PSP: Daedalus R12 - New Goldeneye Update: Game running! (10 May)

May 10th, 2007, 23:37 Posted By: blackrave

StrmnNrmn has posted the fourth update post in 24 hours, this time with even greater news:

Ok, I know the last thing I said yesterday was:

Anyway, given the work involved Goldeneye isn't an immediate priority, but I am thinking about it.

I couldn't quite resist having a quick hack to see if I could get Goldeneye working using the third method I outlined. It turned out to be relatively painless to crowbar in the required changes, and I'm pleased to say that I've managed to get Goldeneye booting again!

With the changes, Daedalus now dynamically pages the Goldeneye ROM into the PSP's RAM so that it no longer requires a free 12 MiB. I now check the instruction pointer on every instruction fetch in the interpretive core*, and raise a TLB Read Miss exception if required. If this happens, it causes Goldeneye's exception handler to realise that the required code isn't in memory, and to load it in from ROM before continuing execution.

So here are the first screenshots of Goldeneye running under Daedalus R12 - you can see there are a handful of graphical glitches to sort out, particularly on the main menu:

Not bad for an hour's work!

There's still quite a long way to go though. Firstly, I can still only get the rom running with dynarec disabled on the PSP, so the framerate is currently just 6-7 fps. Interestingly it runs fine with dynarec on the PC with the same set of changes, so this indicates a bug somewhere in the PSP dynarec implementation. Secondly, I've not been able to get in-game yet - it just seems to hang with a black screen shortly after starting to load the level. I've not figured out whether this is just running very slowly without dynarec and taking its time, or if there's another bug to be fixed somewhere.

Getting the rom booting is a great first step though - it can only continue to improve from here

-StrmnNrmn

*I probably want to tidy things up to avoid doing this for most other roms as it can be quite expensive - especially if dynarec is disabled.

Don't forget to leave a thank-you comment at StrmnNrmn's blog! Fantastic work!

For more information and downloads, click here!

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