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Computer architecture with addressable bytes
Byte addressing in hardware architectures supports accessing individual bytes. Computers with byte addressing are sometimes called byte machines, in contrast
Byte_addressing
Order of bytes in a computer word
storage cells (smallest addressable units); in machines that support byte addressing, those units are called bytes. Each byte is identified and accessed
Endianness
Computer memory accessed in word units
word addressing means that addresses of memory on a computer uniquely identify words of memory. It is usually used in contrast with byte addressing, where
Word_addressing
Instruction encoding rule for the x86 instruction set
[SCALE*INDEX+disp32] addressing mode. The SIB byte is an optional post-opcode byte in x86 assembly on the i386 and later, used for complex addressing. If present
ModR/M
Reference to a specific memory location
word addresses, giving an address space of 218 36-bit words, approximately 1 megabyte of storage), not byte addressing. The range of addressing of memory
Memory_address
Unit of digital information, usually 8 bits
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single
Byte
Industrial automation protocol
bit 7, if high use Unique (5 byte) address, else use Polling (1 Byte) addresses. bit 6 and 5, Number of Expansion bytes normally it set if Expansion field
Highway Addressable Remote Transducer Protocol
Highway_Addressable_Remote_Transducer_Protocol
Base memory unit handled by a computer
be advantageous to address to the bit. Machines with bit addressing may have some instructions that use a programmer-defined byte size and other instructions
Word_(computer_architecture)
Serial communication bus
single-byte commands or addresses.) These bytes are used for addressing bytes within the 32 kbit (or 4 kB) EEPROM address space. The same two-byte addressing
I2C
Logical or physical division of storage media
traditionally 512 bytes for hard disk drives (HDDs), and 2048 bytes for CD-ROMs, DVD-ROMs and BD-ROMs. Newer HDDs and SSDs use 4096 byte (4 KiB) sectors
Disk_sector
Aspect of the instruction set architecture of CPUs
Addressing modes are an aspect of the instruction set architecture in most central processing unit (CPU) designs. Addressing modes define how the machine
Addressing_mode
Numeric value with an unclear meaning
that processors without byte addressing will fault when attempting to use them as pointers (which must fall at even addresses). Values should be chosen
Magic_number_(programming)
Computer operation which manipulates invidual bits of data
(usually 8) of the smallest addressable unit, frequently called byte, the shift operations induce an addressing scheme from the bytes to the bits. Thereby the
Bitwise_operation
IBM computer family (1964–1977)
systems use microcode to implement the instruction set, which used 8-bit byte addressing with fixed-point binary, fixed-point decimal and hexadecimal floating-point
IBM_System/360
Way in which data is arranged and accessed in computer memory
be aligned if the data is stored in four consecutive bytes and the first byte lies on a 4-byte boundary. Data alignment is the aligning of elements according
Data_structure_alignment
Virtual machine that runs Java programs
The JVM uses references and stack/array indexes to address data; it does not use byte addressing like most physical machines do, so it does not neatly
Java_virtual_machine
Memory page starting at address zero
zero page and non-zero page addresses; this is called zero-page addressing in 6502 terminology (it is called direct addressing in Motorola 6800 terminology;
Zero_page
Computer architecture bit width
CISC variants, use 48-bit byte addresses. The minimal implementation of the x86-64 architecture provides 48-bit byte addressing encoded into 64 bits; future
48-bit_computing
Early microprocessor
and Skips. Short branches are 2-byte instructions, and use 256-byte range, single byte address, page absolute addressing in the range 0 to 255 (hex FF)
RCA_1802
Computer architecture bit width
saving one byte in the instructions accessing that page, and also having 16-bit addressing instructions that take 2 bytes for the address plus 1 for the
8-bit_computing
International car standard
(eight bytes for CAN, 64 bytes for CAN FD, and 2048 bytes for CAN-XL). ISO-TP can be operated with its own addressing as so-called Extended Addressing or
ISO_15765-2
Unit of information
including the basic byte and word sizes, which are powers of 2. For economy, however, the byte size was fixed at the 8 bit maximum, and addressing at the bit level
Bit
Set of ranges of virtual addresses
process has a 4 GiB VAS: each one of the memory addresses (from 0 to 232 − 1) in that space can have a single byte as a value. Initially, none of them have values
Virtual_address_space
Type of random-access memory for computers
backup power source. Volatile memory is faster than non-volatile; it is byte-addressable; and it can be written to arbitrarily, without concerns about wear
NVDIMM
Multiple of the unit byte
cache size, due to the prevalent binary addressing of memory. The binary meaning of the kilobyte for 1024 bytes typically uses the symbol KB, with an uppercase
Kilobyte
IBM disk file programming interface
accessed as if it contained individual records. Addressing within an LDS is by Relative Byte Address (RBA), which allows it to be used by systems such
