IDEA : Xbox 360 and Original Xbox main Menu emulation in the Xbox One | Series .

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....they should allow us as consumers to have access to the set of code they used for the emulator...

Xbox 360 and original Xbox games technically aren't being emulated. The games were reverse engineered to run on the Xbox One. They are, for all intents and purposes, Xbox One games running inside an Xbox 360/original Xbox virtual machine. They're not 'emulated' in the traditional sense.

This is why when you insert a BC 360 Xbox game, there is an update to download. This is not an update, it is the full game recoded to run on the Xbox One or Series X|S consoles.

which is why the new Xbox series X is supposed to be able to play almost every game from every generation of Xbox console (including the original).

That's marketing spiel that's been misinterpreted. From how I understand it, the Xbox Series X will run most if not all Xbox One games. Which means at best, 100% BC with the Xbox One. It will also play all the games that currently on the Xbox One BC list
on the Xbox One.

Nowhere have said it will play almost, or all Xbox games from all the Xbox generations.

The problem with making all old games work is a hardware one. The Xbox 360 used a PowerPC 32-bit processor. The Xbox One and Series X use AMD X64 based processors. The Xbox One and the Series X are like PCs and they share the same processor architecture.

BC is achieved on the Xbox One because the BC team (with zero help from the developer) take the old 360 game and reverse engineer it to run on the Xbox One, taking the original 32-bit PPC executable archive and turning it into a 64-bit X64 executable. There's
no software emulation for the game. The only thing emulated in software is the 360 OS.

To run most games, or indeed, every game would require a software emulator for 360 games. A pure software emulator is a lot of hard work, far to complex to explain here.

"Why not use the emulator to run the code that was created for the original systems.... but run it through the hardware on the X|S series. I personally feel let down on this. I run emulators on my Dell laptop that will play EVERY game I own, but the X|S series Xbox can't run AS ADVERTISED".

Hi,

Strictly speaking it's not emulation, not on the Xbox One and Series X|S anyway.

Only the Xbox 360 had a proper software emulator to run the original Xbox games that the BC team tested and configured to play correctly (or mostly correctly) on the 360 console. This type of software emulation could be compared to the same type emulation you're doing on your laptop.

Obviously, it's one thing to emulate a limited system such as a 90's 16-bit console or arcade board and entirely something else when it comes to more complex hardware such as an original Xbox or Xbox 360. Have you tried PS2 emulation on PC? It's not the same as running a Sega Genesis/Mega Drive title via emulation.

When Microsoft decided to create a BC program for running Xbox 360 games on the Xbox One, they needed to take a different approach as pure software emulation just wasn't going to cut it. Generally, for software emulation, you need a system several times more powerful than the target system you're trying to emulate. The Xbox One, while on a technical level being more advanced than the 360, wasn't a great system to emulate the 360 in software. The Xbox One's 8 core Jaguar APU is low powered, more like a laptop CPU/GPU compared to its PC counterparts.

As the Xbox One was effectively too underpowered for software emulation, the BC team approach was to take each game and reverse engineer it from its native 32-bit PowerPC application to a Xbox One 64-bit X86/64 application. This approach made getting older 360 games to Xbox One more complex, but it did give the benefit of actually making the games playable on the system. Software emulation couldn't do that. In fact, only the Xbox 360 OS is emulated in software.

All the games they made BC (with no help from developers either), needed to be run from start to finish to test performance and stability. No mean feat.

Yes, there are now more powerful consoles available. But since Microsoft didn't use a software emulation solution on the Xbox One, to create one now would be a massive undertaking. Yes, it could be done, but at what cost? It's not like you can create a software emulator and all games will just work perfectly on it.

The Series X|S play the vast majority of Xbox One games because architecturally they're the same. No emulation required.

Xbox 360 Backward compatible games need to be downloaded due to the fact the game has to have the emulator installed with it (if you press the menu and view buttons at the same time it brings up the Xbox 360 guide).

That's not strictly true. Xbox 360 games running on Xbox One or Series X|S are not emulated. The 360 and original Xbox games that the BC team made available are, essentially, rebuilt games. The BC team took these 32-bit PowerPC (For Xbox 360) engineered games and converted/recompiled/reverse engineered (or whatever other term you want to use) to be Xbox One native games, running inside an Xbox mini guide emulator or virtual machine.

To the Topic creator:

Since an Xbox 360 BC disc contains data that is not compatible with the Xbox One or Series X|S the user is required to download an 'update' to get the rebuilt game that SwordofWhedon referred to in their post.

I guess 'update' would be a completely wrong word for this, but since most console users are not technically minded, 'update' is probably the best word they could think to use without over complicating things. In the end it's all just semantics.

Only the Xbox 360 mini guide is actually emulated and even that term wouldn't be quite correct.