The analog portions of the circuit will be affected more noticably
     than the digital portions.  The digital circuitry is typically driven
     to saturation, masking the problem so that the slight increase in
     conductivity doesn't cause mis-operation of the digital portions of
     the circuit.

     The analog portion, however, will be affected much more by changes in
     conductivity.

     Metal tape, or labels specifically designed for EPROM window covers,
     will do a better job.




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Subject: PIC light sensitivity
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