It looks like PS4 Parappa Remastered is the PSP game running under emulation

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Would you believe that the PlayStation 4 remaster of Parappa the Rapper is actually the PSP version running under emulation? That’s the remarkable claim put forward by hackers using compromised PlayStation 4s to examine game code, first revealed by ‘KiiWii’ on the GBATemp forum (with a tip of the hat to Ars Technica for its write-up of the story so far). The actual remastering – such as it is – appears to come in the form of a high resolution texture pack that swaps out the original PSP assets for renditions more becoming of a current-gen system.

The evidence here is compelling, with several hackers providing proof of a small number of other PSP titles running on PlayStation 4 using the same emulation wrapper. Essentially, within the PS4 package, a configuration file points to a PSP UMD disc image, which – in the case of Parappa the Rapper – apparently has the same MD5 hash as the original PSP game, confirming that it’s original, untouched code. The configuration file itself suggests that Parappa is running under an all-purpose emulator, with a number of options including the ability to choose between multi-sampling and super-sampling anti-aliasing, plus a toggle on the L3 button to swap between original textures and any remastered replacements.

Further research from hackers has led to a small number of other PSP games running on PS4, apparently confirming that it is a general emulator working behind the scenes here, as opposed to any code bespoke to Parappa only. Compatibility does seem to be highly limited at the moment though. The implication is that further PSP titles released on PS4, such as Loco Roco and Patapon, may also be using the same technique, as injecting the original PSP code for those games into the emulator seems to work fine. Since the original Parappa revelation, ‘injector’ tools have been released that swap out the Parappa UMD image for one of the user’s choosing, with the resultant files only able to run on compromised PlayStation 4 consoles. The list of games running on the emulator seems to be very limited, however.


Emulation it may be, but the new artwork certainly makes a huge difference. Only the remaster’s 30fps frame-rate raised eyebrows when it was released.

On the one hand, the existence of a PSP emulator for PlayStation 4 is hardly surprising – a PS2 emulator, which offers improved performance and a 4x resolution bump – is already available, and allowed Sony to launch its PS2 Classics range. Similar to the PSP hacks going on now, this too has been compromised to run many more PS2 titles on hacked PS4 consoles.

What is surprising – maybe even a little cheeky – is that Sony is re-selling old PSP code with refreshed textures on its current-gen machine. Parappa, Loco Roco and Patapon cost £11.99 each, or £24.99 in a bundle pack. Despite their PSP origins, the results do actually hold up though – nobody figured it out at launch, and Sony even put out a playable demo for Parappa, so everyone considering a purchase could experience the quality of the remaster before laying out any cash. Our only real gripe with the it at the time was its mystifying 30fps frame-rate. This, at least, is finally explained.

We’ve asked Sony for comment on this and will update if the firm has anything further to add.



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