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4
questions
4
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4
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The move to protected mode on x86 [closed]
When I learned programming, the programmer of the CPU had direct memory access. That is, the Z80, the 8086/8088, 6502, and so on. I don't know of any real use of the 186, but at least the 286 ...
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24
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4
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How can a 32-bit x86 CPU start with reset vector 0xFFFFFFF0 even though it starts in 16-bit real mode?
As far as I know, x86 CPUs start up in 16-bit 'real' mode (maybe some don't).
The reset vector is 0xFFFFFFF0 (in most CPUs and in this context)
In this 16-bit real mode, we can only access 16 bit ...
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13
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2
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Are .COM executable binaries real mode or protected mode?
Windows and DOS binary executable files with the .EXE extension have an MZ header in them and nowadays also a PE header.
But before these there used to also be .COM binary executable files and they ...
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9
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How does the ‘real mode flat model’ work?
I am interested in old Intel processors. I'll try to be as concise as possible.
I have been studying both Jeff Duntemann's Assembly Language Step-by-Step - Chapter 4 and Modes of Memory Addressing on ...
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