Methods copying data from one location to another in a main memory of a cell processor are disclosed. Use of the gp120 polypeptides from one or more of the isolates in a subunit vaccine, usually together with MN-rgp120, can provide protection against HIV strains that are sufficiently different from the vaccine strain that the vaccine does not confer protection against those strains. The input terminal of differential amplifier is connected to the anode terminal of photodiode PD. The active region has a high impedance in the off state and a low impedance in the on state. Consequently, recording efficiency can be upgraded and program maintenance time can be reduced. The performance of the automotive vehicle equipped with the transmission mechanism of the invention can be improved.