echo "obase=16;$((num=2#01111111))" | bc

0-3 F
0-6 7F
4-6 70
4-7 F0
0-7 FF
7 80
6-7 C0
6 40
3-5 38
2-4 1C
4-5 30
0,4-5 49
5 20
0-5 3F
0-4 1F