Note: this tutorial is for Snow Leopard.
YES IT DOES WORK FOR LION
First download the app from pcsx2mac.net:
http://pcsx2mac.net/files/pcsx2SL.pkg
Then download NVidia CG Framework:
http://developer.nvidia.com/object/cg_download.html
You will have to make an account if you don't have one already, it's free regardless.
Install both packages and then start PCSX2
NOTE: You will need to download Bios for the emulator which you find easily with the help of Google.
So first go to Config/Configure this is what it should look like:
To get your bios just press "Select Bios Dir(as in Directory)" and then choose the folder with the bios that you downloaded.
GRAPHICS:
This is what the graphics should look like
For certain games pay attention to the bottom, you can go through a check list that will fix games like Kingdom Hearts and what not so it's not so choppy)
Also the widescreen and choice in Resolution doesn't matter, I just like it that way
SOUND:
FIRST CONTROLLER:
Controller settings are really up to you, if you can get a gamepad that works with your mac then I'd use that. But these are my settings(they're close to Assassins Creed 2 if you've ever played that on the Mac)
EDIT: Notice for "Select" and "Triangle" I have both set to "V", that was a mistake, change Select to something like M(since Start is N).
Leave everything else the same(just don't forget to set your Bios Directory)
After all that you're ready to play a game. Press OK to save your settings.
Click File/Run ISO Image
Then find wherever you downloaded your ISO. For some reason the mac version always starts you out at /Applications/pcsx2.app/Contents/Resources/pcsx2
so you'll have to click that and then "/" to take you back and then choose "Users/" then you're name/ and from there it's wherever you put it for me I made a folder named "PS2 Isos"
From there select your game and press OK, enjoy playing
For games that are different language like Kingdom Hearts 2 Final Mix+ which is Japanese, you'll have to set your Bios to Japanese.
FOR BIOS AND GAMES USE GOOGLE, DUH GUYS.
Hope I helped at all.
YES IT DOES WORK FOR LION
First download the app from pcsx2mac.net:
http://pcsx2mac.net/files/pcsx2SL.pkg
Then download NVidia CG Framework:
http://developer.nvidia.com/object/cg_download.html
You will have to make an account if you don't have one already, it's free regardless.
Install both packages and then start PCSX2
NOTE: You will need to download Bios for the emulator which you find easily with the help of Google.
So first go to Config/Configure this is what it should look like:

To get your bios just press "Select Bios Dir(as in Directory)" and then choose the folder with the bios that you downloaded.
GRAPHICS:
This is what the graphics should look like

Also the widescreen and choice in Resolution doesn't matter, I just like it that way
SOUND:

FIRST CONTROLLER:
Controller settings are really up to you, if you can get a gamepad that works with your mac then I'd use that. But these are my settings(they're close to Assassins Creed 2 if you've ever played that on the Mac)

EDIT: Notice for "Select" and "Triangle" I have both set to "V", that was a mistake, change Select to something like M(since Start is N).
Leave everything else the same(just don't forget to set your Bios Directory)
After all that you're ready to play a game. Press OK to save your settings.
Click File/Run ISO Image
Then find wherever you downloaded your ISO. For some reason the mac version always starts you out at /Applications/pcsx2.app/Contents/Resources/pcsx2
so you'll have to click that and then "/" to take you back and then choose "Users/" then you're name/ and from there it's wherever you put it for me I made a folder named "PS2 Isos"
From there select your game and press OK, enjoy playing

For games that are different language like Kingdom Hearts 2 Final Mix+ which is Japanese, you'll have to set your Bios to Japanese.
FOR BIOS AND GAMES USE GOOGLE, DUH GUYS.
Hope I helped at all.
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