Scrolling wrappable text in a limited frame

I'm making an IRC chat program, but I have no clue how to make a frame scroll by itself when it has reached the ending line of the frame. The default scrolling for print() won't work because that works for full screen only. Any ideas?

You may want to put each message into its own section in a table. Example:
Put this on the top:

local messages = { }
local num = 0
shownMessages = 0
maxMessagesOnScreen = 10 --This can be changed to however many you want

And then this in where you get the messages

messages[num] = receivedMessage
num = num+1

Then when you go to display it, check how many lines it can show on the screen and then write that many lines from the ending (#messages will return a number, how many messages are in the table). Example:

if #messages > maxMessagesOnScreen then
  shownMessages = (#messages - maxMessagesOnScreen)
elseif #messages < maxMessagesOnScreen then
  shownMessages = #message
end
for b = 2, shownMessages do
  print(messages[b])
end

Hope this helps you!