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  1  1  1  1  1  1  2  2  2  2  4  1  0  0  1  0  2  1  2  0  2  1  2  2  1  4  1  2  1  2  1  2  1  2  1  0  1  1  1  2  0  2  1  1  2  1  2  1  1  1  0  1  4  2  2  1
 0  2  0  2  0  0  2  6  0  0  2  6  4  6  4  6  4  0  2  6  2  0  4  6  2  4  6  0  6  6  6  4  6  2  2  6  0  2  0  4  4  6  2  4  0  4  0  2  0  2  6  0  2  2  4  6  4  6  4  2  0  0  6  0  4  2  2  2  2  0  4  2  2  0  2  0  4  0  0  0
 0  0  2  2  0  6  2  0  0  6  2  0  4  2  2  0  6  0  6  4  4  0  2  6  6  2  0  4  2  6  0  2  4  6  6  4  2  4  0  2  2  4  2  2  6  6  6  2  0  6  6  6  0  0  0  0  2  2  6  4  0  2  2  6  2  2  2  4  6  4  2  6  0  4  2  4  0  4  4  0
 0  0  0  4  0  0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  0  0  4  4  4  4  0  4  0  4  0  0  0  4  0  4  4  4  4  0  4  0  0  4  0  4  4  4  4  0  4  0  4  4  0  0  4  4  0  0  0  4  0  0  0  0  4  0
 0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  0  0  4  4  4  0  4  0  4  0  0  0  4  0  4  4  0  4  0  4  0  4  4  0  0  0  4  4  0  4  4  0  4  4  4  4  4  0  0  0  0  0  0  0  0  0  0  4  0  4  0  4  4  4  0  0
 0  0  0  0  0  4  0  0  0  0  0  0  0  0  4  0  4  4  0  0  0  4  0  0  4  4  4  0  4  0  0  4  4  0  4  4  0  0  4  4  4  0  0  4  0  4  4  0  4  0  4  4  4  4  0  4  0  0  0  0  4  4  4  4  4  4  4  4  4  4  4  4  0  0  4  0  0  0  4  0
 0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  0  0  0  0  4  4  0  0  0  4  4  0  0  0  4  4  4  4  0  4  4  4  4  4  4  0  0  0  4  0  0  0  4  0  4  0  4  0  4  0  4  4  4  0  0  4  4  0  4  4  0  4  4  0  4  0  4  0  0  0  0
 0  0  0  0  0  0  0  4  0  0  0  4  0  0  4  0  0  4  0  0  4  0  4  4  0  0  4  4  4  4  0  4  0  4  0  4  4  0  4  0  4  0  0  0  4  0  4  4  0  4  4  4  0  0  0  0  4  0  0  4  4  0  4  0  4  4  4  0  0  0  0  0  0  0  0  4  0  4  4  0
 0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  4  4  4  4  0  4  4  4  4  0  0  4  0  0  0  4  0  0  0  0  4  4  4  4  0  4  0  4  0  4  4  4  0  0  0  0  0  0  0  0  0  0  4  4  4  0  4  0  4  4  0  0  0  4  4  4  4  4  0  0  4  0  0  0  0
 0  0  0  0  0  0  0  0  0  4  0  4  4  4  0  4  0  4  4  0  4  4  0  0  4  0  4  4  4  0  4  4  4  0  4  4  0  4  4  4  4  4  0  0  4  4  4  0  0  4  4  4  0  0  0  0  0  4  0  4  4  4  0  0  4  0  0  4  0  4  0  0  0  0  4  0  4  0  0  0
 0  0  0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  0  4  4  4  4  0  4  0  4  4  4  0  4  4  0  4  4  0  4  4  0  4  4  4  4  4  0

generates a code of length 80 over Z8 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+69x^64+32x^65+183x^66+112x^67+231x^68+212x^69+410x^70+538x^71+752x^72+966x^73+1088x^74+1480x^75+1696x^76+2138x^77+2415x^78+2586x^79+2716x^80+2758x^81+2424x^82+2296x^83+1757x^84+1522x^85+1129x^86+942x^87+623x^88+450x^89+360x^90+200x^91+235x^92+94x^93+137x^94+30x^95+89x^96+18x^97+37x^98+8x^99+16x^100+2x^101+5x^102+5x^104+4x^106+1x^108+1x^112

The gray image is a code over GF(2) with n=320, k=15 and d=128.
This code was found by Heurico 1.16 in 82.7 seconds.