Civil Rights
Movements, leaders, victories and the continuing fight for equality.
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Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
Katherine Johnson’s mathematical calculations helped guide some of America’s most important early space missions while she confronted the racial and gender barriers faced by Black women in twentieth-century America.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
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External Data Representation (XDR) is a technical standard format for data serialization, for uses such as computer network protocols. It allows data to be transferred between different kinds of computer systems. Converting from the local representation to XDR is called encoding. Converting from XDR to the local representation is called decoding. XDR is implemented as a software library of functions which is portable between different operating systems and is also independent of the transport layer.
XDR uses a base unit of 4 bytes, 32 bits, serialized in big-endian order; smaller data types still occupy four bytes each after encoding. Variable-length types such as string and opaque are padded to a total divisible by four bytes. Floating-point numbers are represented in IEEE 754 format.
XDR was developed in the mid 1980s at Sun Microsystems, and first widely published in 1987.[2] XDR became an Internet Engineering Task Force (IETF) Internet Standard in 1995.
The XDR data format is in use by many systems, including:
The XDR standard exists in three different versions in the following RFCs:
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
External Data Representation (XDR) is a technical standard format for data serialization, for uses such as computer network protocols. It allows data to be transferred between different kinds of computer systems. Converting from the local representation to XDR is called encoding. Converting from XDR to the local representation is called decoding. XDR is implemented as a software library of functions which is portable between different operating systems and is also independent of the transport layer. XDR uses a base unit of 4 bytes, 32 bits, serialized in big-endian order; smaller data types still occupy four bytes each after encoding. Variable-length types such as string and opaque are padded to a total divisible by four bytes. Floating-point numbers are represented in IEEE 754 format.
XDR may refer to: Extreme Dynamic Range, a designation for some computer monitors from Apple, like Pro Display XDR, Super Retina XDR, Liquid Retina XDR, and Ultra Retina XDR XDR (audio), or expanded dynamic range, an audio cassette quality-control and duplication process XDR (video game), for the Sega Mega Drive XDR DRAM, a type of computer memory XDR Schema, a discontinued schema language for XML documents External Data Representation, a standard data serialization format Extensively drug-resistant, a category of multiple drug resistance Extended detection and response, a cyber security technology that monitors and mitigates cyber security threats Xavier de Rosnay (born 1982), a French musician Special drawing rights, a monetary unit of the International Monetary Fund (ISO 4217 code: XDR)
Open Network Computing (ONC) Remote Procedure Call (RPC), commonly known as Sun RPC is a remote procedure call system. ONC was originally developed by Sun Microsystems in the 1980s as part of their Network File System project. ONC is based on calling conventions used in Unix and the C programming language. It serializes data using the External Data Representation (XDR), which has also found some use to encode and decode data in files that are to be accessed on more than one platform. ONC then delivers the XDR payload using either UDP or TCP. Access to RPC services on a machine are provided via a port mapper that listens for queries on a well-known port (number 111) over UDP and TCP. ONC RPC version 2 was first described in RFC 1050 published in April 1988. In June 1988 it was updated by RFC 1057. Later it was updated by RFC 1831, published in August 1995. RFC 5531, published in May 2009, is the current version. All these documents describe only version 2 and version 1 was not covered by any RFC document. Authentication mechanisms used by ONC RPC are described in RFC 2695, RFC 2203, and RFC 2623. Implementations of ONC RPC exist in most Unix-like systems. Microsoft supplied an implementation for Windows in their (now discontinued) Microsoft Windows Services for UNIX product; in addition, a number of third-party implementation of ONC RPC for Windows exist, including versions for C/C++, Java, and .NET (see external links). In 2009, Sun relicensed the ONC RPC code under the standard 3-clause BSD license, which was reconfirmed by Oracle Corporation in 2010 following confusion about the scope of the relicensing.
In computer science, a graph is an abstract data type that is meant to implement the undirected graph and directed graph concepts from the field of graph theory within mathematics. A graph data structure consists of a finite (and possibly mutable) set of vertices (also called nodes or points), together with a set of unordered pairs of these vertices for an undirected graph or a set of ordered pairs for a directed graph. These pairs are known as edges (also called links or lines), and for a directed graph are also known as edges but also sometimes arrows or arcs. The vertices may be part of the graph structure, or may be external entities represented by integer indices or references. A graph data structure may also associate to each edge some edge value, such as a symbolic label or a numeric attribute (cost, capacity, length, etc.).
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Madam C.J. Walker
