Jim,

My Parallax programmer has 4.00 MHz resonator.

The long and short of it is:

For non-production or non-critical applications up to about 4MHz (5MHz
works) you can get away with using an RC in place of an XT.

Andy

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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
              Electronics for Industry & R/C Hobbyists
         "Go fast, turn right, and keep the wet side down!"
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