Computer terminal Wikipedia. The DECVT1. 00, a widely emulated computer terminal. IBM 2. 74. 1 terminal. A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying or printing data from, a computer or a computing system. The teletype was an example of an early day hardcopy terminal,2, and predated the use of a computer screen by decades. Early terminals were inexpensive devices but very slow compared to punched cards or paper tape for input, but as the technology improved and video displays were introduced, terminals pushed these older forms of interaction from the industry. N.249383101.jpg' alt='Visual Typewriter Serial Number' title='Visual Typewriter Serial Number' />A related development was timesharing systems, which evolved in parallel and made up for any inefficiencies of the users typing ability with the ability to support multiple users on the same machine, each at their own terminal. The function of a terminal is confined to display and input of data a device with significant local programmable data processing capability may be called a smart terminal or fat client. A terminal that depends on the host computer for its processing power is called a dumb terminal or thin client. A personal computer can run terminal emulator software that replicates the function of a terminal, sometimes allowing concurrent use of local programs and access to a distant terminal host system. HistoryeditThe terminal of the first working programmable, fully automatic digital 4 Turing complete5 computer, the Z3, had a keyboard and a row of lamps to show results. Hard copy terminalseditEarly user terminals connected to computers were electromechanical teleprintersteletypewriters Tele. TYpewriter, TTY, such as the Teletype Model 3. ASR, originally used for telegraphy or the Friden Flexowriter. Later printing terminals such as the DECwriter LA3. However printing terminals were limited by the speed at which paper could be printed, and for interactive use the paper record was unnecessary. Closeup of an IBM 2. Selectric golfball typing element and was faster than the earlier day teletype machines. By the early 1. 97. The problem was that the amount of memory needed to store the information on a page of text was comparable to the memory in low end minicomputers then in use. Displaying the information at video speeds was also a challenge and the necessary control logic took up a rack worth of pre integrated circuit electronics. One companywho announced plans to build a video terminal for 1. ICs, proved too ambitiouscitation needed. Another approach involved the use of the storage tube, a specialized CRT developed by Tektronix that retained information written on it without the need to refresh. The Datapoint 3. 30. Technology keeps you connected everywhere you go, helps you capture every moment makes your life a bit easier stay uptodate with tips tricks from eHow. Offers news, comment and features about the British arts scene with sections on books, films, music, theatre, art and architecture. Requires free registration. That was one hell of an episode of Game of Thrones. So much fire. And even more ice Lets try to wrap our heads around everything that happenedif youve. Efficient airruining machines. Photo by George FreyGetty Images Its a bad day to breathe in a city. As I write this post, there are air quality alerts in D. C. Computer Terminal Corporation was announced in 1. It solved the memory space issue mentioned above by using a digital shift register design, and using only 7. Visual Typewriter Serial Number' title='Visual Typewriter Serial Number' />Early VDUseditEarly video computer displays were sometimes nicknamed Glass TTYs glass Teletypes or Visual Display Units VDUs, and used individual logic gates, with no CPU or very primitive LSI chips, yet quickly became extremely popular Input Output devices on many different types of computer system once several suppliers gravitated to a set of common standards ASCII character set rather than, say, EBCDIC or anything specific to one company, but earlyeconomy models often supported only capital letters such as the original ADM 3, the Data General model 6. ROM and the Heathkit H9RS 2. A current loops2. Some type of blinking cursor that can be positioned with arrow keys or home and other direct cursor address setting codes. Implementation of at least 3 control codes Carriage Return Ctrl M, Line Feed Ctrl J, and Bell Ctrl G, but usually many more, such as Escape sequences to provide underlining, dim or reverse video character highlighting, and especially to clear the display and position the cursor. Starting with the Datapoint 3. Lear Siegler, ADDS, Data General, DEC, Hazeltine Corporation, HeathZenith, Hewlett Packard, IBM, Televideo, and Wyse, many of which had incompatible command sequences although many used the early ADM 3 as a starting point. The great variations in the control codes between makers gave rise to software that identified and grouped terminal types so the system software would correctly display input forms using the appropriate control codes In Unix like systems the termcap or terminfo files, the stty utility, and the TERM environment variable would be used in Data Generals Business BASIC software, for example, at login time a sequence of codes were sent to the terminal to try to read the cursors position or the 2. Data General Dasher terminals, 4 for ADM 3. A51. 11. 2 terminals, 0 or 2 for TTYs with no special features that would be available to programs to say which set of codes to use. The great majority of terminals were monochrome, manufacturers variously offering green, white or amber and sometimes blue screen phosphors. By augmenting human intellect we mean increasing the capability of a man to approach a complex problem situation, to gain comprehension to suit his particular needs. Como Actualizar Windows Vista A Windows 7 Gratis. Amber was claimed to reduce eye strain. Terminals with modest colour capability were also available but not widely used, for example a colour version of the popular Wyse WY5. WY3. 50, offered 6. Intelligent terminalseditAn intelligent terminal does its own processing, usually implying a microprocessor is built in, but not all terminals with microprocessors did any real processing of input the main computer to which it was attached would have to respond quickly to each keystroke. The term intelligent in this context dates from 1. Notable examples include the IBM 2. IBM 2. 26. 0, predecessors to the IBM 3. System3. 60 in 1. Latest Version Realplayer 2010 here. From the introduction of the IBM 3. Download Software Philosophy For Beginners Richard Osborne Pdf on this page. DEC VT1. 00 1. 97. VDU technology improvements, yet not all programmers used the features of the new terminals backward compatibility in the VT1. Televideo terminals, for example, with dumb terminals allowed programmers to continue to use older software. Some dumb terminals had been able to respond to a few escape sequences without needing microprocessors they used multiple printed circuit boards with many Integrated Circuits the single factor that classed a terminal as intelligent was its ability to process user input within the terminalnot interrupting the main computer at each keystrokeand send a block of data at a time for example when the user has finished a whole field or form. Most terminals in the early 1. ADM 3. A, TVI9. 12, Data General D2, DEC VT5. ANSI terminals in 1. ADM and TVI models did have a primitive block send capability. The advance in microprocessors and lower memory costs made it possible for the terminal to handle editing operations such as inserting characters within a field that may have previously required a full screen full of characters to be re sent from the computer, possibly over a slow modem line. Around the mid 1. Providing even more processing possibilities, workstations like the Televideo TS 8. CPM 8. 6, blurring the distinction between terminal and Personal Computer. Another of the motivations for development of the microprocessor was to simplify and reduce the electronics required in a terminal. That also made it practicable to load several personalities into a single terminal, so a Qume QVT 1. Frequently emulated terminal types included The ANSI X3. VT1. 00, Heathkit H1. ANSI mode, Televideo 9. Data General D4. 60, and Qume QVT 1.