Disable break key in basic

I wanted to add some code to a basic program I wrote decades ago and I wanted to use the break key to stop the code while the program was running in the section of code I was interested in, but the break key isn't stopping the program.  I'm thinking I must have done a poke that disabled the break key, but I don't remember it after all these years.  Does someone know an address to poke that would disable the break key.  I do several pokes at the beginning of the program, I just don't know which to remove so I can break into the program again.

Thanks,

Bob