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Re: Vintage Computing Advice
On 2009-04-29 02:40:15 +0700, Steven Hirsch <snhirsch@gmail.com> said:
Jason wrote:
I do not think you'll be very happy with the picture from a
composite-to-VGA converter. This has been discussed to death on
earlier threads.
I did a bit of digging with Google and found a few threads that touched
on it. I couldn't find any reference to something like this:
http://www.ambery.com/vitoxgacoscs.html It seems like the perfect
solution to avoid using an old monitor or waiting around for some FPGA
jockey to come up with a hack to read the display memory directly and
then output a VGA signal. The question is, does it work as well as the
manufacturer claims?
On anything that follows the NTSC standard it probably works well.
Problem being that Apples do not - any of them. Check archives of this
newsgroup for technical explanations from greater minds than I.
The only scan converter that's known to provide reasonable results is
the Highway Model 100 when used with a IIGS.
OK, I dug around a bit more and found some discussions from 2007 on the
subject. To summarize what I read, it appears that apple uses a
non-NTSC-standard dot clock.
However, the converter above claims to support scan conversion
frequencies between 15.75 to 48.63 Khz. Anyone know what frequency the
Apple // series use? The manufacturer guarantees that it will convert
ALL video signals -- that sounds like a pretty bold claim to me, but if
it's true it would be great at a $60 price point. It also claims to
use modern DSP processing techniques (3D Y/C separation comb filter, 3D
motion adaptive YNR/CNR noise reduction, etc.) to improve the quality
of the picture.
If no one else here has tried one of these on an 8-bit //-series, I may
go ahead and pick one up and report back on how it works when I get my
//c. I can always use it for something else if it doesn't work on the
Apple.
--
Jason