How can I get to 64bits mode without OS?

May 9, 2019 at 04:58:31
Specs: None
I just know how to get to safe mode in 32bits intel CPU, but I don't know how to get to 64bits mode in 64bits intel CPU with Assembly. Can you help me?

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May 9, 2019 at 05:11:22
"but I don't know how to get to 64bits mode in 64bits intel CPU with Assembly"
If you are still talking about Safe mode.

Start your PC in safe mode in Windows 10
7 ways to boot into Safe Mode in Windows 10
How to Fix a Computer That Won't Start in Safe Mode

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May 9, 2019 at 09:41:52
Safe Mode is a feature of Windows. If you don't have Windows installed, there is no Safe Mode to get into. You also need to understand what a CPU is. Using the correct terminology is important. A CPU (Central Processing Unit) is another name for a Processor, such as this: Intel Processor. THIS is NOT a CPU.

64-bit processors can run either a 32-bit or 64-bit OS; 32-bit processors can only run a 32-bit OS.

Please post your complete system specs.

message edited by riider

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May 11, 2019 at 02:56:28
The Intel Software Developer's Manuals ( ) tell you all that you need to know.

However, I'm not convinced that you have framed your question clearly. What exactly do you want to do, and why?

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May 11, 2019 at 16:24:51
Access to Safe Mode is a key or combination of keys that you tap at start up. What key or keys depends on the brand of motherboard or the system manufacture. What ever edition of Windows you have is the version you get when you go into Safe Mode. If the 32bit is installed the you get 32bit, if 64bit i installed then you get 64bit. There is no other possibility unless you are really meaning something else entirely.

You have to be a little bit crazy to keep you from going insane.

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February 3, 2020 at 14:08:22
I posted in this thread in the last 24 hours, after someone else did.
Both of those posts were removed, I presume because of something
about the other post or the other poster.

I've seen and read this thread more than once since it was started
last May. (Maybe there were other new posts that caused the thread
to pop up again and they had the same problem.) I never understood
why people seem to think the original poster didn't understand what
a CPU is.

The other thing that occurred to me is what the poster must have
meant by "safe mode" I expect that he meant "real mode", which is a
mode that a CPU can operate in. My recollection is that DOS used
real mode, while Windows uses protected mode. I don't know whether
64-bit processors have a real mode.

-- Jeff, in Minneapolis

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April 20, 2020 at 06:21:02
Although either architecture offers the same features, when you upgrade to the 64-bit version, the device will be able to take advantage of large amounts of memory (up to 2TB), instead of only 4GB, which is one of limitations with 32-bit mcdvoice customer survey

message edited by Wardlaws

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April 20, 2020 at 08:48:33
The 4GB limit is not inherent in the processor, although many operating systems impose this limitation. For example 32-bit Windows server enterprise supported 64GB as does 32-bit Linux. (There is, however, a per-process limit of 4GB.)

Actually, the increased register set, along with the bigger registers, is just as important as the address space.

message edited by ijack

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May 7, 2020 at 02:49:10
As for finding out what is actually possible to load you need to look at the Chip Set for the M'Board and the Fitted CPU Specifications to see what it is capable of running but ever since AMD Brought out the Athlons about 6 years ago myprepaidcenter login

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