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  1  1  X  X  0  X X^2  0  X  X  0  X  X  X  X  X X^2  0 X^2  X  X  0 X^2  0  0  0 X^2  X  X X^2 X^2 X^2 X^2  X  X  1  1  1  1  1  1  1  1  X  0  1  0  X  0  1
 0  X  0  X  0  0 X^2+X X^2+X  0  0  X  X  0  0 X^2+X X^2+X X^2 X^2  X X^2+X X^2 X^2 X^2+X  X X^2 X^2  X X^2+X X^2 X^2 X^2+X  X X^2  X  X X^2+X  X  0  0  X  X  X X^2+X X^2  0  X  X  X X^2  X  X  0 X^2  X  X  X  0 X^2+X X^2+X  X  X  X  X X^2+X X^2+X  0  0 X^2 X^2 X^2 X^2  0  0 X^2 X^2  0 X^2  0  0 X^2
 0  0  X  X  0 X^2+X X^2+X  0 X^2 X^2+X X^2+X X^2 X^2  X  X X^2 X^2  X  X  0 X^2  X X^2+X X^2  0 X^2+X X^2+X X^2  0 X^2+X  X  0  X  X X^2  0  X  X X^2+X X^2 X^2+X X^2+X  0  X X^2+X X^2  X X^2+X  X  X X^2+X  X  X  0  0 X^2  0 X^2 X^2 X^2  0 X^2  0  0  0  0 X^2 X^2  0  X X^2+X X^2+X  X X^2+X  X X^2  0 X^2+X  X  0
 0  0  0 X^2 X^2 X^2  0 X^2 X^2  0 X^2  0  0 X^2  0 X^2  0  0  0  0 X^2 X^2 X^2 X^2 X^2 X^2  0  0  0  0 X^2 X^2  0  0  0 X^2 X^2 X^2  0 X^2 X^2  0  0 X^2 X^2  0  0  0 X^2 X^2 X^2  0  0  0 X^2 X^2 X^2 X^2  0  0 X^2 X^2  0  0 X^2  0 X^2  0  0  0 X^2  0  0 X^2 X^2  0 X^2 X^2 X^2 X^2

generates a code of length 80 over Z2[X]/(X^3) who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+132x^78+38x^80+66x^82+6x^84+2x^90+8x^94+1x^96+2x^100

The gray image is a linear code over GF(2) with n=320, k=8 and d=156.
This code was found by Heurico 1.16 in 0.483 seconds.