The generator matrix

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

generates a code of length 80 over Z16 who´s minimum homogenous weight is 73.

Homogenous weight enumerator: w(x)=1x^0+74x^73+764x^74+1494x^75+2255x^76+2776x^77+3836x^78+3712x^79+4028x^80+3616x^81+3239x^82+2352x^83+2037x^84+1100x^85+708x^86+330x^87+209x^88+126x^89+56x^90+30x^91+12x^92+4x^93+4x^94+2x^95+2x^96+1x^98

The gray image is a code over GF(2) with n=640, k=15 and d=292.
This code was found by Heurico 1.16 in 15.4 seconds.