The generator matrix

 1  0  1  1  1  6  1  1  4  1  2  1  1  1  0  1  2  1  2  1  1  1  0  1  1  4  1  0  1  1  1  6  6  1  1  1  2  0  1  1  1  1  2  1  1  1  1  6  2  1  1  6  2  1  2  2  6  0  1  4  0  4  2  1
 0  1  1  6  3  1  0  3  1  2  1  5  7  6  1  0  1  5  1  4  3  5  1  6  0  1  7  1  4  5  4  1  1  6  2  4  1  1  2  6  7  4  1  7  3  0  0  1  1  3  7  1  1  7  1  4  1  1  5  1  1  1  2  0
 0  0  2  0  6  0  6  4  6  2  6  4  2  4  4  6  6  0  0  0  4  2  2  6  4  2  6  4  2  4  2  0  0  0  2  2  2  6  0  2  2  2  2  2  0  0  0  6  0  4  0  4  0  0  4  6  6  2  4  2  0  4  0  0
 0  0  0  4  0  0  0  4  4  0  0  0  0  4  4  0  4  0  4  0  4  0  0  0  0  4  0  4  0  0  4  4  4  0  0  4  4  4  4  4  0  0  0  4  4  0  4  0  0  4  0  0  4  0  4  4  0  4  0  4  0  4  0  0
 0  0  0  0  4  0  0  0  0  0  4  4  0  4  0  4  4  0  0  4  4  4  0  4  4  0  0  0  4  0  0  4  4  4  4  0  4  4  0  4  4  0  0  4  4  0  0  0  4  4  0  0  4  0  0  4  0  0  4  4  4  4  4  0
 0  0  0  0  0  4  0  0  0  4  0  4  0  0  4  0  4  4  0  0  0  0  4  4  4  4  4  4  4  0  4  0  4  0  0  0  0  4  0  0  4  4  4  0  4  0  4  4  0  0  4  4  0  0  4  0  0  4  0  0  4  4  4  0
 0  0  0  0  0  0  4  0  4  0  0  0  4  0  0  4  0  4  0  0  4  4  4  0  4  4  0  4  4  4  4  0  0  4  0  4  4  4  4  4  0  4  0  0  0  4  0  4  4  0  4  4  4  4  0  0  0  0  0  0  0  0  0  0

generates a code of length 64 over Z8 who´s minimum homogenous weight is 56.

Homogenous weight enumerator: w(x)=1x^0+30x^56+90x^57+215x^58+236x^59+263x^60+332x^61+314x^62+402x^63+424x^64+378x^65+359x^66+302x^67+235x^68+202x^69+120x^70+66x^71+54x^72+16x^73+6x^74+14x^75+11x^76+2x^77+6x^78+4x^79+3x^80+4x^81+3x^82+3x^84+1x^90

The gray image is a code over GF(2) with n=256, k=12 and d=112.
This code was found by Heurico 1.16 in 0.785 seconds.