Computer Fundamentals - 4

The location where input/output devices are connected to the computer is known as port.

SCSI (Small Computer System Interface) is a set of standards for physically connecting and transferring data between computers and peripheral devices, historically supporting multiple devices on a single bus.

The light pen was developed by Ben Gurley at MIT in 1950 as part of the Whirlwind project.

A hard disk drive is a data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks coated with magnetic material.

Memory-resident packages (or terminate-and-stay-resident programs) reside in the computer's memory to provide immediate access to utilities like calendars or calculators while other programs are running.

A memory cell is the fundamental building block of computer memory, capable of storing one bit of information.

The ILLIAC series (e.g., ILLIAC IV) were pioneering supercomputers developed at the University of Illinois.

Symbolic code, or assembly language, uses mnemonics (English-like abbreviations) to represent machine code instructions.

Core memory was the primary form of random-access computer memory in the mid-20th century, consisting of small magnetic rings (cores) used to store data.

William Oughtred is credited with inventing the slide rule in the 17th century, based on the logarithmic work of John Napier. Babbage is known for the Analytical Engine, Pascal for the mechanical calculator, and Napier for logarithms.

A stack operates on the Last-In, First-Out (LIFO) principle, where the last item added is the first one removed. Buffers are generally First-In, First-Out (FIFO) structures.

An opcode (operation code) is the portion of a machine language instruction that specifies the operation to be performed by the CPU. The address field specifies the data or location to be operated on.

In communications and networking, a channel is the physical or logical medium used to transmit signals from a source to a destination. While routes and links are related, channel is the standard term for the signal path.

Magnetic core memory was an early form of random-access memory that used small ferrite rings, or cores, to store binary data through magnetization states.

A full adder circuit takes three inputs: two bits to be added (A and B) and a carry-in bit (Cin). It produces two outputs: a sum and a carry-out.

Bandwidth refers to the range of frequencies within a given band that can be used for data transmission. It is a measure of the capacity of a communication channel.

The Program Counter (PC) or Instruction Pointer is the register that holds the address of the next instruction to be executed; in many contexts, this is referred to as an Address Register.

FORTH was developed by Charles H. Moore in the late 1960s while he was working at the National Radio Astronomy Observatory.

The S-100 bus, introduced with the Altair 8800, is a standard interface that uses 100 parallel lines for communication between the CPU and peripheral cards.

A paging drum is a dedicated high-speed storage device used in early virtual memory systems to hold pages of memory that were swapped out from RAM.

An operation code (opcode) is the portion of a machine instruction that specifies the operation to be performed; it is sometimes referred to as an order code.

A page table is a data structure used by a virtual memory system in a computer operating system to store the mapping between virtual addresses and physical addresses.

Run time is the period during which a computer program is executing. It contrasts with compile time or load time.

Euronet was an early packet-switched network established in Europe during the 1970s. The other options (Ring, LAN, Star) describe network topologies or types, not specific packet-switching networks.

Data integrity refers to the maintenance and assurance of data accuracy and consistency over its entire life cycle, including protection against system errors or unauthorized changes.

Cross coupling is the technique of connecting the output of one logic gate to the input of another to create a feedback loop, which is the fundamental mechanism behind a flip-flop.

An archive file is a file that has been moved to long-term or lower-level storage because it is not currently needed for active processing.

In computing, a mask is a bit pattern used to select, clear, or set specific bits in a byte or word, effectively controlling the form or value of another number.

A Database Management System (DMS or DBMS) is software designed to define, manipulate, retrieve, and manage data in a database.

The control unit is often referred to as the 'nerve center' or 'master dispatcher' of the CPU because it coordinates the activities of all other components.

Magnetic bubble memory was a type of non-volatile computer memory that used a thin magnetic film to hold bits of data as small magnetized areas, developed in the late 1960s.

A touch pad is an input device that uses a pressure-sensitive surface (often with switch contacts) to detect touch and translate it into coordinate movements.

Howard Aiken, in collaboration with IBM, developed the Harvard Mark I, which was the first large-scale automatic digital computer to use electromechanical relays. Konrad Zuse's Z3 was also a relay computer, but Aiken's machine is historically cited in this context.

Encoding is the process of converting data or a message into a specific format or code for transmission or storage. Encryption is a specific type of encoding intended for security, while decoding is the reverse process.

Videotext (or Videotex) refers to systems that provide interactive information services, typically displaying text and simple graphics on a screen, often via telephone lines or broadcast signals.

Distributed logic refers to a system architecture where processing power and logic are spread across multiple components or nodes rather than being centralized in a single processor.

Functional languages, such as Lisp or Haskell, are often referred to as application languages because they are designed to solve problems by evaluating functions rather than executing a sequence of imperative commands.

Konrad Zuse's Z1 and Z2 were early computers built using mechanical components, specifically electromechanical relays and levers, before the move to fully electronic vacuum tube systems.

A latch is a basic electronic circuit element that can store a single bit of data temporarily, serving as the fundamental building block for memory cells.

Punched cards were used for data storage and input in early computing systems long before magnetic storage media like tapes or disks became standard.

A flag is a bit or a set of bits used to store a status or indicate a condition about a piece of data or a process, such as a zero flag or carry flag in a CPU.

Expanded memory (EMS) was a technique in DOS-based systems to access memory beyond the 640KB conventional limit by swapping pages into a small window, requiring specific software support.

Cache memory is a high-speed storage layer that holds frequently accessed data so that future requests for that data can be served faster than accessing the main memory.

Voice response unit is a device which uses words or messages recorded on a magnetic medium to produce audio response.