There are two versions of Prince of Persia 1 for Commodore 64; the first one was never finished, started in the early 90's, and the second one has been released recently (2011). Below you will find information about both versions.
Prince of Persia 1 for Commodore 64
2011 Mr. SID
Prince of Persia [EasyFlash, PAL/NTSC] 
Released by: Mr. SID
Release Date: 16 October 2011 (v 1.0), 5 November 2011 (v 1.1)
Code - Conrad, Mr. SID
Music - Mr. SID
Graphics - Mr. SID, STE'86, Twoflower
Help - Conrad
V 1.1 Updates:
- Fixed saving on C128
- Fixed mask glitch in level 7
- Fixed flickering column in level 13
- Some small optimizations
- Fixed and added some cheats
- Fixed odd pixels in text screens
Official Blog: http://popc64.blogspot.com/
Prince of Persia +9 (easyflash)
Prince of Persia +9 (easyflash) [pal/ntsc]
Released by: Nostalgia
Release Date: 1 November 2011
Type: C64 Crack
Code - enthusi, Sorex
Trainer - Slator, Sorex
Linking, Bug-Fix, Test - Sorex
Help - Slator
Note that (Prince of Persia Saver 0.1) is a test-release tool, +9 is the most recent/advanced tool.
Prince of Persia 1 for Commodore 64
Code - Attila Pohorai, Viktor Varga
Music - Balazs Takics
Graphics - Attila Pohorai, Viktor Varga
Review (by Frank Gasking)
The princess has probably gotten bored waiting for a prince in this C64 conversion...
Around the same time that MOOD made a big impression with C64 sceners in 1996/97, Pohari Attilla put together a preview which would get many fanatical game's players excited, including the C64 crowd.
Even though the classic Prince Of Persia was converted to almost every format in existence, including the Spectrum and Amstrad by Domark, the C64 version for some unknown reason was missed out. Sad, because every version that came out was a huge hit.
It's unknown actually if the C64 did have an official version in the planning stages, though the non existence of a C64 conversion was about to be rectified.
A series of stills were released as a slideshow preview, showing various screens of the game on the C64. It was just impressive to see the game making some kind of form on our beloved breadbin, but behind the hype it seems that Prince Of Persia looked a little off color and plain with its shades of cyan and blue.
And even though a lot of screens were in the preview, there was no main character to look at, or any action whatsoever... just some stills and a good conversion of the game's Arabian tune.
Once the excitement died down, so did any sign of more news of the game. The guy behind the graphics contacted GTW and mentioned that the game hasn't been scrapped, but no more has been heard and it seems as POP has finally been stopped.
It is not known how far the game ever reached, and even if the main character was present and running around, just like the original game. Hopefully contact with Viktor will help us find out some more, and even see some glimpses of what had been done.
But as another hunt.. does anyone know if Domark planned a C64 conversion too?... I mean, a conversion on the Sam Coupe aswell, and no C64 version??.. crazy :)
Note: Frank Gasking review has some false information: "including the Spectrum and Amstrad by Domark" - False, it's from Nicodim.
Download Page: http://noname.c64.org/csdb/release/?id=4527
PS: PoP 3D's official website says that this game was actually published. However, it was not. Viktor Varga says he has never finished it. It is possible that another team has finished another version, possible but highly unlikely.
http://www.princeofpersia3d.com/html/leg/leg_body_1.html page: "The game was published first on the Apple II platform, but soon made it to virtually all platforms in existance at the time including: DOS, Macintosh, Amiga, NES, SNES, GameBoy, Sega Genesis, Sega Mega Drive, Sega CD, Game Gear, Commodore 64, and FM Towns."
PoP 1 Commodore 64 Intro Music
This is the introduction music (created by Balizs Takics (Taki) 1995 Natural Beat) of PoP1-C64 version (Music SID). The commodore 64 version of PoP1 (started in 1993) was delayed; thus, canceled, for, all the works were lost (but still available on tapes); however, a playable demo with moving sprites, collision check and so forth had been released. I, also, received months ago an e-mail from the author about the project (Attila Pohorai) :).
SID, A commonly used short form to refer to the MOS technology SID 6581, the sound chip of the Commodore 64 home computer.
The MOS Technology 6581/8580 SID (Sound Interface Device) was the built-in sound chip of Commodore's CBM-II, Commodore 64, Commodore 128 and Commodore MAX Machine home computers. It was one of the first sound chips of its kind to be included in a home computer prior to the digital sound revolution.
Together with the VIC-II graphics chip, the SID was instrumental in making the C64 the best-selling computer in history, and is partly credited for initiating the demoscene.
The SID has U.S. Patent 4,677,890 , which was filed on February 27, 1983 and issued on July 7, 1987. The patent expired on July 7, 2004. ...
SID Music: Music created with the SID synthesizer chip, which can be found in the Commodore 64/128 line of homecomputers.
Download file: princeofpersiasid.zip
Download the sidplay2/w player: http://www.gsldata.se/c64/spw/ (Click on the Download button)
Play the music through Cubic Player
Prince of Persia 1 sid file is included in Cubic Player. Get it from here and load PoP1 music.
Sprite data conversion
Info/Download link: http://www.lemon64.com/forum/viewtopic.php?t=32129
Story behind the developing of this version
- By Attila Pohorai
"Million years ago (maybe i should use, once upon a time...) we decided to develop the POP to C64 just for fun. The original idea came from Vic (Viktor Varga), and I was very happy to do something useful, as I had some programming experience in assembly. So, we started the "project" and made some progress. Unfortunately I never met with Balazs in my life, but he made this awsome music. By the way, congratulations mate! :-)
I wrote the code to display all of the levels, and also created the sprites for some characters. At that time I just had a tape, and I never had a floppy drive until I bought my first PC, so we exchanged the code not very often with Vic. Can you imagine that situation, when you have the turbo assembler on one tape, in different tape counter for each individual hexa start point? :-) It was fun...
So, later on Vic used the latest code, what he had, and made the demo, what you can find on the net some places.
However I still have somewhere on my old tapes a working version of POP1, where you can walk with the main character across the tunnels.
Unfortunately I don't know, where is this tape, but I hope, I'll find it someday. Nowadays I'm working on mac computers, and I don't have a C64 anymore, but I decided to buy a C64 on ebay, and find my old sourcecode!!! I have to refresh my C64 knowledge, but I think, will be OK within a few days...The last several years I was working on unix/mainframe computers, and doing business integration/implementation projects, but I really interested in to publish a quite working version to the world :-)
Jeees, it was so fun!!!! :-)
Thanks to Jalal, to find this site! :-) Attila Pohorai :-)"