Thank you for the answer. About the hardware issue - I'm quite optimist because these systems shared lots (both have MIPS processor, if I'm not saying wrong, so that might shared the same instructions set) - despite as I read here, PS2 appear to be on the whole more powerful than PSP.
My best wishes and in any way congratulations for what you have actually done!
Well, they both have their pros and cons. For CPUs, the PS2 has a great 64 bit main CPU, and a 36MHz (slow) 32 bit sub CPU; the PSP has two mostly identical 32 bit CPUs that run slightly faster than the PS2's main CPU. I give the edge to the PSP there. The memory is much faster on the PS2, giving it the edge when transferring data around. The video on the PSP is more advanced than the PS2, but maybe just a touch slower. So if you need speed with your video, the PS2 is better, but if you need features, the PSP is better. The PS2 has a wider range of available input devices, can have USB memsticks, and might have a full harddrive; The PSP has guaranteed input available always (it's built into the system for heaven's sake! ), has wifi, Pro Duo memsticks, and might have PC access via USB. Maybe a slight edge to the PS2 there for the range of possible input devices.
Anyway, maybe after we get the new version going on the PSP, I might look into adding PS2 to it as well. My system is set up for doing apps for both, and my PS2 is right here next to the computer. I just won't bother until the PSP version is doing well. No reason to consider it before then. And yes, I do have a harddrive in my PS2. It's also hooked to my local network via ethernet.