On Gamespot.com it says there is a FIFA 99 cheat.
Here:
At the opening screen type "the oldies". Now you can play old matches like the
finals of champions league in 1988.
Is this true?

HEY SMART GUY THERE WAS NO CHAMPIONS LEAUGE IN 1988 IT STARTED AT 1990 OR SOMETHIN

You idiot, Champions' League has been going for decades, it was called European Cup back then but it is still the same thing. Is the cheat real?