The generator matrix

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

generates a code of length 80 over Z16 who´s minimum homogenous weight is 76.

Homogenous weight enumerator: w(x)=1x^0+82x^76+256x^77+459x^78+178x^79+282x^80+196x^81+225x^82+144x^83+101x^84+44x^85+54x^86+14x^87+4x^88+4x^90+1x^92+1x^94+1x^104+1x^106

The gray image is a code over GF(2) with n=640, k=11 and d=304.
This code was found by Heurico 1.16 in 0.421 seconds.