Library for creating a BAS signal for b/w tv set

Maybe that the time for tv sets are over, I have something to display on a installed old-time tv set via BAS signal. To create this I use two resistors for the 2 voltage levels resulting in black and white. Exists there a library for timings? Has somebody created something in this direction in former times? Didn’t found anything after intense searching the net. Goal is to create a picture with ca. max. 320 x 240 pix or eventually lower resolution via use of gpio pins. I did it similar on Arduino, it works fine.

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