forums.ps2dev.org

[superfrog12]

Hello,

Would it be possible to develop a software PSX emulator for the PS2? Is the PS2 hardware powerful enough to do this, seeing how the EE CPU is also a MIPS chip like the MIPS3000A of PSX? It is the idea so that IOP can still be accessed and used for other thing as opposed to normal PSX emulation on PS2...do you think it is possible at all?

thank you

[Jim]

You can already play all your PS1 games on PS2, so what are you asking?

Jim
_________________
http://www.dbfinteractive.com

[superfrog12]

hello,

i wish to save and load psx savegame to the usb stick, but i think it is impossible to do with ps2 emulation because psx games run on the IOP. i wish to know if you think it is possible technically..

thank you

[yoshi314]

yes it is.

ps2 has already a ps1 cpu, which makes things easier (less overhead - you don't need to emulate the ps1 cpu, only the other chips). unfortunately it's used for all i/o, so you would have to somehow share it between executing r3000 code and i/o . i hope it's possible to access all ps2 memory from iop - that would make things much easier, and free up some iop ram for other purposes.

[protomank]

Potentially, a PSX emu for PS2 could be like the ones from PC that even improve speed and graphics:
- no need to emulate CPU
- more ram and vram
- but needs to emulate the GPU, so the graphics can be improved.

I think no one will be doing this, but it is fun as a "science school project" :D

[cosmito]

[dlanor]

It is indeed true that ffgriever has written an emulator known as PS2PSXe, which as yet is available only to a limited set of handpicked beta testers, including myself.

This emulator already has the same level of compatibility as the emulators for PC known as PCSX and ePSXe, which means that nearly all games work with near perfect graphic rendering. And a new workaround unique to this emulator even allows most sub-channel protected games to run even if the sub-channel files are missing (as for non-CCD rip attempts).

But PS2PSXe has no real sound implementation at all yet, but only a dummy SPU unit (to prevent lockup for audio functions).

And the emulator is still quite slow in many games (especially for 3D engines).

So a proper SPU implementation and a speed-optimized GPU reimplementation were the next steps in the original plan (appx a year ago !!!). But then other things intervened causing ffgriever to invest his time in other projects instead (notably the ESR method for backup games and the recent translations of the games "Okami" and "FF12 IZJS").

I sincerely hope that he will have time to take up work on the PS2PSXe project again (and soon), as it is a great project which deserves a public release ASAP. (IMO even without the speed and SPU improvements...)

Best regards: dlanor

[yoshi314]

i'm still wondering, if ffg has trust about his beta testers (because there was no leaked copy of the emulator, i figure he picked out right people), why doesn't he invite some more accomplished ps2 homebrew devs to help out with development?

[superfrog12]

maybe because there is not many accomplished ps2 developer left? i think in this forum in early times there was alot very knowledgeable people like mr.brown, gustavo and herben and some other, but they all move on long time ago, no? if you look at old threads you will find very many interesting ones, but today not so much anymore.

but maybe he could just make it open source so everyone who likes can take a look or is there a reason against it?

[cosmito]