The two books recommended ("AppleIIe Reference Manual" as well as "Inside the IIe") were very useful. Since they were very old, I was unable to find them anywhere: I had to use pdf and fedex kinko:

http://forum.6502.org/images/migrated/020557-000.jpg

But I now have a much better understanding of ...

The amount of help and good will I am seeing here is beyond my wildest expectations.

@Miles: Thanks for this extensive post, I have a much better understanding of how the soft switches are working (this explains those "HIRESon " MACROs and this is probably the way the disk drive was piloted as well ...

Holy grail !!!

Thanks !

@Miles J:

To reply to your questions: I know next to nothing about Apple II or Apple //e. But:

1. It is a very sad thing to see the source code of a game of this magnitude and nothing done with it. This is the equivalent of Doom Source Code in a lot of regard. I believe that if it was provided ...

For now I am trying to read the source code and understand the overall architecture. Some of the directive/pseudo-code are hard to decipher Especially the way the .S module communicate with each other:

The main loop is in MASTER.S:
https://github.com/jmechner/Prince-of-Persia-Apple-II/blob/master ...

Thanks BigDumbDinosaur.

I just tried Michal Kowalski's program but it seems the Prince of Persia assembly is not supported:

- * comments lines are not recognized.
- org directive is not supported (only .org is).

I started to fix the files manually (removing the comments and changing "org ...

As many here already know: the source code of Prince of Persia for Apple II has been released some time ago:

https://github.com/jmechner/Prince-of-Persia-Apple-II/

Unfortunately so far nothing has been done with it which is a very sad thing for anybody that loves software.

I want to compile it ...