Untietld™

-- manual timer start (set to spacebar)
-- stops when mario touches flagpole (but can be manually stopped by pressing \, and reset by pressing R which is forced during a reset assuming you use the reset hotkey)

t = 0; s = 0; m = 0; frames = 0;
t_final = 0; s_final = 0; m_final = 0;
x = 214; y = 220;

fp = 0;
running = 0;

while (true) do

    if input.get().R then
        running = 0 --timer not running and reset
        fp = 0
    end;

    if input.get().space then
        running = 1 --timer running
        fp = 0
    end;

    if input.get().backslash then
        fp = 1 --timer not running but not reset
    end;


    if running == 0 then
        gui.text(x,y,"0:00.000")
        frames = 0
    end;

    if running == 2 then
        gui.text(x,y,string.format(m_final)..":"..string.format(s_final));
    end;

    -- timer script
    if running == 1 then
        frames = frames + 1

        t = (frames)/(39375000 / 655171);
        s = t % 60;
        s = math.floor(s*1000)/1000;
        if s < 10 then
            s = "0"..s;
        end;
        s = string.format(s)
        m = math.floor(t / 60);

        gui.text(x,y,string.format(m)..":"..string.format(s));
    end;

    -- s t o p p
    if memory.readbyte(0x001D) == 3 then
        fp = 1;
        t_final = t;
        s_final = t_final % 60;
        s_final = math.floor(s_final*1000)/1000
        if s_final < 10 then
            s_final = "0"..s_final
        end;
        s_final = string.format(s_final)
        m_final = math.floor(t_final / 60);

        running = 2;
        gui.text(x,y,string.format(m_final)..":"..string.format(s_final));
    end;

    FCEU.frameadvance()
end;