Re: Reccomending a monitor?

["Kelli Halliburton" <kelli217@crosswinds.not>]

Michael J. Mahon wrote:
> Kelli Halliburton wrote:
>
>> Michael J. Mahon wrote:
>>>> The other issue is if the 80 columns are interlaced or not.  The
>>>> standard composit output from the Apple is 30 frames (not 60)
>>>> interlaced.
>>>
>>> No, the Apple II video is 60 fps, non-interlaced.
>
> Actually, David Stark wrote the >>> part.  I wrote the >> part.

Yeah, I got that. I was responding to the parrt with ">>", you may have
noticed.

> And 60 fps in the case of non-interlaced video is "frames",
> since for non-interlaced video there are no "fields" (or the
> field is identical to the frame).

Right, but Apple II video is NOT 60 frames per second. And the videdo it
produces IS interlaced.

>> No. NTSC video is 30 frames per second interlaced, which works out
>> to 60 FIELDS per second. The reference to 60 fields per second (an
>> interlaced frame consists of two fields) is probably what inspired
>> the earlier poster's correction.
>>
>> Apple II video is NTSC video, because it can be output to any NTSC
>> composite, or monochrome monitor.
>
> Apple video is _close_ to NTSC, in the sense that it will work with
> an NTSC-compatible monitor, but it is _not_ NTSC, since it is
> non-interlaced.  It also differs from the NTSC standard in its
> blanking and sync pulse timing--it's just "close enough" to
> work on almost anything that NTSC works on.

It IS interlaced. An NTSC monitor will NOT scan at 60 frames per second.

The Apple II simply produces the same image for both fields, which is what
is called a "scan-doubled" image.

>> And I use the term "NTSC monochrome" advisedly, to indicate 525-line,
>> 30-frame-per-second, interlaced monochrome video. I would also use
>> the term "PAL monochrome" in the same context to indicate 625-line,
>> 25-frame-per-second monochrome video. Of course, we could always
>> adopt HD nomenclature, and say 525/60i and 625/50i.
>>
>> HDTV terminology deals with the smallest vertical refresh unit,
>> which is a frame in progressively scanned video, but a field in
>> interlaced video, and indicates the method of scanning used as the
>> last character, so a progressively-scanned image at the same
>> resolution and frame rate would be 625/30p.
>
> I agree that this is the standard terminology.
>
> The OP's major error was in thinking that the Apple II video was
> interlaced, which it is not.

Yes it IS.