How do I make this fill the screen?

This program displays your terminal to a monitor and allows you to still use the terminal. The problem is that it does not fill the monitor completely, it fills about a 3*5 screen, when I would like it to fill a 6*8 screen.
I'm new to this, please help.

--[[
  demo
  by BigSHinyToys
]]--
local sides = {
  [1] = "left",
  [2] = "top",
  [3] = "bottom",
  [4] = "right",
  [5] = "back",
  [6] = "front",
  }
local tArgs = {...}
local monSide
local monBig = false
local termX,termY = term.getSize()
local customTerm = {}
local moniter
local oldMon = {}
local attached = false
for i=1,6 do
if peripheral.getType(sides[i]) == "monitor" then
  monSide = string.lower(sides[i])
  if peripheral.isPresent(monSide) and peripheral.getType(monSide) == "monitor" then
   attached = true
   local monX,monY = peripheral.call(monSide,"getSize")
   if monX >= termX and monY >= termY then
	monBig = true
   else
	peripheral.call(monSide,"setTextScale",0.5)
	monX,monY = peripheral.call(monSide,"getSize")
	if monX >= termX and monY >= termY then
		 monBig = true
	else
		 print("Monitor to small")
	end
   end
  end
elseif #tArgs == 1 then
  if string.lower(tArgs[1]) == "restore" then
   term.restore()
  end
end
end
if not attached then
  print("No screen attatched")
end
local function wrap( _sFunction )
return function( ... )
  if peripheral.isPresent(monSide) then
   peripheral.call(monSide,_sFunction,...)
   return oldMon[_sFunction](...)
  else
   term.restore()
   print("Screen restored")
  end
end
end
if monBig then
moniter = peripheral.wrap(monSide)
for k,v in pairs(term.native) do
  oldMon[k] = v
end
for k,v in pairs( term.native ) do
  if type( k ) == "string" and type( v ) == "function" then
   customTerm[k] = wrap(k)
  end
end
term.redirect(customTerm)
term.clear()
term.setCursorPos(1,1)
print("Running on monitor")
end

Split to new topic.

What is it that you need help with?

This program will only split my terminal display to my monitor filling half the screen. I would like to modify it to fit the screen its projected to.