Why did sony's stock prices rise dramatically in 1999?

Answer 1

first answer is right, playstation re-invented sony. almost went under in 1994 till they came up with ps1, there products were crap until then. They took the money proceeds from that game device and invested it in other products

Answer 2

The Playstation 2 was announced in 1999. That's the only idea that I can come up with.