The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  0  2 12  2  8  2  4  1  1  1  1  1  1  1  1  2  2  2  2  2  0  2 12  2  8  2  4  1  1  1  1  1  1  1  1  4  0  2  2  2  2  4  8  2  2  0 12  2  2  8  4  4  4  2  2  1
 0  2 12  6  8 14  4 10  0  6 12 10  8 14  4  2  0  6 12 10  8 14  4  2  6  2 10  2 14  2  2  2  0  6 12 10  8 14  4  2  0 12  8  4  6  2 10  2 14  2  2  2  0 12  8  4  6 10 14  2 12  4  0  8 12  4  4  4  6 10  2  2 14  2  2  2  0  8  6 14  0

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

Homogenous weight enumerator: w(x)=1x^0+4x^80+94x^81+7x^82+12x^83+2x^84+6x^85+1x^92+1x^94

The gray image is a code over GF(2) with n=648, k=7 and d=320.
This code was found by Heurico 1.16 in 0.28 seconds.