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goto80
Registered: Jan 2002
Posts: 138 |
Generate teletext signal with C64?
Would it be possible to generate a teletext signal alongside the audio and video in the RF-output of the C64? |
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Ninja
Registered: Jan 2002
Posts: 411 |
From my research, I think you will need a C128 because you will need hires pixels in full width (sideborder) in the upper border. You might get away with a c64 if the TV recognizes a videotext-line just by its pattern even if outside its expected rasterline. Depends on a lot of other things, too. Lightgrey might not perfectly match the specified intensity and one will need to do some bit-stuffing as the pixel-clocks don't match. So, you might get it to work on some TVs, not necessarily all. |
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Merman
Registered: Dec 2002
Posts: 140 |
There was an add-on that allowed you to decode Teletext signals, and that had an editor to create Teletext-style pages... but not generate the actual signals. |
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goto80
Registered: Jan 2002
Posts: 138 |
@Ninja: Would it be easier with the Amiga? I guess I don't understand how to make graphics 'outside the screen'. :) I'm basically looking for an easy way to mix teletext & video, that doesn't involve a 5000 euro teletext inserter.
(sorry, guess it went OT) |
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Ninja
Registered: Jan 2002
Posts: 411 |
I don't know much about gfx-capabilities of the Amiga. I'd suspect if it could easily do it, it would have been done already. |
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Oswald
Registered: Apr 2002
Posts: 5095 |
well if you think a c128 could do it with open borders then an amiga could do it twice as easily. |
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Ninja
Registered: Jan 2002
Posts: 411 |
Oswald: Hic Rhodos, hic salta! |
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lemming
Registered: Oct 2009
Posts: 44 |
Quoting NinjaI don't know much about gfx-capabilities of the Amiga. I'd suspect if it could easily do it, it would have been done already.
At least Dweezil/Complex did it on Amiga back in 1999 but the production it was supposed to be in was never released.
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linde
Registered: Jul 2006
Posts: 47 |
If the Amiga can do it, then inserting it into another video signal should just be a matter of syncing and switching the amiga video signal in at the right lines. Doable with some genlock hardware? |
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goto80
Registered: Jan 2002
Posts: 138 |
@Lemming: Apparently he never got it to work as well as he wanted to. I asked him. You know of any other teletext-hackers? :) |
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Count Zero
Registered: Jan 2003
Posts: 1940 |
There was a genlock interface for the c64 allowing you to add text (and some effects?) to a video(signal).
The company which created it was Scanntronik from germany I think.
Maybe something alike will work similar for you?
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Ninja
Registered: Jan 2002
Posts: 411 |
Yeah, the genlock could put nice PETSCII on top of the video. I got one but never tried it... |
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Oswald
Registered: Apr 2002
Posts: 5095 |
in the small town I grew up the local town tv used c64's for years for subtitling with a genloc. they were also used to broadcast "no signal" pictures, and display "tv news" texts. |
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Count Zero
Registered: Jan 2003
Posts: 1940 |
Ninja: You could put anything, no? Afair there is a definition or so as for which c64 color needs to be background to be transparent for the video signal. Anything else should get displayed so not just petscii.
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Oswald
Registered: Apr 2002
Posts: 5095 |
on the genloc I saw you could put "anything" :) |
