Zx-81 is a crazy programming machine. He's also a really nice guy and should be a serious asset to GP2X dev. This will take away yet more things PSP has over GP2X though ^_^
Back before I first released gpSP he ported VBA to PSP and kept doing all these weird hacks to it to try to make it faster. I had an intense secret rivalry with him because of it (that he never knew about). Actually, he was the biggest driving factor for me to work as hard and as fast as I could on gpSP. Really stressful times, but the results were good. After I finally released it he contacted me and helped me tweak it for PSP more. Afterwards he went back to focusing on the 9 million other emulator ports he maintains ;D