hr@uicsl.UUCP (09/24/85)
<>
I get a strange sense of deja vu...
A friend asked me if I would ask you:
Is there a simple way, say a chip, to convert RGB(I) signals
to composite video?
I doubt the application requires extreme precision. I think it may have
something to do with a Commodore 128.
harold ravlin
{ihnp4,pur-ee}!uiucdcs!uicsl!hrbrad@gcc-bill.ARPA (Brad Parker) (10/01/85)
In article <10500004@uicsl> hr@uicsl.UUCP writes: >A friend asked me if I would ask you: > Is there a simple way, say a chip, to convert RGB(I) signals > to composite video? >I doubt the application requires extreme precision. I think it may have >something to do with a Commodore 128. > harold ravlin > {ihnp4,pur-ee}!uiucdcs!uicsl!hr I think TI makes a chip which supported the 9918 graphics processor (used in Colecovision?) which did this. I think it had a number like 1372? (TMS1372?) I seem to remember that it took RBG in as well as composite and produced modulated RF? (it's been a while and I have a cold) -- J Bradford Parker uucp: seismo!harvard!gcc-bill!brad "She said you know how to spell AUDACIOUSLY? I could tell I was in love... You want to go to heaven? or would you rather not be saved?" - Lloyd Coal
nrh@lzwi.UUCP (N.R.HASLOCK) (10/04/85)
In article <10500004@uicsl> hr@uicsl.UUCP writes: >A friend asked me if I would ask you: > Is there a simple way, say a chip, to convert RGB(I) signals > to composite video? >I doubt the application requires extreme precision. I think it may have >something to do with a Commodore 128. > harold ravlin > {ihnp4,pur-ee}!uiucdcs!uicsl!hr This is taken from my copy of the Atari 800 logic. comp video is sync + chroma + luminance luminance ---> op amp --------+----+-----> comp video --> rf modulator | | sync ---> op amp --> diode -->+ | | color---> op amp --> 100pf -> 1k --+ -- -- {ihnp4|vax135|allegra}!lznv!nrh Nigel The Mad Englishman or The Madly Maundering Mumbler in the Wildernesses Everything you have read here is a figment of your imagination. Noone else in the universe currently subscribes to these opinions. "Its the rope, you know. You can't get it, you know."