BX
– This is the base register. It is of 16 bits and is divided into two 8-bit registers BH and BL to also perform 8-bit instructions. It is used to store the value of the offset. CX – This is the counter register.
Which register is used to hold the offset address for data segment?
Stack pointer (SP)
holds the offset address of the stack segment. 4. Base pointer (BP) can be used general register and also used to hold offset address in few instructions.
Which of the following registers can be used as offset registers for data segment?
Explanation:
The register SI
is generally used to store the offset of source data in the data segment while the register DI is used to store the offset of destination in data or extra segment.
What is offset register?
In computer engineering and low-level programming (such as assembly language), an offset usually
denotes the number of address locations added to a base address in order to get to a specific absolute address
.
What is segment offset?
A Segment Offset Address
combines the starting address of a segment with an offset value
. Segment and offset: … The offset address is always added to the segment starting address to locate the data. All real mode memory addresses must consist of a segment address plus an offset address.
What is the use of base register and offset register?
The base address register is a pointer to a byte in memory, and the
offset specifies a number of bytes
. Immediate means the address is calculated using the base address register and a 12-bit offset encoded in the instruction.
Which of the following is System segment register?
Which of the following is a system segment register? Explanation: The
LDTR and TR
are known as system segment registers. Explanation: Two test registers are provided by 80386 for page caching, namely test control and test status registers.
What is an effective address or offset?
Effective Address or Offset Address:
The offset for a memory operand is called the operand’s effective address or EA. It is
an unassigned 16 bit number that expresses the operand’s distance in bytes from the beginning of the segment
in which it resides. In 8086 we have base registers and index registers.
How is offset address calculated?
- this is the distance from the beginning of the page.
- e.g. address in the process, A = 10,000.
- page size = 4k.
- page offset = 10000 mod 4k = 10,000 mod 4096 = 1908.
- this calculation is done quickly on the computer since the page size is power of 2, e.g., 4k = 2^12.
What is the function of segment registers?
A segment register
changes the memory address accessed by 16 bits at a time
, because its value is shifted left by 4 bits (or multiplied by 16) to cover the entire 20-bit address space. The segment register value is added to the addressing register’s 16-bit value to produce the actual 20-bit memory address.
Which one is the default offset register to code segment?
It is basically
CS register<<4 + offset
. The Segment Selector maps to the GDT or LDT as given in the TI bit of the segment selector. GDT consists of Segment Descriptors which have BASE , LIMIT and RPL and the output is base address. This base address + offset provides the logical address .
What is an offset in MIPS?
The MIPS instruction that loads a word into a register is the lw instruction. … The offset is
a 16-bit signed integer contained in the instruction
. The sum of the address in the base register with the (sign-extended) offset forms the memory address.
What is an offset in a graph?
Offsets
provide a mechanism to put a boundary around the data inside of an autoscaled graph
. … A positive offset expands the graph in the specified direction, e.g., a positive bottom offset makes ymin more negative. Negative offsets, while permitted, can have unexpected interactions with autoscaling and clipping.
What is the purpose of setting the segment offset?
So, instead of dealing with whatever problems a linear addressing scheme of 32-bits would have produced, they created the Segment:Offset scheme which
allows a CPU to effectively address about 1 MiB of memory.
What is the offset value?
Specify offset values if your coordinate data includes negative numbers or measures. An offset is
a number that is subtracted from all coordinates
, leaving only positive values as a remainder.
What is the offset in memory?
The offset is
the second part of a logical address that permits to locate an Address inside a memory segment
. A offset is not an address but the (distance|id) of this Address from the start of a memory segment starting at 0 . An offset is also known as: an effective address. an address offset.
