Pressing the power button on the computer does not turn it off, but puts the machine into "suspend" mode, which will hold the machine's state as long as battery power lasts, to save on boot time. The CMOS 80C88 CPU has a static core, which holds its state indefinitely by stopping the system clock oscillator, and can resume processing when the clock signal is restarted as long as it is kept powered. The system RAM in the Convertible is SRAM rather than DRAM, both for lower power consumption and less circuitry to fit into the cramped laptop case.