Subject: [stella] Closed Captions (Again) From: A Braunsdorf <ab@xxxxxxxxxxxxxx> Date: Wed, 22 Nov 2000 18:25:42 -0500 |
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. Glenn posted the character table from the FAQ. The lower number characters are used to position the cursor, flip the pages, scroll regions, and switch attributes and stuff. It's not so bad figuring this stuff out if you have a monitor that lets you see the signal and a LD player to generate a good clean, repeatable signal you can vary the speed and direction on. If we can change the playfield halfway across the screen (or close enough we can use a player to cover the overlap), I think it'll work. You'd just have to spit the two characters out on line 21 and maintain the pace. If you don't keep changing the line, the captions go away (which makes it harder to figure out). I don't have my 2600 development environment set up here yet, but I'm about a trip to Radio Shack away from it, so maybe I'll try this later in the week. I'm trying hard to not do any real work on my vacation, so this'd be a good project. :-) 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. Looks like I ought to at least finish off reverse engineering CC. No sense in giving those pricks their ransom money. It'll be easier if I have a machine that I can use to try generating some. The 2600 is actually a pretty good choice since most machines won't let you play up there these days. ab -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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