christophe said:thanks for all you're help nigel but it still aint got it to work!!I've used ur tutorial 2.1 and changed the things u said. the chips burnt fine but again nothin happens in the circuit. I've checked with a multimeter ive got voltages at the Vdd and that my switches produce a signal, but i aint gettin ne output. I also checked the voltage between the positive rail and the CLK0 which was 3.98V then between positive and CLK1 whcih gave me 4.20V i also checked across the 2 crystal terminals and the V was 0 is this correct or is there something wrong???
I'm a little baffled why you are measuring voltages from the positive rail?, it doesn't actually really make any difference - but it's common practice to measure from the 0V rail (the negative on a single rail supply).
Probably the first thing to do is check it's oscillating, you need access to a scope to do that - you must also use a x10 probe, a x1 probe will stop the oscillator.
