (We're *surrounded* by pirates, don' cha know... ;-)

Interestingly, the latter motive is succeeding in artificially limiting
the bandwidth (resolution) of any video sent over an *analog* link, like
VGA or component, to 720 pixels horizontally (DVD resolution), also to
prevent piracy through the "analog hole"!

All I can say is, there's going to be a robust black market in devices
that don't impose all the limitations required by the MPAA.

BTW, all the confusion and restrictions coming down the pipe are really
turning off regular customers--the folks who made the DVD the fastest
media transition in consumer electronics history. Expect to see a real
slowdown in the market as prople begin to internalize all the wierdness
that's being offered for sale (like BluRay vs. HD video discs).

-michael

Parallel computing for 8-bit Apple II's!
Home page: http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it is seriously underused."
.

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