maxX, maxY = term.getSize() -- Getting the screen size

-- Note: I had some other functions setting the current text and background colour
currentTextColor = colors.white
currentBackgroundColor = colors.black

function myWrite(string)
    tempstring = tostring(string) -- If it's a number it becomes a string here.
    local x, y = term.getCursorPos()
        -- Splitting every single char and save them
    for i=1, #tempstring do
        save(tempstring:sub(i, i), x+i-1, y, currentTextColor, currentBackgroundColor)
    end
        -- Write to the screen
    oldWrite(tempstring)
end

function save(letter, x, y, tColor, bColor)
-- Here I store the textcolour, backgroundcolour and the char into the table.
    screen[y][x]["fg"] = tColor
    screen[y][x]["bg"] = bColor
    screen[y][x]["ch"] = letter
end

-- Before I can put anything into the table, I have to create it.
-- It puts spaces into every block of the screensize.
for y=1, maxY do
    screen[y] = {} -- Telling lua screen[y] is a table.
    for x=1, maxX do
        screen[y][x] = {} -- Telling lua there is a table in the table screen[y]. Tableception!
        screen[y][x]["fg"] = colors.white
        screen[y][x]["bg"] = colors.black
        screen[y][x]["ch"] = " "
    end
end

oldWrite = term.write -- I want to keep the term.write. So If I would do oldWrite("Hello World!") it writes Hello World! to the screen
term.write = myWrite -- Overwriting the function. Now if write() or term.write() is called, my function will be run.