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If you updated from v1.10 to 1.13, blackhawk5193, it might be an idea to delete your configuration file (psx.ini) and reconfigure.
If, as I guess from references to a "DOS-ish window," you're using Windows, psx.ini will be in your pSX folder.
Apart from that, how are you playing the game, from a CD or an image? If you're playing from an image, Playstation CDs are often hard to rip properly; try playing from the CD. The 'illegal opcode' errors do suggest that you're playing from an image and there's a problem with it.
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