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VampireBuddha [DATA EXPUNGED] from Right behind you. Just keep typing. Relationship Status: Complex: I'm real, they are imaginary
Feb 4th 2019 at 2:26:24 AM

That is not how backwards compatibility works.

The PS4 uses a slightly modified AMD 64 CPU and Blu-Ray discs, but can also play DVDs.

The PS3 uses a a Cell processor; like the PS4, it runs games off Blu-Ray, and can also play DVDs.

The PS2 uses its own proprietary RISC... thing, and runs games off DVD.

The PS1 uses an off-the-shelf R3000 CPU, and runs games off CD.

The Emotion Engine used in the PS2 has a CPU that implements the MIPS III instructin set, which is fully backwards-compatible with MIPS I used in the R3000. This, coupled with the fact that DVD players are designed to be compatible with CD players, means the PS2 implements PS1 compatibility in hardware, so PS1 games work automatically bar a few edge cases.

Cell is also RISC, but uses the POWER instruction set, which is not fully compatible with MIPS. This means that backwards compatibility has to be done in software - in other words, through an emulator. Early PS3 models did include a full Emotion Engine for PS2 compatibility, but this was removed in later revisions as a cost-saving measure.

And then AMD 64 is CISC, which is fundamentally different to the RISC processors used in previous consoles; it's actually the sort of thing that's in your PC. CISC and RISC instruction sets differ at a very fundamental level, and so again, backwards compatibility has to be achieved in software. This means that if, as is likely, the PS5 also uses x86, it will be able to emulate a PS4 in hardware, but PS3 and earlier will have to be done in software, and writing a PS3 emulator is no small task; not only that, but the PS3 is a decently powerful computer, so it will need a whole lot of RAM and CPU power to operate. (The PS1 and PS2 already have decent first-party emulators, so they can reasonably be ported and should be able to run comfortably on the PS5).

Also, the Rerez guys suspect that the PS5 won't have a DVD player, just Blu-Ray. This would mean that you won't be able to insrt and run a PS>4 disc; rather, it's more likely that those games will be offered as digital downloads.

Feb 4th 2019 at 3:45:09 AM

PS 5 won't have a DVD player, just Blu-Ray
I think that is unlikely, the cost of a DVD lens is extremely negligible and if they really want to push backwards compatibility they will need it.

BadWolf21 The Fastest Man Alive
The Fastest Man Alive
Feb 4th 2019 at 4:56:18 AM

Also, every commercial Blu-Ray player is capable of playing DVDs. No reason to leave it out unless Sony has a new physical format they’re trying to push (unlikely).

LeGarcon Blowout soon fellow Stalker from Skadovsk Relationship Status: Gay for Big Boss
Blowout soon fellow Stalker
Feb 4th 2019 at 5:13:06 AM

Disks are probably going to be on the way out soon though for physical games. You can't pull data off a disk fast enough to play modern games, which is why you have to install your games on the PS 4's hard drive even if you have a disk.

Cartridges work much better and we'll probably see more of them like the Switch has.

Oh really when?
VampireBuddha [DATA EXPUNGED] from Right behind you. Just keep typing. Relationship Status: Complex: I'm real, they are imaginary
Feb 4th 2019 at 5:17:39 AM

[up]That's why one version of Microsoft's new XBox won't have a disk drive.

[up][up]True enough. What about the laser?

Feb 4th 2019 at 5:22:42 AM

We'll be back on cassette tapes before you know it.... that or maybe laserdisc has a chance to shine again!

Feb 4th 2019 at 3:20:08 PM

[up][up][up][up][up][up]Thats not what the patent is describing. The patent is talking about creating a virtual machine to run the software, not designing the Ps 5 to run the discs natively - you cannot patent that.

You're not running the software on a Ps 5, which can read ps4 discs and software, and run the files on it. You are running it on a Ps 4, the Ps 4 just happens to be digitally recreated inside the Ps 5. They can also digitally recreate a ps3, a ps2 and a psx. Significantly less advanced machines, and thus, far easier to digitally recreate.

Feb 5th 2019 at 2:59:23 PM

@ qwigly That is how I interpreted what I read as well.

Redmess Redmess from Netherlands
Feb 19th 2019 at 6:12:40 AM

Samsung will no longer make blu-ray players for the US.

Will this have consequences for what media the next Playstation will use? It seems like blu-ray is not particularly popular.

BadWolf21 The Fastest Man Alive
The Fastest Man Alive
Feb 19th 2019 at 6:14:07 AM

Blu-Ray is a Sony product, so probably not.

TargetmasterJoe Much more than meets the eye! from The City, USA Relationship Status: I like big bots and I can not lie
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