[BC] Secondary & Tertiary Tone

[Fred Morton]

Mark Gierhart wrote:
> Can't remember the audio frequencies used back then? Wasn't one real high and one real low?
>
> Thanks
>
> Mark
>
> Mark D. Gierhart (KE8MB)
> 'The Gierhart Family Inn'
> http://www.watchtv.net/~markg/
>
>
>   
If you're referring to carts, I believe it was 150 hz and 8 Khz. The low 
tone was used primairly for switching the next event, and the high tone 
was used as a warning ("it's about to end, get ready to start something 
else").

Boy, it's been a long time!

Fred Morton
Houston

-- 
Fred R. Morton, CSRE