Nice, here my version using (emulated) hardware from 1982 so no AI.
The 15x15 grid would require 255 numbers to represent each square. I have used a manual compression algorithm to squeeze it down to 99 numbers. Starting at the top left hand corner each horizontal line of colour is represented by 2 numbers - length and colour. Top line is 4,w,8,b,3,w and 254 denotes the end of the line and 255 is end of picture.
This not textart as such but pokes the colours directly to screen