On its first day in Japanese stores, the PlayStation Portable has almost completely sold out. Sony may have to boost production of the PSP in order to meet demand, but may find this hard because it has already established schedules with components suppliers that can't be easily changed.

The PSP not only plays games but movies as well, and is due to be launched in Europe and North America early next year. Demand for the device has been overwhelming.

"Some game fans stood in line all night to be among the world's first to get their hands on the PSP, which is at the centre of Sony's drive to unseat Nintendo Co. as the king of the market for handheld game machines."