The generator matrix

 1  0  1  1  1  6  1  1 12  1  1 10  1  1  8  1  1 14  1  1  4  1  1  2  1  1  0  1  1  6  1  1 12  1  1 10  1  1  8  1  1 14  1  1  1  1  4  2  2  2  0  2  2 12  2  2  8  2  2  4  1  1  0  1  1 12  1  1  1  1  8  4  1  1  1  1  1  1  1  1  1
 0  1  3  6  5  1 12 15  1 10  9  1  8 11  1 14 13  1  4  7  1  2  1  1  0  3  1  6  5  1 12 15  1 10  9  1  8 11  1 14 13  1  4  2  7  1  1  1  0  6  2 12 10  2  8 14  2  4  2  2  0  3  1 12 15  1  8  4 11  7  1  1  6 10 14  2  5  9 13  1  0

generates a code of length 81 over Z16 who´s minimum homogenous weight is 80.

Homogenous weight enumerator: w(x)=1x^0+12x^80+218x^81+12x^82+2x^84+4x^85+2x^86+1x^88+2x^89+1x^90+1x^98

The gray image is a code over GF(2) with n=648, k=8 and d=320.
This code was found by Heurico 1.16 in 0.169 seconds.