Bob,

Fast Forward Engineering has a BASIC routine to generate a precise delay
routine. The URL is
http://www.geocities.com/SiliconValley/2499/answers.html#PIC00067.

As for the DTMF code, check out Eric Smith's web page at
http://www.brouhaha.com/~eric/pic/
or
David Thomas' code at http://www.rt66.com/dthomas/pic/dtmf.txt

Hope this helps.

Greg Maki