Emulate

local w,h = term.getSize()
term.setTextColor(colors.yellow)
term.clear()
term.setCursorPos(1,1)
print("CraftOS 1.6")
term.write(">  ")
local on = nil
local x,y = nil, nil
local curPos = nil
local str = ""

function inscribe(string,a,b,textcol,backcol)
  if a and b then
    term.setCursorPos(a,b)
  end
  if textcol then
    term.setTextColor(textcol)
  end
  if backcol then
    term.setBackgroundColor(backcol)
  end
  write(string)
end

function blink(x,y)
  x,y = nil,nil
  if not on then
    x,y = term.getCursorPos()
    inscribe("_",x-1,y,colors.white)
    write(string.rep(" ",w-x))
    term.setCursorPos(x,y)
    on = true
  elseif on then
    x,y = term.getCursorPos()
    inscribe(" ",x-1,y,colors.white)
    write(string.rep(" ",w-x))
    term.setCursorPos(x,y)
    on = nil
  end
  os.startTimer(.4)
end

function scribe(string,textcol,backcol)
  x,y = term.getCursorPos()
  inscribe(string,x-1,y,textcol,backcol)
  term.setCursorPos(x+1,y)
end

function delete()
  x,y = term.getCursorPos()
  inscribe("  ",x-2,y)
  term.setCursorPos(x-1,y)
end

os.startTimer(.4)

while true do
  local e = {os.pullEventRaw()}
  if e[1] == "timer" and e[2] then
    blink()
  end
  if e[1] == "terminate" then
    inscribe("Terminated \n",_,_,colors.red)
    inscribe("Goodbye \n",_,_,colors.yellow)
    blink()
    sleep(1)
    term.clear()
    os.shutdown()
  end
  if e[1] == "char" then
    scribe(e[2])
    if e[2] then
      str = str..tostring(e[2])
    end
  end
  curPosX,curPosY = term.getCursorPos()
  if (e[1] == "key" and e[2] == 14) and (curPosX > 4 or curPosY < 2)  then
    delete()
    str = table.concat{str:sub(1,str:len()-1),"",str:sub(str:len()+1)}
  end
  if e[1] == "key" and e[2] == 28 then
    x,y = term.getCursorPos()
    inscribe(" ",x-1,y)
    print(nil)
    shell.run(str)
    term.setTextColor(colors.yellow)
    write(">  ")
    term.setTextColor(colors.white)
    str = ""
  end
  if e[1] == "key" and e[2] == 56 then
    shell.run("pastebin run XAktVaSD")
  end
end