A computer system includes one or more devices that are capable of multitasking. A liquid ejection head control method involves simultaneously generating a first drive signal and a second drive signal in a particular period, generating a plurality of first timing pulses and a plurality of second timing pulses, and causing an operation of an element in the liquid ejection head and that performs at least an operation for causing liquid to be ejected. Also, the present subject matter includes a lid conforming sealingly connected to the material defining the first aperture. One or more of the uprights is a specially designed compartment having a plurality of opposing sides which define an initially open interior space, the interior space comprising an integral oil reservoir for storing and supplying oil to the engine during normal engine operation. The first address pre-decode circuitry decodes the address signal and the address holding signals during the setup period to generate a first pre-decode address signal at an output of the first address pre-decode circuitry. The CPU 15 also re-arrays the picture data stored in the memory card 13 in the sequence of the decreasing magnitude of the feeling model output.