GL_POINT_SMOOTH on ATI128

I have some troubles with points. It seems that smoothed points are not available with my card (ATI Rage 128 Pro on iMac/MACOS 9.0). When i use glPointSize ( 5.f ) with GL_POINT_SMOOTH enabled, my points remain big ugly squares . Do i have to enable alpha blending ?

Regards, JC.

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