printf (...) interpreted as function at a.pl line 13.
processing row/column/bit 5/0/0: ▒
Argument "M-^P" isn't numeric in printf at a.pl line 13.
Argument "M-^P" isn't numeric in printf at a.pl line 13.
Argument "M-^P" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/10010000.  Test bitmask is 128/80/10000000/00110001.
Argument "M-^P" isn't numeric in bitwise and (&) at a.pl line 23.
0
processing row/column/bit 4/0/0:
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/00000000.  Test bitmask is 128/80/10000000/00110001.
Argument "\0" isn't numeric in bitwise and (&) at a.pl line 23.
0
processing row/column/bit 3/0/0:
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/00000000.  Test bitmask is 128/80/10000000/00110001.
Argument "\0" isn't numeric in bitwise and (&) at a.pl line 23.
0
processing row/column/bit 2/0/0:
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/00000000.  Test bitmask is 128/80/10000000/00110001.
Argument "\0" isn't numeric in bitwise and (&) at a.pl line 23.
0
processing row/column/bit 1/0/0:
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/00000000.  Test bitmask is 128/80/10000000/00110001.
Argument "\0" isn't numeric in bitwise and (&) at a.pl line 23.
0
processing row/column/bit 0/0/0:
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Argument "\0" isn't numeric in printf at a.pl line 13.
Incoming byte is 0/0/       0/00000000.  Test bitmask is 128/80/10000000/00110001.
Argument "\0" isn't numeric in bitwise and (&) at a.pl line 23.
0