Re: [stella] Closed Captions (Again)

Subject: Re: [stella] Closed Captions (Again)
From: Erik Mooney <emooney@xxxxxxxxxxxxxxxx>
Date: Thu, 23 Nov 2000 22:19:21 -0500
> Looks like you guys stopped where I did last time I thought about
> messing with this.  I started reverse-engineering CC for another
> project I was doing, but I'm not sure where my notes are (on my
> Amiga, probably).
> Closed captions are sent two characters to a line as big fat white
> bits on a black background.  I don't recall whether it's sixteen
> bits or not (something itches in my brain and tells me it's not),
> but I can just roll my monitor and look, so I will later on.

There's no need to reverse-engineer it. The book Video Demystified has a
pretty complete explanation of it.  It is sixteen bits on one line,
corresponding to one character, each frame.  The book is at school where
I'm not for the weekend... when I get back I'll look up what it's got.

> Anyone have any great ideas about getting me 16 arbitrary bits or
> so across a scan line?  The decoders are pretty tolerant, so
> switching the playfield might work (even though 8 doesn't go into
> 20 nicely) if it was pretty reliable.  Or a combination of really
> fat players and playfield graphics maybe?  Give it some thought.

It's not 16 bits across the entire scan line.. IIRC, it's somewhere in the
middle.  Again, I'll look it up when I can.

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