Virtual_Storage_Access_Method
Multiple of the unit byte
The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix mega is a multiplier of 1000000
Megabyte
Fourth version of the Internet Protocol
different capacity for addressing hosts. In addition to the three classes for addressing hosts, Class D was defined for multicast addressing, and Class E was
IPv4
Computer architecture bit width
65,536, a processor with 16-bit memory addresses can directly access 64 KiB (65,536 bytes) of byte-addressable memory. If a system uses segmentation with
16-bit_computing
Tool to detect memory-related bugs
fd fd fd fd [...] Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap
Code_sanitizer
Family of backward-compatible assembly languages
use a standard "addressing mode byte" often called the MOD-REG-R/M byte. Many 32-bit x86 instructions also have a SIB addressing mode byte that follows the
X86_assembly_language
Computer architecture bit width
in § Hardware. A processor with 128-bit byte addressing could directly address up to 2128 (over 3.40×1038) bytes, which would greatly exceed the total data
128-bit_computing
Instruction set architecture developed by Digital Equipment Corporation
selecting word versus byte addressing). Two groups of six bits specify the source operand addressing mode and the destination operand addressing mode, as defined
PDP-11_architecture
Instruction set designed to be run by a software interpreter
program objects. The name bytecode stems from instruction sets that have one-byte opcodes followed by optional parameters. Intermediate representations such
Bytecode
Unique identifier assigned to network interfaces
same MAC address. The IEEE 802 MAC address originally comes from the Xerox Network Systems Ethernet addressing scheme. This 48-bit address space contains
MAC_address
instructions support 32-bit arithmetic. Only byte-addressable real memory (Central Storage) and Virtual Storage addressing is limited to 31 bits, as is the case
IBM Enterprise Systems Architecture
IBM_Enterprise_Systems_Architecture
Representation of a memory address
item (byte, word, etc.) of main memory, or a register of memory-mapped I/O device. In a computer supporting virtual memory, the term physical address is
Physical_address
File format for conveying binary information
Start code Byte count Address Record type Data Checksum A record's checksum byte is the two's complement of the least significant byte (LSB) of
Intel_HEX
Maximum amount of RAM accessible by a computer
16-bit addressing. The memory on these CPUs is addressable at the byte level. This leads to a memory addressable limit of 216 × 1 byte = 65,536 bytes or 64
RAM_limit
Label to identify a network interface of a computer or other network node
primary addressing and routing methodologies common in networking: unicast addressing, anycast addressing, and multicast addressing. A unicast address identifies
IPv6_address
Serial communications protocol
code (1 byte), high byte of the register address to read (1 byte), low byte of the register address to read (1 byte) and data (2 bytes = high byte and low
Modbus
Signal in the system bus of an x86-based computer system
its physical address space. For example, a processor with 4 GB of byte-addressable physical space requires 32 lines (log2(4 GB) = log2(232 B) = 32), which
A20_line
Algorithm for encoding data bytes
Consistent Overhead Byte Stuffing (COBS) is an algorithm for encoding data bytes that results in efficient, reliable, unambiguous packet framing regardless
Consistent Overhead Byte Stuffing
Consistent_Overhead_Byte_Stuffing
Computer architecture bit width
addressing. In the mid-1980s, Intel i860 development began culminating in a 1989 release; the i860 had 32-bit integer registers and 32-bit addressing
64-bit_computing
Memory segmentation on Intel x86
processors, which initially could only address 16 KB, or later 64 KB of memory (16,384 bytes or 65,536 bytes, respectively), and whose instructions and
X86_memory_segmentation
BIOS interrupt call for disk access
13h and other interrupts. Typically, UEFI drivers use LBA-addressing instead of CHS-addressing. Under real mode operating systems, such as DOS, calling
INT_13H
Instruction set architecture extension for microprocessors
additional space for encoding 64-bit addressing modes and additional registers present in the x86-64 architecture. The one-byte REX prefix can be added to new
REX_prefix
Computer bus
of addresses used by the I/O devices. Byte addressing means that the physical address passed on the Unibus is interpreted as the address of a byte-sized
Q-Bus
Series of 16-bit computers by Texas Instruments
hardware registers. Addresses are 16-bit byte addresses, so the address space is 216 bytes (65,536 bytes or 32,768 words) large. The byte ordering in words
TI-990
Internet protocol that uses a proxy server
bits Destination port number, in network byte order. DESTIP: 32 bits Destination IPv4 address, in network byte order. ID: variable The User ID string,
SOCKS
Family of instruction set architectures
architectures. Byte-addressing is enabled and words are stored in memory with little-endian byte order. Memory access to unaligned addresses is allowed for
X86
36-bit computer by Digital (1966–1983)
multi-section extended addressing in the KL-10; extended addressing, which changes the process of generating the effective address of an instruction, is
