Chip8 Emu Help

[gergep]

i have been trying to make a chip8 emu but have run into some problems
its been programmed on a mac using objective-c/cocoa with some c

1) i dont know how to do the draw opcode using opengl
2) whenever i run it, the app always freezes (rainbow swirling thing) a few seconds into the emulation

could anybody please help me (source is below)


and since this is my first post, let me say great job on the emu guys and continue the good work

any help would be appreciated

http://www.megaupload.com/?d=WKZ01OU2
( source code is in xcode 3.0 format )
thanks