When stored in contiguous blocks, data usually has a base address. Accessing any data from the block requires an offset to the base address which is achieved through an index. The adding of an offset to the base address is called indexed addressing.
Relative:- 1. In this mode the content of the program counter is added to the address part of the instruction to obtain the effective addressed. 2. Effective Address = Contents of the program counter + contents of address field. 3. No extra index bit is used. 4. Example:- EA = [ BX ] + [ SI ] + disp. EA = [ BX ] + [ DI ] + disp. Indexed:- 1. In this mode of addressing an attempt is made to avoid the use of two addressed for an operand. 2. Effective Address = Address field + contents of the specified - index registers. 3. In this extra index bit is used. 4. Example:- EA = [ BX ] + [ SI ] EA = [ BX ] + [ DI ]
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provides connectionless, unreliable serviceso UDP faster than TCPadds only checksum and process-to-process addressing to IPused for DNS and NFSused when socket is opened in datagram mode
LBA (logical block addressing) is a function of the drive electronics but can also be a weakness i the operating system (Win 3.1 versus Windows XP for example.)
Indexed sequential file organization offers advantages such as fast access to records through the use of an index, which allows for efficient retrieval of data. It also provides sequential access to records, making it suitable for applications that require both sequential and random access. Additionally, indexed sequential files are typically more space-efficient compared to other file organization methods, as they combine the benefits of both sequential and random access structures.
* Direct * Register Indirect * Based Mode * Indexed Mode * Scaled Indexed Mode * Based Indexed mode * Based scaled indexed mode * Based Indexed mode with displacement * Based scaled indexed mode with displacement
zero -Aval Preet Singh
zero -Aval Preet Singh
indexed addressing
Addressing modes of 8051 are 1.Immediate Addressing Mode 2.Register Addressing Mode 3.Register Indirect Addressing Mode 4.Direct Addressing Mode 5.Implied Addressing Mode and 6.Relative Addressing Mode
The advantage of indirect and indexed addressing modes lies in their flexibility and efficiency for accessing data. Indirect addressing allows for dynamic memory access by using a pointer to the memory location, enabling easier management of data structures like arrays and linked lists. Indexed addressing, on the other hand, facilitates accessing elements within data structures by combining a base address with an offset, making it efficient for iterating through arrays and performing calculations with varying data sizes. Together, these addressing modes enhance program versatility and can lead to more efficient memory usage.
literal and absolute direct are the registers
there are five addressing modes in 8086 they are : 1->direct addressing 2->Indirect addressing 3->index addressing 4->immediate addressing 5->register addressing
Data can be accessed from memory by using the addressing modes, 8085 has 5 addressing modes namely,1. Immediate addressing mode 2. register addressing mode 3. direct addressing mode 4. indirect addressing mode 5. implied addressing mode
register direct addressing mode
Indexed addressing uses an index register to modify the address of the operand, allowing for efficient access to arrays or tables by adding an offset to a base address. In contrast, based addressing uses a base register to provide a starting point for address calculation, typically for accessing data structures relative to a fixed memory location. Essentially, indexed addressing focuses on dynamic offsets for array elements, while based addressing relies on a static reference point. Both methods enhance memory access flexibility, but they serve different purposes in addressing schemes.
Direct addressing mode