Digital Foundry performed an extensive test on it. PS1 PS2 and PSP games inside Backwards compatibility available on PS4 and PS5 via new subscription PS Plus Premium with results they are not satisfactoryin this case too.
We’ve also seen outright rejection by ElAnalistaDeBits, but in this case, the analysis is much more in-depth, as usual for Digital Foundry. In any case, the backward compatibility of PS5 and PS4 is “not good enough,” according to the British column. The good news is that the PS1 emulator used is not the same as the one found on the infamous PlayStation Classic and is more advanced, but shares a wide range of issues with it.
as for your problem 50Hz PAL Also used in NTSC games, the Digital Foundry argues that the solution is not common to all games, but common to most. Oddly enough, Sony’s first batches currently run at 50Hz. As for Ape Escape, for example, interestingly enough, it has cutscenes at 30fps with various frame advance issues, while the game is actually at 25fps.
this constant stuttering and framerate inconsistency It is due to the need to display a 50 Hz code in a 60 Hz container provided for PS5, but the situation does not improve even when choosing 50 Hz as the console output, as the overall slowdown is still noticeable. Even Wild Arms, Jumping Flash, Kurushi, two Worms and Everyone’s Golf are only available in PAL version at 50 Hz, despite being the Asian series of PS Plus. 60Hz and they look much better.
when it comes solutionOn PS5, classic games are upgraded to 192×1440, resulting in much more defined polygons and textures, but there are issues in terms of subpixel accuracy with floating-point operations, related to a lack of precision, according to the Digital Foundry. The result is a certain inconsistency unique to PS1 games, where unstable 3D models have perhaps an even worse effect with increasing resolution.
options for i filters not believable compared to other emulators or dedicated retrogaming machines: Default and Modern are very similar, the latter increasing the contrast resulting in a darker image, while the Retro Classic option offers a scanline filter that looks good even if it doesn’t. It is in perfect harmony with the effective pixel grid, making it much coarser than the custom solutions seen, for example, in the RetroTink 5x Pro.
options foraspect ratio raise doubts: with simple 4:3 added to a 16:9 window, the default option works fine, but the other options (1:1 and Square pixels) squash the image with incorrect scaling, causing distortions. Judging by the title, these options seem to have been included without fully understanding the impact they are supposed to have.
As for PSP emulation, it’s not a 50Hz issue of course, but there are others. In particular, 2D elements appear filtered and blurry when the resolution is increased from the original 480×272 to 1080p. Also, oddly enough, the PSP has the same filters as the PS1, including scanlines; It’s rather odd that the original console had an LCD screen and not a CRT, so these lines don’t make any sense. Considering that the original screen was already 16:9, the aspect ratio options from the PS1 don’t add up either.
Finally, when it comes to PS2 emulation, it’s basically the same as seen for PS2 Classic on PS5, the resolution has been increased and some issues with emulation seen earlier remain unchanged.
Source: Multiplayer
