PS2 Reverse Compatibility Question

Discussion in 'General Gaming' started by FiZiX, Jan 25, 2018.

  1. FiZiX

    FiZiX Active Member

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    Hello all,

    I'd like to play some classic (mostly 2D) PS1 games on my CRT TV but have some questions:
    • In your opinion, does the PS2 "properly" emulate sprite-based PS1 games?
    • Does it add any noticeable lag?
    • Is the RGB via SCART output as good as or better than the PS1?
    Thanks!
     
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  2. xmog123x

    xmog123x Peppy Member

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    for that and all other questions, I recommend seeing the RGB video on the PS1 by My Life in Gaming:
     
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  3. MonkeyBoyJoey

    MonkeyBoyJoey 70's Robot Anime GEPPY-X (PS1) Fanatic

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    I tried some PS1 games on my SCPH-39001 PS2 with my PVM in RGB before and I couldn't tell the difference between the output of the PS2 and my SCPH-1001 PS1. Everything is colorful and razor sharp. There isn't any lag that I can see.

    Also the PS2 doesn't emulate PS1 on fat models. They have real PS1 hardware. Some of the slims have real PS1 hardware as well, but I'm no expert so I have no idea which ones do. @sp193 would be the one to tell you that.

    You should also check out MLiG's PS2 video as well as their PS1 video linked above. Really great channel for getting the best video quality out of old consoles.
     
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  4. AndehX

    AndehX You got boost power!

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    the 70000 model Slims are the only ones that do not emulate the PS1. All other models after that have some kind of emulation
     
  5. smf

    smf mamedev

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    AFAIK all models of PS2 emulate the PS1 to a certain extent. Up to the 70000 the GPU is emulated, after that the CPU & GPU is emulated.

    PS1DRV has game specific patches, but only for own region games. It was possible to load extra patches from memory card, which is what independence exploit used, however no official patches were ever released.
     
  6. FiZiX

    FiZiX Active Member

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    Thank you all for your insight. It sounds like playing PS1 games on a PS2 is nearly as good as playing on the original hardware!
     
  7. MonkeyBoyJoey

    MonkeyBoyJoey 70's Robot Anime GEPPY-X (PS1) Fanatic

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    I read online that when it comes to the fat models, the Graphics Synthesizer actually runs PS1 games natively, as it is a heavily upgraded version of the PS1 GPU. Also read that the PS1's RAM is included in the GS chip or the EE chip, I don't recall which one. No idea if this is true though, will have to wait for sp193 or even TriMesh to respond.
     
  8. zoom

    zoom Member

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    It may be useful to say that you are likely to be completely happy with your PS2, but be aware you'll need a PS1 memory card for the PS1 games, & you might prefer the original SCPH-1080 controller. Try one. It's lighter than the DualShocks, and my H for Hori 1080 is more precise than any of my small pile of DS's.

    (Quite admittedly, that's too small a sample for useful generalization. Maybe some here with monster collections will chime in.)
     
  9. DeChief

    DeChief Rustled.

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    For me, none of the PlayStation controllers feel good except for the original Dual Analog for PS1 (not dualshock) and the dualshock 4.
     
  10. sp193

    sp193 Site Soldier

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    No, @smf is likely correct. The other side of SIF2 is actually the EE, not the GS. PS1DRV runs on the EE, after the PS2 is switched into PS mode.
    This is also why I patch PS1DRV to change the video mode.

    So the reason why all PlayStation 2 models have some incompatibility with certain PlayStation models, is because it is not a totally 100% hardware-accurate emulator. It got worse at the SCPH-75000 - presumably because they replaced the IOP with an emulated device too.

    On the SCPH-75000 and later, they also replaced PS1DRV with a universal version. So it is possible to get the other compatibility lists applied, if you manipulate PS1DRV (specifically, the region it reads from ROMVER).

    The part that is supposed to be hardware-emulating the PS is the IOP. It was marketed as an "upgraded CPU", but I don't think... it was just an upgrade.
    It has 2MB of EDO RAM, so you can say that it has the PS's RAM.
     
    Last edited: Jan 25, 2018
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  11. notataco64

    notataco64 Rapidly Rising Member

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    What kind of CRT do you have? PS1 games also look nice running on a PS2 via component
     
  12. helakustorm

    helakustorm Robust Member

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    Taken from RetroRGB page:
    I think the quality is the same even if you use RGB or Component on PS2 if you boot PS1 games.
    About the 7700x and 9000x consoles, I have them and I've tried a few games. I didn't saw any glitches.
    I've tested the games that are official incompatible with PS2 7000x-9000x and they indeed have that glitches or not works (https://en.wikipedia.org/wiki/List_of_PlayStation_games_incompatible_with_PlayStation_2#All_models).

    By the way does anyone know what US/EU PS1 games are not compatible with PS2 7700x and 9000x instead of that list?
     
    Last edited: Jan 26, 2018
  13. The-Silmarillion

    The-Silmarillion Spirited Member

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    All I can say is that if you turn on the PS2 features (smoothing etc.) it makes objects in MGS flicker, it is also prone to crashing after the disc change and during the end credits (so you don't hear the last conversation).
     
  14. MBMM

    MBMM Powered by Pied Piper

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    That works? Maybe I have a bum component cable for my PS2 but I could never get PS1 games to work when that cable was plugged into my PS2.
     
  15. sp193

    sp193 Site Soldier

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    On the SCPH-10000, the English text reads "Compatible" instead of "Standard". So it means that Sony expected some games to develop some problems, if some of these enhancements are used.

    It might be a compatibility problem with your TV. Maybe it is one of those that do not support non-interlaced NTSC/PAL via any interface, other than composite.
     
  16. MonkeyBoyJoey

    MonkeyBoyJoey 70's Robot Anime GEPPY-X (PS1) Fanatic

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    Ah, that makes sense. I guess what I read is wrong after all. Thanks for chiming in and explaining it!
     
  17. DeChief

    DeChief Rustled.

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    This is kind of off topic but I don't know if it's worth making a separate thread, and OP might be interested in hearing the answer too, so:

    What's the best way to play PS1 and PS2 games on one console? Should I look for a specific PS2 model, or go for one of the early PS3s? I'm looking for the best in terms of compatibility.
     
  18. helakustorm

    helakustorm Robust Member

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    I've read an article some time ago about the Game Boy Advance backward compatibility where they said that some j-titles for Game Boy and Game Boy Color didn't worked at all or worked but without some features (don't know if this was a hoax or was true).

    Here is an article about playing GameCube games on the Wii consoles: http://retrorgb.com/gamecubevswii.html

    But in terms of compatibility from my point of view, you will have to use each console.
     
    Last edited: Jan 27, 2018
  19. MonkeyBoyJoey

    MonkeyBoyJoey 70's Robot Anime GEPPY-X (PS1) Fanatic

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    I think you posted this in the wrong thread by mistake lol. This thread is for original PlayStation games on a PlayStation 2, not Nintendo stuff.
     
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  20. speedyink

    speedyink Site Supporter 2016

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    Lots of PS1 games run in 240p, which some TV's don't support. This is an issue with component because the TV then has to support a mode for 240p.
     
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