Chema, Dbug: thanks for your answers !! And sorry Chema I missed your first answer, it was funny afterwards when I discovered you had actually replied before I mentioned your name and that you had considered porting the game !!
Back to the auestion of 'it is doable on the Oric'...Well, you both said it was probably doable, keeping in mind Oric graphics limitations (especially with colour attributes), and I would add, regarding the use of 'big sprites', that games like Stormlord by Twilighte demonstrated if need be that 'big software sprites' (albeit not animated in as detailed a manner as the PoP character) are possible...
Now, I stumbled across a VERY interesting piece of news while wandering the net for Prince of Persia, I'm not sure if any of you is aware that the Prince of persia original Appel II source code was released back in 2012 ???!!!
Here are the links to the announcement and source code on GitHub:
Also, I found a series of article containing a somewhat useful analysis of the original source code:
AMong interesting details, it says a bunch of very advanced techniques at the time where used in the code, from "self-modifying code, in-house bootloader, clever floppy disc format to skewing lookup tables"...
Obviously, not much of this would be of any real use to porting the game to the Oric, given the hardware differences, but to me, it might constitute a proof if need be that it is indeed doable on the Oric. The reason being, as far as I know, the Apple II had NO hardware sprites, (see http://en.wikipedia.org/wiki/Apple_II_graphics
) hence all animation and graphics processing had to be done in software, like on the Oric! So, if it was doable on the Apple, it must be doable on the Oric, albeit with the known color/attribute clash limitations !