RE: 32bit and 64bit
- From: "Joseph Lee" <joseph.lee22590@xxxxxxxxx>
- To: <jfw@xxxxxxxxxxxxx>
- Date: Wed, 11 Nov 2009 14:29:12 -0800
Hi,
Well, memory isn't the only one.
As many people have said, 64-bit means that we can use more than 4 GB of RAM
on a computer. Currently, the CPU family of today supports up to one
terabyte (40-bit) of memory (well, the designers at AMD, the originator of
modern 64-bit in the form of X64 thought that 1 TB is sufficient for now).
As for security, there is a new feature on the 64-bit called "Execute
Disable." This means that a portion of memory that is set to "read-only"
cannot be run by a code (sorry, somewhat hard to explain this concept).
There are other enhancements besides these two.
As for compatibility of 64-bit with JAWS, you cannot run a 32-bit version of
JAWS on a 64-bit computer. This is because the 64-bit computers (more
specifically, thye operating system) uses different driver model. So, a
32-bit version of JAWS with a 32-bit drivers on a 64-bit driver model will
not take advantage of newer features of 64-bit machines. Nor using 64-bit
version of JAWS on a 32-bit model.
Well, 64-bit and 32-bit is somewhat hard to explain in plain language. This
is as so far as I can go. Sorry if some of the materials were hard to
understand.
Cheers,
Joseph P.S. Good thing that I am majoring in computer science instead of
computer engineering.
From: jfw-bounce@xxxxxxxxxxxxx [mailto:jfw-bounce@xxxxxxxxxxxxx] On Behalf
Of Daniel McGee
Sent: Wednesday, November 11, 2009 2:21 PM
To: jfw@xxxxxxxxxxxxx
Subject: 32bit and 64bit
Hello everyone, I just wanted to know what is the difference between a 32bit
computer and a 64bit one? I heard this on the what's new pordcast of jaws 11
and I looked on the internet but I didn't understand what it ment. Is it
something to do with memory or something? A plain simple expermation will be
greatful! However I don't mind if some of you want to get a little
technical. Just give me the simple basic differences before launching into
technical details about the two different numbers!
Many Thanks
Daniel
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