PDP-10
Instruction set architecture extension for microprocessors
processor. The EVEX scheme is a 4-byte extension to the VEX scheme which supports the AVX-512 instruction set and allows addressing new 512-bit ZMM registers
EVEX_prefix
Communication aspects of Universal Serial Bus
device to send. Token packets consist of a PID byte followed by two payload bytes: 11 bits of address and a five-bit CRC. Tokens are only sent by the
USB_communications
Codes used for on-board diagnostics
on the communication type and addressing details. Each trouble code requires 2 bytes to describe. Encoded in these bytes are a category and a number. It
OBD-II_PIDs
Computer architecture bit width
System/360, IBM System/370 (which had 24-bit addressing), System/370-XA, ESA/370, and ESA/390 (which had 31-bit addressing), the DEC VAX, the NS320xx, the Motorola
32-bit_computing
File format for executables, object code, shared libraries, and core dumps
idea from Spice Lisp.[citation needed] All multi-byte values in all data structures are written in the byte order of the host for which the code was produced
Mach-O
First sector of partitioned PC computer disk
parts, and not on byte boundaries. Due to the limits of CHS addressing, a transition was made to using LBA, or logical block addressing. Both the partition
Master_boot_record
Large computer systems produced by IBM since 1952
machine also had a larger address space than the older mainframes, 24 bits addressing 8-bit bytes vs. a typical 18 bits addressing 36-bit words. The smaller
IBM_mainframe
Internet protocol used for error messages in network operations
"Cisco IOS IP Command Reference, Volume 1 of 4: Addressing and Services, Release 12.3 - IP Addressing and Services Commands: ip mask-reply through ip
Internet Control Message Protocol
Internet_Control_Message_Protocol
Operations transforming individual bits of integral data types
individual bits, byte-level operators perform on strings of eight bits (known as bytes) at a time. The reason for this is that a byte is normally the smallest
Bitwise_operations_in_C
Array data structure that compactly stores bits
sequential and the array is relatively small, a byte array may be preferable on a machine with byte addressing. A word array, however, is probably not justified
Bit_array
Type of computer fault
CPUs are byte-addressable, where each unique memory address refers to an 8-bit byte. Most CPUs can access individual bytes from each memory address, but they
Bus_error
Object which stores memory addresses in a computer program
disadvantages. A two-byte offset, containing a 16-bit, unsigned integer, can be used to provide relative addressing for up to 64 KiB (216 bytes) of a data structure
Pointer (computer programming)
Pointer_(computer_programming)
Method of encoding characters in a URI
into 8-bit bytes and percent-encode each byte in the same manner as above. Byte value 0x0F, for example, should be represented by %0F, but byte value 0x41
Percent-encoding
Networking protocol
Support of several addressing modes. In addition to the 6-byte MAC address (including multicast and unicast), it supports a MAC address-less mode, and an
Generic_Stream_Encapsulation
Compiler optimization
subscript i * n + j 0200 r9 = r8 + r3 0210 r10 = r9 * #8 ; calculate byte address 0220 fr3 = #0.0 0230 fstore fr3, A[r10] 0240 0250 r3 = r3 + #1 ; j++
Strength_reduction
Way to specify the location of data on computer storage devices
the address is typically 32 or 64 bits. Most hard disk drives released after 1996 implement logical block addressing. In logical block addressing, only
Logical_block_addressing
Computer architecture bit width
integer word size of 24 bits. Byte addressing is not supported directly but bytes are handled by instructions that pack three bytes per word. The IV/70 CPU
24-bit_computing
spare) is 233400000 bytes." DEC PDP-11 (a binary-addressed machine) Handbook "PDP-11 addressing modes include ... and direct addressing to 32K words" (Page
Timeline_of_binary_prefixes
Unit of digital information
consists of eight bits. The term is often used when the term byte might be ambiguous, as the term byte has historically been used for storage units of a variety
Octet_(computing)
Series of third-generation computers
word address. The word address from the instruction has two zero bits appended to it to calculate a byte address. For instructions that refer to bytes, bits
SDS_Sigma_series
Data storage technologies that use magnetic tape
System/360, and the resultant standardization on 8-bit character codes and byte addressing, 9-track tapes were very widely used throughout the computer industry
Magnetic-tape_data_storage
Microprocessor produced by Western Digital
segmentation in 256 byte increments. Most instructions allocate six bits to specify each operand. Three bits select one of eight addressing modes and three
WD16
Instruction set architecture extension for microprocessors
with a memory operand almost always use the ModR/M byte which specifies the addressing mode. This byte has three bit fields: mod, bits [7:6] - combined
VEX_prefix
Open-source file system
accelerated) file system is an open-source, log-structured file system for byte-addressable persistent memory (for example non-volatile dual in-line memory module
NOVA_(filesystem)
File format developed by Motorola
