Path: utzoo!dciem!dretor!client2!king
From: king@client2.DRETOR.UUCP (Stephen King)
Newsgroups: comp.sys.amiga
Subject: Re: new chips questions
Message-ID: <988@client2.DRETOR.UUCP>
Date: 1 Sep 88 12:41:26 GMT
Article-I.D.: client2.988
References: <8X635hd38k-041lzFc@andrew.cmu.edu> <4601@cbmvax.UUCP> <2838@pt.cs.cmu.edu>
Reply-To: king@client2.UUCP (Stephen King)
Organization: D.C.I.E.M., Toronto, Canada
Lines: 27

In article <2838@pt.cs.cmu.edu> bader@spice.cs.cmu.edu (Miles Bader) writes:
>My understanding of how interlaced output works must be wrong.
  Must be. :-)
>I would have thought that the horizontal rates would be the same, 
  To de-interlace normal Amiga video, the horizontal scan rate must double.
>and it would just stall every other scan line 
  ?
>(so other people could use the bus).  From what
>you said, I gather that both modes output continuously, 
 True.
>the slower rate of the interlaced mode letting the beam drift farther 
>vertically (and so leaving the gap between lines).
 The beam should never drift - it is always driven. The vertical gap
between scan lines is a product of the vertical integrater within the
monitor. The width of the gap is a function of both horizontal and vertical
scan frequencies. Remember, each field is 262.5 lines. It is the half-line
that is responsible for the interlace.
>
>Is this right?
>
 Sort of. TV signals are notoriously difficult to understand. In fact,
until the building of the space shuttle, colour TV was considered the most
technologically advanced equipment in existance. TV signal processing is
going to get even more sophisticated with HDTV. (high definition TV) I
won't be buying another Amiga until it supports HDTV :-)
-- 
      Stephen J King                ...{utzoo|mnetor}!dciem!dretor!king