To fix my problem I've added:
class String
def to_2d_array(value)
unpack("a#{value}"*((size/value)+((size%value>0)?1:0)))
end
end
class << $stdout
alias old_write write
def write(a)
a.to_s.to_2d_array(1024).each{|little| old_write little}
end
end
To my irb.rb file after the last end.