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Published on July 22nd, 2012 21:45
PS2 backwards compatibility remains something of a contentious issue for PlayStation 3 users. US and Japanese launch models featured the principle PS2 hardware built into the system, making for excellent support for almost all legacy PlayStation titles and the ability to run older games with a precision HDMI output. By the time the EU launch rolled up months later, the design was altered, removing the PS2 CPU - dubbed the Emotion Engine - and replacing it with software emulation to mixed results. With Sony still haemorrhaging cash on PS3 production, all PS2 components were removed by October 2007, and backwards compatibility was no more.But the story doesn't end there. Behind the scenes, Sony has been working on restoring PS2 support for all PlayStation 3 consoles regardless of configuration, and we've now reached the point where you can visit the PlayStation Store and download 74 "PS2 Classics" - in truth a roster of immensely variable quality, with only a smattering of stand-out titles. Warnings are given out that the games are running under emulation and may vary from the original PS2 experience, but the real kicker is that you'll have to pay for them - even if you own the original discs. While lesser known games cost between £0.99 to £3.99, most of the titles cost £7.99 a pop.Value issues aside, we wanted to find out more. From a technical perspective, the notion of original PS2 code being able to run under emulation on the PlayStation 3 is a seriously impressive feat of engineering. Ken Kutaragi's finest hour hails from an era where games machines featured custom components built from the ground up, a necessity in an era where PC parts were too expensive to be crammed into a console box. The Sony R&D team responsible for the PS2 software emulator have achieved something of a miracle here - the design of the older console is completely alien to the hardware set-up of the PlayStation 3. The PS2's graphics synthesizer GPU in particular, with its attached eDRAM, offers levels of bandwidth that even the RSX may have issues duplicating."Having phased out support for PS2 backwards compatibility, Sony has been working behind the scenes on a full software solution for all PS3 owners - and the results are impressive overall."
Virtua Fighter 4 Evolution running on three different PS2 emulation schemes - full hardware back-compatibility via a PS3 debugging station (equivalent to an NTSC launch unit), an EU PS3 with partial hardware support and finally the software emulator that runs on any PS3. On this game, the EU machine appears to have a slight blur, while the full hardware model has some poor deinterlacing (only really noticeable in motion). The emulator deinterlaces nicely, generally speaking, giving a 480p-style presentation.
Out of a library of thousands of games, the fact that only 74 are currently available suggests that the emulator remains a work in progress, that many games simply don't work at the moment: not surprising bearing in mind how many developers pushed the system's architecture in ways its creators never even conceived of. Additionally, it is perhaps telling that the big Sony exclusives have no representation - even games that are certain never to get an HD remaster are conspicuous by their absence."We set out to test PS2 emulation on a number of platforms - full hardware backwards compatibility, partial PS2 support from the EU launch PS3 and finally, the new software emulator."
Regardless, we delved into our PS2 game collection, dug out some titles available on the PlayStation Store and ran them on three different PlayStation 3s - our launch debugging station (which runs any PS2 game from any region under full hardware back-compat), an EU launch unit with the hardware graphics synthesizer and emulated Emotion Engine, and finally, a newer PS3 with no hardware support for the older console at all. The latter turned out not to be required at all, so it was quickly disposed of: even if you're running a launch NTSC unit with all the original PS2 hardware contained therein, the PSN downloads still run completely under software emulation.First up, the game that gave us the most curious results of all: Virtua Fighter 4 Evolution. This is a title that relies completely on its 60Hz update - the fundamental interface between game and player is based on that locked frame-rate. As you might expect, there were no problems at all for our debugging station: aside from a couple of tiny, almost imperceptible glitches on a handful of the stage intros, there were no issues with frame-rate at all. The emulation works out OK for the most part, though the glitching does seem to intrude occasionally into gameplay. However, on Jeffry's stage, the effect is far more pronounced, with the game often slipping into what feels like slow motion with dropped frames and borked deinterlacing, resulting in screen-wobble. In these areas, the quality of the gameplay is fundamentally compromised.Switching the game onto our EU launch PS3 with Emotion Engine emulation, we find a curious middle-ground
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