bbsterm.rb

require 'eventmachine'
require 'kconv'

class BBSTerm < EM::Connection
  def post_init
    @read_buffer = ""
    @initialization = true
  end

  def receive_data(data)
    @read_buffer << data.force_encoding("IBM437").toutf8

    if @initialization and @read_buffer =~ /\e\[6n/
      @initialization = false
      send_data "\e[1A\r\n"
    end

    @read_buffer.gsub!(/\r\n/, "\n")

    print @read_buffer
    @read_buffer = ""
  end
end

class STDINReader < EM::Connection
  def initialize(term)
    @term = term
  end

  def receive_data(data)
    my_data = data.encode("IBM437", "UTF-8")
    my_data.gsub!(/\n/, "\r\n")
    EM.next_tick { @term.send_data(my_data) }
  end
end

EM.run do 
  term = EM.connect("bbs.hollensbe.org", 3000, BBSTerm)
  EM.attach($stdin, STDINReader, term)
end