1. What are program-visible registers?
The register which can be accessed directly by a program
they are called visible registers.
2. What are program-invisible registers?
The program invisible registers are used to access and specify the address tables
of global and local descriptor tables. - Since these types of register cannot be
accessed directly by a program they are called invisible registers.
2. The 80286 addresses registers that are 8 and 16
bits wide.
3. The extended registers are addressable by 80386
microprocessors.
4. The extended BX register is addressed as EBX.
5. ECX register holds a count for some instructions ,
it is general purpose register and in 80386 and above processors can hold
offset address of memory data.
6. What is the purpose of the IP/EIP register?
The EIP register always contains the address of the next instruction to be executed. · You cannot directly access or change the instruction pointer.
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Keywords :-
Barry B. Brey book ,
Barry B. Brey book chapter 2 ,
Barry B. Brey book exercise questions ,
Intel microprocessors ,
8086/8088, 80186/80188, 80286, 80386, 80486, Pentium,
Pentium Pro Processor, Pentium II, Pentium III,
Pentium 4,
and Core2 with 64-Bit Extensions
Architecture, Programming, and Interfacing
THE MICROPROCESSOR AND ITS ARCHITECTURE
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