I've added the possibility to analyze and view A0 and A1 trinket pins on the screen.

A0 & A1 can be used as inputs, inputs pullups and/or outputs.

IN: input / OU: output / UN: unused

3 modes (A0==UN && A1==UN not a possible case):

1. Input mode : (A0 == IN && A1 == IN) || (A0 == IN && A1 == UN) || (A0 == UN && A1 == IN)
2. Output mode : (A0 == OU && A1==OU) || (A0 == OU && A1 == UN) || (A0 == UN && A1 == OU)
3. Mixed mode : (A0 == OU && A1==IN) || (A0 == IN && A1 == OU)

Oscilloscope screen works :)