The largest display multiplexer I've ever done that actually looked good 
(i.e. it was nice and bright and had no observable flicker) had 16 
stages (i.e. 16 individual LED's).

Have you any idea what the "maximum" amount of stages is? Would it be 
possible to make a multiplexer that has 42 stages? I'm using the 
PIC16F887 to orchestrate the display multiplexer. If I want to pull this 
off, should I definitely run the PIC at 20 MHz?

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