DeSmuME PSP Unofficial Useless Edition - Nintendo DS Emulator for the PSP

**Classic80s** · August 14th, 2007, 00:51

day run ps1 emu ful speeds y dont some1 port ps2 emu?

**acn010** · August 14th, 2007, 01:19

cause it needs 700mhz of speed and the psp only runs 333mhz

**PSmonkey** · August 14th, 2007, 02:00

Ok, time for me to give my two cents.

Discussion on NDS emulation is getting a little retarded so I though my two cents might be of some use.

I get what Exophase is saying and where he is going with things but I don't think it's worth hampering the hopese of NDS emulation being posible on the PSP. Sure for quite a few games it wont be fun or worth doing but trutfuly alot of DS games don't require you to view both screens or use touch screen at all to play. Thies games could posibly be targetd for emulation and made to a playable state (Games like Mario 3v3, Mario 64 DS, etc...).

Anyways for a dirty port of a badly optimised emulator, the results I would say are rather hopeful. I think if someone took the time to start from scrach ans build a solid Arm-Mips recompiler, some games could very well run at a playable framerate above 30fps.

The DS is not some powerhouse, hell it's actualy pretty week. Even more so, the arm7 is not used by developers directly (its all used by the dev API which does alot of sub task on it) so most of it could probably be HLE with just the Arm9 needing emulation. Second yes there are 2 screens which means 2 2D processors but truthfuly quite a few games (mostly ones that would be playable on the psp in the first place) dont really need both screens displayed a once. So one can easly just swap between screens or emulate the 2nd display at a much lower framerate (maybe 15fps) and resize it so it's just a small window in the corner. That just leaves 1 main 2D processor (which is identical to the GBA 2D processor with very minor improvements mostly in palettes) and a 3D processor. The 3D processor also is not very complex and is rather limited in what it does. For 2D only titles you pretty much can just ignore the 3D processor. For 3D games, you will find limited use of the 2D processor for simple hud stuff, So there wont be a whole lot of intensive processing there either (with the exception to games like new super mario bros wich uses 3D for mario and the rest is 2D).

Either way, for the games that could be playable on the psp in the first place (limited to no touch screen use), you could posibly get an acceptable framerate to play them a bit (sure maybe not 60fps but 30-45fps might still be enough to play some of them).

Anyways thats just my take from my experience working on the PSP & DS comercialy.

**RunawayPrisoner** · August 14th, 2007, 03:15

Originally Posted by Exophase

Please hold your breath.

... *die* ...I will come back and haunt you tonight...

Anyways, I give up on telling... and now I'm just here to observe... O_x Let the rant go on!

**andwhyisit** · August 14th, 2007, 04:56

Originally Posted by PSmonkey

Ok, time for me to give my two cents.

Discussion on NDS emulation is getting a little retarded so I though my two cents might be of some use.

I get what Exophase is saying and where he is going with things but I don't think it's worth hampering the hopese of NDS emulation being posible on the PSP. Sure for quite a few games it wont be fun or worth doing but trutfuly alot of DS games don't require you to view both screens or use touch screen at all to play. Thies games could posibly be targetd for emulation and made to a playable state (Games like Mario 3v3, Mario 64 DS, etc...).

Anyways for a dirty port of a badly optimised emulator, the results I would say are rather hopeful. I think if someone took the time to start from scrach ans build a solid Arm-Mips recompiler, some games could very well run at a playable framerate above 30fps.

The DS is not some powerhouse, hell it's actualy pretty week. Even more so, the arm7 is not used by developers directly (its all used by the dev API which does alot of sub task on it) so most of it could probably be HLE with just the Arm9 needing emulation. Second yes there are 2 screens which means 2 2D processors but truthfuly quite a few games (mostly ones that would be playable on the psp in the first place) dont really need both screens displayed a once. So one can easly just swap between screens or emulate the 2nd display at a much lower framerate (maybe 15fps) and resize it so it's just a small window in the corner. That just leaves 1 main 2D processor (which is identical to the GBA 2D processor with very minor improvements mostly in palettes) and a 3D processor. The 3D processor also is not very complex and is rather limited in what it does. For 2D only titles you pretty much can just ignore the 3D processor. For 3D games, you will find limited use of the 2D processor for simple hud stuff, So there wont be a whole lot of intensive processing there either (with the exception to games like new super mario bros wich uses 3D for mario and the rest is 2D).

Either way, for the games that could be playable on the psp in the first place (limited to no touch screen use), you could posibly get an acceptable framerate to play them a bit (sure maybe not 60fps but 30-45fps might still be enough to play some of them).

Anyways thats just my take from my experience working on the PSP & DS comercialy.

Finally someone supports the idea.

Maybe a Single-Screen option with the option to switch between screens may turn up in future releases.

**xg917** · August 14th, 2007, 05:25

that idea you mentioned i already summed up. ill quote my post on my compat thread

well as you can see, there are panels at the top and bottom. now what we can do is use your idea to get to the menu of the emulator (holding L and R for a quick 5 seconds) and the pannels will show up and the screen sizes of the game will be alittle smaller as you see in the picture. then you can navigate through the options using the dpad and select with O (or X.. how ever the coder designs the input). saves would be a list of all your saved games and 2 other options: save state and load state. Game would get you back in the game. pictochat wouldnt be there.. lol, controls should be integrated into the preferences so i would change one of the panels to Cheats at the top you see 2 panels, one would say the name of the game that is currently running and i would say that the other one would be selected to restart rom, load new rom, or exit emulator. and lastly. you see the 2 DS screens. you can select one of those screens to set it full screen or what ever other scale available so you only see which ever screen you choose (for games that require only one main screen like mario 64 ds and pokemon diamond/pearl for example). if you select the game panel it shows both screens again on your psp.

i kno its a long read but what do you think? kinda sloppy huh..
it most likely wont happen but we can always fantasize

**PSmonkey** · August 14th, 2007, 05:54

Actualy I just now played a go of Zoo Keeper and was plesently suprised how well the game ran and play at 3fps. Actualy alot more enjoyable then in the old days where I played NGPC games on my n-gage at 3-9 fps.

Zoo Keeper also proves a point for me. The game plays fine with zero use of the touch screen (game still works via d-pad, hey Puzzle Quest worked fine on psp and it's a simular concept). Second the top screen barely changes at all. There is no need for it to render every vsync interupt. Sure in a simple sense atm this probably wont improve the framerate of this emu (the thing needs to be done from scrach), yet it does mean you can inch out some processing time if doing a DS emu.

xg917,
Thats more gui sudgestions with little/zero technical substance. My post wins :P

Just messing with you.

**xg917** · August 14th, 2007, 06:00

lol, just seeing how you would like the idea for gui even though thats not the main problem

also i was basicly directing that to the single screen idea

would u like to step up to the challenge for an NDS emu?
u better do it. ur the only one that seems to support it really

IM jus playin

**PSmonkey** · August 14th, 2007, 06:11

Originally Posted by xg917

lol, just seeing how you would like the idea for gui even though thats not the main problem

also i was basicly directing that to the single screen idea

would u like to step up to the challenge for an NDS emu?
u better do it. ur the only one that seems to support it really

IM jus playin

A tantilising prospect but sadly one I wont do due to conficts (work & a puzzle game i'm developing on the side).

Something i've always wanted to see tackled on the PSP. DS & Saturn emulation.