Re: [stella] Closed Captions (Again)

Subject: Re: [stella] Closed Captions (Again)
From: Robert Blazewicz <blaze@xxxxxxx>
Date: Fri, 24 Nov 2000 14:47:25 -0500
At 06:25 PM 11/22/2000, A Braunsdorf wrote:

I thought I was clever coming up with the idea of using closed
captioning on the 2600, but figured I'd search the archives first
to see if I was being stupid. :-)

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.

The waveform and the caption specification is part of the EIA608 specification. The waveform has a few static 'bits' that compose a clock run-in, a sync pulse, and then 16 bits of data. The primary closed caption usage is on field 1 of line 21. I have the spec on my desk at work and can provide more details next week if needed.

Most people use the CC1 stream of data and consider that Closed Caption. There are other optional interleaved streams of data that might be used. For text adventure game usage I might also suggest using the T1 stream. This text stream allows text sent to the decoder to appear as scrolling pages of text rather than just 1 to 3 lines.


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