Chris White - Emulation!

Friday, January 28, 2005

- Fixed a problem in the CPU core with the RTI instruction, (switching the Accumulator to and from 8 and 16 bits after popping the status register from the stack). Solved graphical corruption and problems in loads of games, including Contra 3:

- Bugfixed HDMA support, fixing a bunch of Commercial ROMs (Zool, Turrican 2 etc.).

- Corrected some SRAM mirroring issues, meaning Mario Allstars passes the protection check. Not entirely convinced I've nailed SRAM yet, as there are some other issues...

- Added HIROM support. Probably buggy for now, but good enough to get a decent number of titles running.

- Added a bunch of new opcodes. Roughly 230 out of 255 opcodes are now implemented. I add them as I come across ROMs using them, which helps prevent silly bugs.

- Thanks to the Snes9x forum for helping out with a couple of issues. Who knows, we might see a source code release in a few months.

As usual, if you can help out, please contact me.

posted by yt at 1:14 PM

18 Comments:

  • Have you considered looking at source code for ZSNES or SNES9X and simply porting over the superb code? Unless this is simply an exercize in coding, which is totally cool. Keep up the good fight.

    By Anonymous Anonymous, at 12 February 2005 00:40  

  • I've used some existing code for reference, where documentation is poor. However, it's also just a bit of fun and experimentation - so I'm not directly porting an existing emulator.

    By Blogger Chris, at 15 February 2005 10:10  

  • Chris,
    I love your idea of a Java Snes Emulator, but I can't find the actual files ANYWHERE, I have searched all around, And I would GREATLY appreciate a little help to where I can get your emulator.

    Thanks
    JohnnyC@9qa.com
    JohnnyC[AT]9qa.com

    Do you have it in a applet form for a website, I have a geo cities website right now and I'd like to put up Super Mario World 2 for SNES on my website and I need a java applet emulator to do that. Thank you SO MUCH, and YOU ROCK!!!!

    By Anonymous Anonymous, at 21 February 2005 21:43  

  • Hey, JohnnyC again, I read on a page that you were releasing it OpenSource License which is awesome once you are satisfied. Not shure when your going to be satisified, but I would REALLY love to help you out, beta test, I have litterally near every SNES rom in existence (including all languages), downloaded them from some huge collector which actually had a list of like 10,000+ different roms (every variation thereof), and I'd like to help you out. Testing out things and tweaking, etc... If it even works for one game partially it's enough for me ;)

    Thanks again, I guarantee you that if you release a beta version I could test, it will NOT get out to anyone, I'm not a jerk like that or anything, it will stay with me only, unless you want otherwise ;)

    I saw JavaGear, I think I tested it out before (not sure), but the one I used was pretty sweet.

    (Just wondering, have you ever heard of a Macromedia Flash emulator for Snes or is that not even possible? Flash is alot 'smoother' than Java in my mind for some reason, but Java still rocks! )

    Thanks again and expect your email soon~!
    JohnnyC[AT]9qa.com

    By Anonymous Anonymous, at 21 February 2005 21:53  

  • Hi Chris, I run www.EveryVideoGame.com. We host several other emulators, NES, SMS, GB, arcade and others coming soon. Would you be interested in adding JSNES to the list?

    By Anonymous evg@EveryVideoGame.com, at 22 February 2005 14:51  

  • Thanks for the comments.

    JSnes is a personal project, which I develop during moments of free time (somewhat limited at this time).

    At the moment, despite running a reasonable number of basic commercial titles, it is not optimised and not really in a state ready for general use.

    It will be released (eventually), but there's still a fair amount to be done!

    By Blogger Chris, at 03 March 2005 10:38  

  • Hey Chris, It's JohnnyC[AT]9qa.com again.

    How's the project comming? Just thought I'd check in, I'm really anxious to see it and get it up and running on a website.

    I hope all is well and you've found some time to make progress and it hasn't become a dead project, I'd really like to help out if you want, anything to speed up the release, even if it only partially works on SOME or fewer games, it's better than the nothing I have now...

    Cheers~!

    By Anonymous Anonymous, at 27 March 2005 21:20  

  • Chris, my friend, how is the project coming along?

    This is JohnnyC[AT]9qa.com again, just checking in, it's been like 5 months since your last post/reply, I'm wondering is the project still alive or is it dead or what's up?

    I'd really like to talk to you so if you can please email me back, that would be tight, I think i've tried emailing you multiple times, no replies.

    I'm really interested in the project and how's it coming and more details I'd like to discuss in private.

    Please contact me at your earliest convinence.

    I'd be really cool if your done with it and will release it soon, I just get the real feeling you gave up due to lack of time and what not, and the project is dead since you haven't updated in 5 months, however I hope I am very much mistaken and it would be tight if it's ready for release.

    By Anonymous Anonymous, at 03 June 2005 19:52  

  • hey man.. this is really interesting and seems to be progressing nice (or was since you hadnt posted in a while).. why dont you create a project at sourceforge? i 'd be happy to help you with it.. I work as a software engineer and i m making a j2me gameboy emulator..

    regards,
    Marcelo Camanho

    By Anonymous marcelo camanho, at 21 July 2005 00:22  

  • Hi, if you need some help in snes technical areas or coding, let me know. ymagnien@gmail.com
    I've ported/rewritten/optimized snes9x for handhelds (gp32, palm, psp), you can check at http://yoyofr92.free.fr

    By Blogger yoyofr, at 26 August 2005 16:43  

  • Hi there, I'm actually working on a Snes EMU based in .NET Framework. I'm having framerate issues so I was wondering (since the platforms are more or less alike) how was your performance and BTW, how do you emulate flags??

    By Anonymous Anonymous, at 28 September 2005 05:03  

  • Hey Chris! How's the project coming along? I kinda figured slowly since the lack of updates. But hope everything is coming along and try to keep us updated if you can!

    By Anonymous Michael, at 08 November 2005 02:46  

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    By Blogger eddybrinick31205954, at 20 January 2006 05:22  

  • Hey dude, where I can download it?
    And do you think in put it on a applet like the http://www.vnes.thatsanderskid.com/ ?

    By Anonymous Anonymous, at 17 October 2006 19:40  

  • Download?

    By Anonymous Anonymous, at 04 February 2007 18:30  

  • Hey Chris, Any updates? Just wondering how things are coming along.

    By Anonymous Michael Long, at 19 March 2007 17:01  

  • Jemu2 webstart doesnt work with my jre1.6 update 3 on Windows XP SP2.
    Error on permission for nativelib (gl)

    By Blogger Clovis T., at 09 October 2007 18:54  

  • I really want to port your emulator to j2me, and optimize your source code, please realese it in sourceforge,

    By Blogger Zer, at 08 December 2007 11:55  

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