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There are at least two major text editors named EDT: one was made by Digital Equipment Corporation, the other by RCA for its TSOS operating system for its Spectra series mainframes. The RCA version was later sold to Sperry Univac (which later became Unisys), was released for the VS/9 operating system, and is currently in use on Fujitsu BS2000 OSD Mainframes and the BS2000 Operating system. Other than sharing a name, neither editor had any relation to each other in method of operation, use, or functionality. Digital's EDT ran on minicomputers, could respond to single keystrokes, and used function keys to implement commands to the editor. RCA/Univac/Fujitsu's EDT ran on mainframes, could only respond to a full line (or multiple lines separated by return) after the transmit key is pressed, and uses commands are entered in the typed-in text when preceded by the command symbol (the at sign "@" which can be changed.) ==Digital== EDT is a text editor that was developed by Digital Equipment Corporation (DEC) for use on its PDP-11 series of computers (including RSX-11,〔(【引用サイトリンク】title=RSX INDIRECT and EDT Grab Bag )〕 RSTS/E〔(【引用サイトリンク】format=PDF )〕 and RT-11), and later for its VAX/VMS series as well.〔(【引用サイトリンク】title=VMS History )〕 EDT was introduced originally as a line-mode editor. The screen mode was developed first as the Keyboard Editor (KED) on RT-11 as part of the FMS-11 project by Darrell Duffy; EDT on the other operating systems was then enhanced to be compatible with KED. The editor contained both line mode commands and a screen based editor. In screen mode, the default action for the user was to directly update text as he or she typed, with special commands available by pressing keypad commands. Arrow keys allowed for simple navigation, while keypad commands allowed for more complex navigation and searches. As with many user interfaces developed around this time, EDT used the "Gold Key" style of input first developed for the WPS-8 word processing system. "Gold Key" editing used the PF1 keypad key as a prefix key allowing the introduction of a wide variety of commands using both the keypad keys and keys on the main keyboard. Pressing the PF2 keypad key would give on-screen help on the keypad and other key combinations: /-----------------------------------\ /-----------------------------------\ | ^ | DOWN | | | | | | FNDNXT | DEL L | | | | | | <---- | ----> | | GOLD | HELP | | | | | | | | LEFT | RIGHT | | | | FIND | UND L | | UP | v | | | |--------+--------+--------+--------| \-----------------------------------/ | PAGE | SECT | APPEND | DEL W | DELETE Delete character | | | | | LINEFEED Delete to beginning of word | COMMAND| FILL | REPLACE| UND W | BACKSPACE Backup to beginning of line |--------+--------+--------+--------| CTRL/A Compute tab level | ADVANCE| BACKUP | CUT | DEL C | CTRL/D Decrease tab level | | | | | CTRL/E Increase tab level | BOTTOM | TOP | PASTE | UND C | CTRL/K Define key |--------+--------+--------+--------| CTRL/R Refresh screen | WORD | EOL | CHAR | | CTRL/T Adjust tabs | | | | ENTER | CTRL/U Delete to beginning of line |CHNGCASE| DEL EOL| SPECINS| | CTRL/W Refresh screen |-----------------+--------| | CTRL/Z Exit to line mode | LINE | SELECT | | | | | SUBS | Press a key for help on that key. | OPEN LINE | RESET | | To exit, press the spacebar. \-----------------------------------/ Users could configure default actions or define key sequences for their editor by placing EDT commands in an initialization file which would be executed upon starting the editor. DEC later developed TPU, a powerful language for designing text editors on its VMS systems. TPU was used to produce a new standard text editor, EVE, as well as to rewrite EDT. EVE included an emulator of the EDT screen mode keypad for the benefit of those who were used to particular key functions. Both EVE and the TPU implementation of EDT are still distributed with OpenVMS. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EDT (text editor)」の詳細全文を読む スポンサード リンク
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