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Re: Reccomending a monitor?
- Subject: Re: Reccomending a monitor?
- From: pausch@saaf.se (Paul Schlyter)
- Date: Wed, 02 Jun 2004 19:15:24 GMT
- Newsgroups: comp.sys.apple2
- Organization: Svensk Amat|rAstronomisk F|rening
- References: <nzkvc.3871$G25.3712@newssvr27.news.prodigy.com> <20040602122025.12107.00000251@mb-m19.aol.com> <c9l6lq$l19@dispatch.concentric.net>
- Xref: controlnews3.google.com comp.sys.apple2:888
In article <c9l6lq$l19@dispatch.concentric.net>,
Kelli Halliburton <kelli217@crosswinds.not> 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.
>
>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.
Some versions of the Apple II could be hardware strapped on the
motherboard though, to produce 625-line 50 fields/sec video, which
was monochrome unless a PAL card was inserted in Slot 7.
>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.
The latter is definitely preferable, since the term "PAL monochrome",
(besides being an oxymoron) would be confusing to someone from e.g.
Brazil, a country which uses 525-line 60 frames/s PAL for its national
TV transmissions.
>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.
>
>
--
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