Hi I've used 16 Mhz crystal with both 16C73 and 74's, I used 22 pF capacitors . Perhapse 15pF is to low. Cheers Richard Bond.. VK4XRB richardb@mailbox.uq.edu.au ---------- > From: Automatic digest processor > To: Recipients of PICLIST digests > Subject: PICLIST Digest - 26 Oct 1997 to 27 Oct 1997 > Date: Tuesday, October 28, 1997 4:03 PM >