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Which segment is used to store interrupt and subroutine return address registers?
Wiki User
∙ 9y ago
stack segment
Wiki User
∙ 9y ago
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Give the segment registers and their corresponding offset registers?
Give the effective address if the segment register is AA03 and the offset register is 0200.
Which program segment at run time is used to store interrupt and subroutine return addresses?
If this is a homework assignment, you really should try to answer it on your own first, otherwise the value of the reinforcement of the lesson due to actually doing the assignment will be lost on you.Interrupt and subroutine return addresses are stored on the stack, so the stack segment is used for interupt and subroutine addresses.
How does an 8088 microprocessor generate physical address?
8086 has memory divided into segments.Each segment has its particular register like ES, DS, SS, CD (extra segment, data segment, stack segment and code segment).These registers hold the base address BA.Now, there two base registers(BX and BP) and two index registers(SI and DI) in 8086. These registers hols the effective address EA.Now Physical address PA is sum of EA and BA.That is,PA = BA+EA
How are segment registers used to form a 20-bit address?
The 16 bit segment register is left shifted by 4 and added to the effective address to form a 20 bit physical address.
How many base registers are there in 8086?
There are four base registers in the 8086/8088; Code Segment (CS), Data Segment (DS), Stack Segment (SS), and Extra Segment (ES).
What are segment registers?
In the x86 processor architecture, memory addresses are specified in two parts called the segment and the offset. One usually thinks of the segment as specifying the beginning of a block of memory allocated by the system and the offset as an index into it. Segment values are stored in the segment registers. There are four or more segment registers: CS contains the segment of the current instruction (IP is the offset), SS contains the stack segment (SP is the offset), DS is the segment used by default for most data operations, ES (and, in more recent processors, FS and GS) is an extra segment register. Most memory operations accept a segment override prefix that allows use of a segment register other than the default one.
How many register are located in 8088microprocessor?
there are 14 registers in 8088 micro processor. All the 14 are 16 bit registers. They are4 segment registers viz - code segment register, stack segment register, data segment register, extra segment register.general registers are - accumulator register i.e. AX, base register i.e. BX, count register i.e. CX, data register i.e. DX and stack pointer (SP), base pointer (BP).index registers are - source index(SI), destination index(DI),and the other registers are instruction pointer and flags register.
Explain about segment registers in 8086MP?
There are four segment registers in the 8086/8088 processor, CS, DS, ES, and SS, also known as Code Segment, Data Segment, Extra Segment, and Stack Segment. Any time an address is generated by the processor, it is added to the value of one of the segment registers, after that segment register is effectively multiplied by 16, or left shifted four bits, in order to generate the physical address that accesses memory. This gives an effective address range of 20 bits, or 1mb, but note that only 64kb is addressable through any segment register at one time, unless you stop to change the contents of that segment register. This is known as a segmented architecture. By default, the CS register is used when fetching instructions, the DS register is used when accessing data, the SS register is used when accessing the stack, and the ES register is used during certain string type instructions. If desired, an instruction prefix can be used to override, such as forcing use of CS instead of DS when using a table contained within opcode space.
Why was segmentation originally introduced in 8088 architecture?
Memory segmentation is an attempt to address more memory than the processor architecture would normally allow.In the case of the 8086/8088, a 16 bit processor, you would normally expect addressibility of 64 kb, because that is what the instruction set is capable of developing as an effective address, either in the case of a direct address, an indirect address, or an indexed address, since all of its registers are 16 bits in size.What Intel did was provide four more registers called segment registers which would provide the base address of an address in physical memory to which the processor generated effective address would be added. The segment register is still 16 bits in size, but it is left shifted by four before being added to the effective address. This creates a physical address that is 20 bits in size, for a total address range of 1 mb.Note that you are still constrained to a segment size of 64 kb, in that you must stay within 64 kb unless you intend to change the value of one of the segment registers. This hampers the ability to access any arbitrary location in memory, effectively making it a two step operation - load the segment register - then access the offset address.In the 8086/8088 there are four segment registers; Code Segment (CS), Data Segment (DS), Stack Segment (SS), and Extra Segment (ES). All opcode access is from CS. Default data access is from DS, unless a segment prefix is applied. All stack operations are from SS. Certain repeated string operations take place between DS and ES.Because of the segmented architecture, the concept of near and far grew up with the original PC and DOS and Windows. Basically, a near address was a 16 bit address that assumed the current segment, while a far address was a 32 bit address that contained both a segment and an offset. Note that the concept of a flat 32 bit address did not come into full play until true 32 bit operating systems hit the street, and that did not occur until the introduction of the 80386.
What are the function of segment register?
The segment register in the 8086/8088 provide a base address for any memory access. There are four segment registers, CS - Code Segment, DS - Data Segment, SS - Stack Segment, and ES - Extra Segment. Each in used in the context of a particular instruction and contains the base address of the memory segment divided by 16. This allows the processor to access up to 1 MB of memory, though only in segments of 64 KB at a time.
What is the BP pointing registers default memory segment?
SS
What is the example of segment register?
There are four segment registers on the 8086 and 8088. These are CS (code for code), DS (data segment), ES (extra data segment), and SS (stack segment).
