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From: NL0GRO@NL3CUY.NBO.NLD.EU
To  : 32BIT@NLD




Hoiii..

Hieronder een stukje uitleg over 32bit. Ik vond het toevallig in een docwerk,
misschien dat sommigen onder ons het wel intresant vinden..


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     [* What is 32-bit? *]

     When DOS was written, the computers of the day were 16-bit Intel
     8088 based computers. These computers became very popular and a
     great deal of software was being developed for them.
     These software packages were also 16-bit, and because of this, they
     could only access 640KB of memory (also known as Conventional Memory).

     As time went on, Intel started coming out with more advanced and
     faster processors. Intel knew that it must keep backward compatibility
     with the previous generations of microprocessors. If not, all the
     software already written could not be used with the new processors.
     So, when they developed the 80386 32-bit processor, it was designed to
     also operate in 16-bit real mode for compatibility. The 386 also had
     the ability to run in 32-bit protected mode. Intel continued
     increasing the speed with the 80486 and then the Pentium line of
     processors. All these processors are 32-bit that can also operate in
     16-bit real mode the keep compatibility.

     Today, DOS is still extremely popular and so are many of the 16-bit
     programs written for it even though a majority of the people are using
     32-bit processors. There are 32-bit operating systems such as OS/2 and
     Windows NT, but DOS is still popular nonetheless.

     Now, there is something called DOS Extenders. If a DOS program is
     written with a DOS Extender, the program will run in 32-bit protected
     mode under DOS. When you run a DOS Extended program, the program
     places the processor in protected mode and executes all instructions
     in protected mode. It returns to real mode only when it needs to
     interface with real mode code such as DOS or hardware interrupt
     handlers. The end result is a program that runs faster, has code that
     is smaller, and has access to what is known as a linear address space.
     A linear address space means the program can access up to 4GB
     (gigabytes) of RAM automatically! In protected mode, the 640KB barrier
     does not exist. Essentially, you are operating in a 32-bit DOS.
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Mazzel,
ReMoN.