hi guys,
im using first 18f8520 and i need to read a encoder.
my encoder have 90 slits on it.
can eneyone help me with the code?
thanks 
Take a look at: http://kevin.org/frc/2005/frc_encoder.zip
Kevin Watson did an example of a quadrature encoder. If you have a single phase wire coming out of your Vex encoder (new ones are quad encoders, old ones are single phase) then you can still use this, but it will only count up.
thanks