21st Anniversary of PSP Release Why Couldn't Win Nintendo DS #エキスパートトピ (Kiyoshi Tane) - Expert - Yahoo! News

21st Anniversary of PSP Release Why Couldn't Win Nintendo DS #エキスパートトピ (Kiyoshi Tane) - Expert - Yahoo! News
On December 12th, Sony's handheld game console "PlayStation Portable (PSP)" celebrated its 21st anniversary. It was Sony's first handheld game console, and although it competed with the Nintendo DS, it was not enough. However, the global sales volume was about 82 million units, which was the highest level of popularization. Graphics that are said to be comparable to the stationary PS2......

The linked article is in Japanese.