I was not aware of the situation with the PSX until aguycalleddave from these forums informed me of the similarities and even connection between the PSX and the PSP. The PSX's interface is incredibly similar to to the PSP's... so much that it may seem like...
Maybe the PSX was released in Japan and when the system didnt sell very well, they thought... "Well, hell we got a portable system coming out. Why don't we just give them all the features of the PSX?"
Check this site out if you haven't already. Look at the features the PSX supports and the ones the PSP has already and the ones rumored. The PSX has a TV Tuner, just like the PSP is speculated to have in future updates. The PSX has XMB, also rumored. There are even features the PSP already has like backgrounds.
WHY hasen't anyone acknowledged this yet!? The PSP system itself IS the PSX in America.