Hi All, I mentioned plans to do a 6 pics with one crystal setup. The prototype works fine with one 20 MHz crystal and the rest of the PICs connected in a chain. There was going to be two chains of 6 but now I have 12 PICs running on one crystal and no signs of trouble each one buffers the clock through the HS type schmidtt input occilator inverter for the following PIC. -- Kalle Pihlajasaari kalle@data.co.za Interface Products Box 15775, Doornfontein, 2028, South Africa +27 (11) 402-7750 Fax: +27 (11) 402-7751