Re: IIGS -> VGA: Success!

[mjmahon@aol.com (Michael J. Mahon)]

Jim Maricondo replied:

>"Michael J. Mahon" <mjmahon@aol.com> wrote in message
>20020816161847.25039.00001054@mb-md.aol.com">news:20020816161847.25039.00001054@mb-md.aol.com...
>> Jim, how would you characterize the display quality relative to
>> the IIgs Apple RGB display?
>
>I must admit I am being a perfectionist.  It's hard for me to accept
>anything less than perfect video quality, especially when my LCD screen
>usually displays such crisp images from my PC video card, in both VGA and
>DVI input modes!
>
>The image quality actually is pretty good, even with the XRGB-2plus.
>However it's definitely better with the XRGB-2, just like the guy in that
>XRGB-2plus review states when he slams the "dot clock" on the plus model.
>The way I understand it is that the XRGB-2/plus digitize the incoming video
>signal and then upscan it and reoutput it to VGA/XVGA.  Guess with all these
>ADC/DAC conversions a bit of noise gets introduced.  But it's not that bad,
>and even less so on the non-plus.
>
>I have taken a bunch of photos but need a bit more time to post them to the
>web.

The photos may help, but it's hard to do an A-B comparison when the A
is missing!  ;-)

In this case, the A from which we all start is the normal Apple RGB monitor
for the IIgs.

I really don't expect to see any more pixels from a VGA monitor (!), though
it would be nice to see crisp ones.  The problem which is attributed to the
"dot clock" may arise from the natural jitter of the video sampler when
sampling a video signal (Apple II) whose dot rate is not rationally related
to the sample rate is present.  Remember that the timing of the Apple II
video signal is not exactly NTSC, and is almost certainly not on the pre-
defined internal "menu" of the XRGB-2plus.

I am interested in whether you would prefer the display on a VGA display
to the display on the native Apple RGB monitor.  In other words, if I don't
care whether I use one display or the other, which looks better, and why?

-michael

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