Giant PlayStation button icons.
/ Giant PlayStation button icons.

Sam Machkovech


A Japanese patent application just recently submitted by Sony Interactive Home entertainment is being seen by numerous as a tip that the next PlayStation might be totally backwards suitable with PS4 software application. Nevertheless, a close reading recommends the patent might likewise explain existing approaches to get initial PS4 software application dealing with the PS4 Pro.

Patent Application 2019-503013(as found just recently by the Hokanko-Alt blog site) explains a technique for “impersonating CPU ID for backwards compatibility.” A maker translation of that patent information a technique for “tricking tradition application[s]” into believing they are operating on the initial CPU they were created for, instead of a more modern-day processor. This is performed in part to avoid “synchronization mistakes” that might “too soon overwrite the information still utilized by another part of a brand-new gadget,” due to speed distinctions, for example.

That definitely seems like it might explain a method to run older PS4 video games efficiently on a pending PS5. However it might likewise explain what the PS4 Pro currently does to run applications coded for the slower initial PS4.

In between the lines

The maker translation uses some inconclusive evidence for that type of reading, referring to “the high variation (‘ brand-new gadget’) of a computer system.” A human translation of that line offered to Ars states the patent describes a “brand-new variation of a computer system” that’s upgrading a “previous system variation (‘ tradition gadget’).” Both of those noise a lot like a PS4 Pro-style upgrade and not always a completely brand-new console generation.

What’s more, the Japanese patent likewise refers back to and updates an existing United States patent application for “replicating tradition bus habits for in reverse compatibility.” That patent, submitted 3 years back (i.e. right before the PS4 Pro’s release), states that “when brand-new computer system architecture is launched it is preferable for the applications composed for a previous variation of the architecture to run perfectly on the brand-new architecture.” In truth, both patents appear to share the exact same direct translation of the “background” area that includes this sentence.

Instead of concentrating on CPU ID spoofing, however, the United States patent appears to straight explain the bus-throttling CPU mode utilized to enable video games created for the initial PS4 to run perfectly on the PS4 Pro. That’s the exact same bus throttling that.
Sony would ultimately disable for the PS4 Pro’s optional Increase Mode(though Sony does caution that mode can cause “unforeseen habits”).

Tips and whispers

None of this indicates that Sony is.
not thinking about backwards compatibility for the PlayStation 5, naturally. In truth it’s still uncertain if the next PlayStation (which.
might be a methods off) will form a “tidy break” with the PS4 generation at all. The “PS5” might merely.
be another PS4 Pro-style upgrade, with a continuing software application library that works throughout brand-new and old hardware.

There are likewise reports that AMD is currently dealing with Zen-derivative x86 processors for the next PlayStation. Such an architecture would be quickly suitable with the PS4’s own x86 chip and make backwards compatibility reasonably simple to manage. That’s particularly real when compared to the special and complicated dual-chip architecture that apparently made the PS3 such a problem to establish for

For what it deserves, Digital Foundry’s John Linneman likewise just recently tweeted that there is “absolutely no concern” that the PS5 will be backwards suitable with PS4 software application.

At least, this freshly found patent application recommends that Sony still values and wishes to secure its backwards compatibility innovation. However whether that patent explains innovation for future or extant PlayStation systems is still uncertain.