User File #638273123105612652

memory.usememorydomain("68K RAM");

local function Cond1()
    -- wait until intro has passed
    return emu.framecount() >= 4800;
end

local function Cond2()
    -- wait until the "target distance" is reached
    return memory.read_u32_be(0x6FDC) == 0x9E340;
end

local function Cond3()
    -- wait until input is accepted at the score tally screen
    return memory.readbyte(0x7139) == 1;
end

local function Cond4()
    -- wait until the black screen after the score tally screen
    return emu.islagged();
end

local step_conds = { Cond1, Cond2, Cond3, Cond4 }

local step

local function set_step(new_step)
    step = new_step;
    userdata.set("step", step);
end

set_step(1);

event.onloadstate(function(state_name)
    step = userdata.get("step");
    if (math.type(step) ~= "integer") then
        set_step(1);
    elseif (step < 1 or step > 4) then
        set_step(1);
    end
end, "loadstate_hook");

event.onexit(function()
    event.unregisterbyname("loadstate_hook");
    event.unregisterbyname("exit_hook");
end, "exit_hook");

while true do
    while true do
        if (step_conds[step]()) then
            if (step == 4) then
                set_step(2);
                break
            else
                set_step(step + 1);
            end
        end

        emu.frameadvance();
    end

    savestate.save(string.format("Desert_Bus_%d.state", memory.readbyte(0x7137)));
end