Difference between revisions of "Video terminal"
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Very early model provided only the same motion controls as their printing predecessors - line feed, carriage return, etc. However, the ability to move the [[cursor]] to specific screen locations was soon added, which made possible a predecessor of [[WYSIWYG]], to wit, [[screen editor]]s such as [[Emacs editors|EMACS]]. | Very early model provided only the same motion controls as their printing predecessors - line feed, carriage return, etc. However, the ability to move the [[cursor]] to specific screen locations was soon added, which made possible a predecessor of [[WYSIWYG]], to wit, [[screen editor]]s such as [[Emacs editors|EMACS]]. | ||
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| + | A few had the capability to do [[graphics]], such as lines, points, etc. | ||
Once [[semiconductor]] [[Random Access Memory|RAM]] prices fell low enough, they were replaced with [[bit-mapped display]]s, although the latter were directly connected to the computer's main [[bus]], usually on a [[personal computer]]. | Once [[semiconductor]] [[Random Access Memory|RAM]] prices fell low enough, they were replaced with [[bit-mapped display]]s, although the latter were directly connected to the computer's main [[bus]], usually on a [[personal computer]]. | ||
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==See also== | ==See also== | ||
| − | * [[ | + | * [[:Category:Video Terminals]] |
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Revision as of 00:14, 8 June 2018
A video terminal was a device used to allow a user to do input/output to a computer; it usually communicated with the computer via asynchronous serial line. It was effectively roughly the same as the earlier printing terminals such as Teletypes, but with characters being 'painted' on a CRT via a purely electronic process, instead of being printed on paper by a mechanical system.
The original chief advantage was speed, since the all-electronic mechanism could run at much higher speeds; the disadvantage was that only a limited amount of information could be displayed at one time. (This was particularly true as early ones could only display very limited amounts of text - some as small as 12 lines of 40 characters).
Very early model provided only the same motion controls as their printing predecessors - line feed, carriage return, etc. However, the ability to move the cursor to specific screen locations was soon added, which made possible a predecessor of WYSIWYG, to wit, screen editors such as EMACS.
A few had the capability to do graphics, such as lines, points, etc.
Once semiconductor RAM prices fell low enough, they were replaced with bit-mapped displays, although the latter were directly connected to the computer's main bus, usually on a personal computer.
