Skip to main content

MAC



Two MAC are declared below :-
1.   A MAC is an address of a device which stands for media access control address. It is a uniquely identified address assigned to a network interface controller (NIC) for communications at the data link layer of a network segment. MAC addresses are used as a network address by many IEEE 802 network technologies, including Ethernet, Wi-Fi and Bluetooth. A network node may have multiple NICs where each NIC contains a unique MAC address. They are used in the medium access control protocol sublayer.
MAC addresses are represented as six groups of two hexadecimal digits, separated by hyphens, colons, or no separator.
A MAC address is also known as burned-in address (BIA), Ethernet hardware address (EHA), hardware address or physical address.
MAC addresses are assigned by the manufacturer of a NIC and are stored in its hardware, like ROM or some other firmware mechanism. A manufacturer's organizationally unique identifier (OUI) may be contained in MAC address.
The US National Security Agency has a system to track the movements of everyone in the city by monitoring the MAC addresses of their electronic devices. By knowing that the users being trackable by their devices' MAC addresses, Apple has started using random MAC addresses in their iOS line of devices while scanning for networks. Many vendors quickly followed MAC address randomization for scanning by adding in Android version 6.0, Windows 10, and Linux kernel 3.18.

2.   The Macintosh branded as Mac since 1998 is a family of personal computers designed, manufactured, and sold by Apple Inc. since January 1984. The original Macintosh was the first mass-market personal computer that featured a GUI, built-in screen and mouse. Macintosh systems still found success in education, desktop publishing. It kept Apple as the second-largest PC manufacturer for the next decade.
Mac
Apple has developed a series of Macintosh operating systems. They are :- 
a)  Mac OS 7.6 in 1997  
b)  Mac OS X (UNIX Based OS) in 2001       
c)  Mac OS in 2016
d)  macOS Mojave in 2018
 Apple does not license mac OS for use on non-Apple computers but Only one company, UMAX Technologies was legally licensed to ship clones running Mac OS 8.



Labels:

Comments

Post a Comment

Popular posts from this blog

Atanasoff - Berry Computer ( ABC )

The Atanasoff – Berry Computer (ABC)   was the first electronic computer, designed and built by Lowa State College Mathematics and Physics professor John Vincent Atanasoff and his assistant, Clifford E. Berry ( a graduate student) . They worked in the basement of the physics building at Lowa State College on the computer from 1939 until 1942 when it was abandoned due to World War II . Unfortunately, after being abandoned , it was neglected and eventually disassembled for parts. In 1994, a team from Lowa state University began to rebuild the computer, finishing it in 1997. The system weighed more than seven hundred pounds (320 kg). It contained approximately 1-mile (1.6 km) of wire, 280 dual-triode vacuum tubes, 31  thyratrons , and was about the size of a desk.  The idea behind the ABC were later used in the construction of the ENIAC, the world’s first general purpose computer. Purpose / Working ABC was designed only to solve systems of  l...
Post a Comment
Read more

Integrated Injection Logic (I2L)

Integrated Injection Logic (I2L) was disclosed in 1972 at International Solid State Circuits Conference by C. M. Hart and A. Slob of Philips, The Netherlands, and by H. H. Berger and S. K. Wiedmann of IBM, West Germany simultaneously. The basic logic unit is a multiple output inverter which is physically realized as a conventional npn multi-emitter transistor operated in the inverse mode. Base drive to the npn inverters is supplied by multicollector lateral pnp current source transistors. The emitter of the pnp transistor is referred to as the injector, and a single injector distributes base drive to many npn logic units. The outputs of I2L units may be " wire AND " with outputs from other units for NAND implementation of logic functions. I2L is a bipolar LSI circuit technique which achieves high packing density and good power-delay efficiency using conventional bipolar processing. It uses the properties of ion implantation to achieve improved performance ca...
Post a Comment
Read more

Nagware

Nagware is a software utility that adds users into upgrading or buying a premium version of software by sending constant pop-up messages or notifications.   It is a marketing tactic used by software developers in order to remind users to take advantage of special offers and purchase software. Nagware is also known as begware , annoyware , nagscreen and guiltware . It is built into commercial software that periodically prompts the user to register the product. Nagware is commonly used with  shareware  programs which have been downloaded for trial use. It keeps the message up for a certain time period, forcing the user to continue using the program. 
Post a Comment
Read more