below. Byte count - two hex digits ("00" to "FF"), indicating the number of bytes (hex digit pairs) that follow in the rest of the record (address + data
Motorola_S-record
8-bit microprocessor
16-bit (64 KB) memory addressing and 8-bit (256 ports) I/O-addressing. All I/O instructions actually assert the entire 16-bit address bus. OUT (C),reg and
Zilog_Z80
Datum of integral data type
stored in memory using a single bit, but is often given a full byte for convenience of addressing and speed of access. A four-bit quantity is known as a nibble
Integer_(computer_science)
Model independent architecture for the S/360 line of mainframe computers
(PSW), which includes a 24-bit instruction address 24-bit (16 MB) byte-addressable memory space Big-endian byte/word order A standard instruction set, including
IBM_System/360_architecture
Educational hypothetical computer
consists of 8-bit bytes, and all memory addresses in SIC are byte addresses. Any three consecutive bytes form a 24-bit 'word' value, addressed by the location
Simplified Instructional Computer
Simplified_Instructional_Computer
8-bit microcontroller product lines from STMicroelectronics
index registers (X and Y) used for memory addressing. Also both have 8-bit instructions followed by up to 2 bytes of operands, and both have support for
ST6_and_ST7
Endianness only applies to processors that allow individual addressing of units of data (such as bytes) that are smaller than some of the data formats. In some
Comparison of instruction set architectures
Comparison_of_instruction_set_architectures
Spacecraft communications network
more address bytes are used for the routing. Addresses are either physical ones (0–31), or logical ones. The difference is that the physical addresses are
SpaceWire
General Electric mainframe computers
addressing modes, many of which use indirect words, some of which are auto-incrementing or auto-decrementing. Multiple levels of indirect addressing are
GE-600_series
including the basic byte and word sizes, which are powers of 2. For economy, however, the byte size was fixed at the 8 bit maximum, and addressing at the bit level
List of computer term etymologies
List_of_computer_term_etymologies
Computer science concept
requirements are usually met by using NOR flash memory or EEPROM, which can be byte-addressed for read operations, although it is a bit slower than normal system
Execute_in_place
8-bit microprocessor from 1975
(possibly) multiple addressing modes. Depending on the instruction and addressing mode, the opcode may require zero, one or two additional bytes for operands
MOS_Technology_6502
Internal representation of numeric values in a digital computer
calculators. Numerical values are stored as groupings of bits, such as bytes and words. The encoding between numerical values and bit patterns is chosen
Computer_number_format
Microprocessor instruction set
Intel 8080. Intel 8080 instructions are one to three bytes long whereas the Z80 requires up to four bytes per instruction. Zilog continued to expand the instruction
Z80_instruction_set
Class of computer memory address reference
pointer.[unreliable source?] Most architectures are byte-addressable (the smallest addressable unit is a byte), but certain types of data will often be aligned
Tagged_pointer
Data interface description language
and not direct byte addressing (but the same remark would be true with modern processors and memory/storage units whose minimum addressable unit is larger
ASN.1
Discontinued computer memory type
2019, with low write latency. As the memory was inherently fast and byte-addressable, techniques such as read-modify-write and caching used to enhance traditional
3D_XPoint
Memory management feature
allowing these CPUs to directly access a physical address space larger than 4 gigabytes (232 bytes). The page table structure used by x86-64 CPUs when
Physical_Address_Extension
8-bit microprocessor
memory byte addressed by the 16-bit register pair HL. Increments and decrements can be performed on any 8 bit register or an HL-addressed memory byte. Direct
Intel_8080
Operating system
distinctive 3-way branch operation. Since Prime's hardware did not perform byte addressing, there was no impetus to create a C compiler. Late models of the hardware
PRIMOS
Personal computer by Commodore
Supported by these drives are double-sided disks with a capacity of 901,120 bytes, as well as 360- and 720-KB disks formatted for IBM PC compatibles. The
Amiga_500
24-bit number in networking equipment that uniquely identifies its manufacturer
least-significant-bit of each byte first in serial data communications. "The format of a MAC data frame in which the octets of MAC addresses conveyed in the MAC
Organizationally unique identifier
Organizationally_unique_identifier
Open standard processor interconnection for data centers
Devices provide host CPU with low-latency access to local DRAM or byte-addressable non-volatile storage. Type 2 devices implement two memory coherence
Compute_Express_Link
Security for the Java platform and its applications
scale factor for addressing elements in the storage allocation of a given array class. static int addressSize(): obtains the size (in bytes) of a native pointer
Security of the Java software platform
Security_of_the_Java_software_platform
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BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
BYTE ADDRESSING
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