how to use psx joystick

hi all, I wanna play PS1 game on my SuSE 8.1pro. I have downloaded the emulator, it is ePSXev1.5. I also have a ps1 joystick for PC, it can only be attached to paralel port. How to use it,because the joystick doesn't respond when I configure through ePSXe v1.5 ? Please, give me a solution. Thx