Copy Buffer1 to Buffer2 in Intel 586 ASM: Beginner's Guide

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To copy string contents from one buffer to another in assembly language on an Intel 586 architecture without using string functions, one can utilize basic instructions like MOV to transfer data byte by byte. The discussion highlights the importance of understanding the difference between real mode and protected mode in assembly programming. Real mode operates with a memory limit of 1MB, while protected mode allows access to a larger memory space, up to 4GB. This distinction is noted as a factor in the differences observed between DOS in Windows XP and Windows 95, as the latter primarily operated in real mode, impacting memory management and functionality.
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In assembly language (on at least an Intel 586 arch) how would I copy the string contents of one buffer to another without using any string functions for copying? I want to copy the contents from buffer1 to buffer2. I'm just beginning to learn how to code in assembly language, so I'm completely lost!
 
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Are you doing real or protected mode assembly?
 
I was wondering, is it the real mode and protected mode difference that makes the current DOS in windows XP seem different to the DOS in windows 95? I know that real mode is limited to 1mb and protected is something like 4gb.
 
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