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static MACHINE_CONFIG_START( mc1000, mc1000_state )
[...]
    MDRV_TIMER_ADD_PERIODIC("ne555", ne555_tick, HZ(60*10))

static TIMER_DEVICE_CALLBACK( ne555_tick )
{
    mc1000_state *state = timer.machine->driver_data<mc1000_state>();

    if (++counter == 10)
    {
        counter = 0;
        state->ne555_int = CLEAR_LINE;
    }
    else
    {
        state->ne555_int = ASSERT_LINE;
    }

    cputag_set_input_line(timer.machine, Z80_TAG, INPUT_LINE_IRQ0, state->ne555_int);
}