home *** CD-ROM | disk | FTP | other *** search
- ________________________________________________________________________
-
- TED
- Command
-
- TED was written by Tom Kihlken, and published in PC Magazine
- TEDPLUS was apparently also written by Tom Kihlken
- TED2 is basically TED with the character string search from TEDPLUS
- and additional modifications and enhancements by:
- James E. Galbraith
- 1201 Chase st.
- Novato CA, 94945
-
- TED2.COM is the executable program file.
- TED2.ASM is the assembly language source code file.
- TEST.BAT is used to calculate the file integrity checksum byte.
-
- Even though TED2 is extensively reworked from the TED version that
- was published in PC-Magazine, the PC-Magazine copyright is still
- in effect (see "The Copyright Fight", PC Magazine February 24, 1987
- pp 61,62). I believe that this is of concern if this program were
- to be included with or incorporated in a commercial product.
- ________________________________________________________________________
-
- Purpose: TED, the tiny text editor, is a full-screen editor for
- line-oriented files of up to 64K in length. It supports
- scrolling, cut, copy, paste, and printing operations.
- Character string search and search again were added to
- TEDPLUS and TED2 (TED version 2.0). TED2 allows all 256
- characters of the IBM-PC extended ASCII set (including
- <Nul>, <CR>, and <LF>) to be entered.
-
- Format: TED [drive:][path]filespec
-
- Remarks: TED will open and read a file whose name (and path, if
- required) is initially supplied on the command line. If
- no filespec is provided, it will open a new file and then
- prompt for a filename when <F2> is pressed to save and exit.
- A legal DOS filename, and optionally a path name, must be
- provided to close the file. If it is desired to not close
- the file and return to edit mode, press the <Esc> key.
- TED2 also allows pressing any non-character (function or
- cursor) key to return to edit mode. The original of a
- modified file is saved with the extension .BAK.
- The QUIT command <Shift-F2>, when verified (with <y>, <Y>,
- or <CR>), abandons any modifications and leaves the original
- file intact. If a file has been opened for editing and
- there have been no file changes, either the <F2> or the
- <Shift-F2> key will immediately abandon the edit copy of
- the file, without altering the original file, and return to
- DOS. If the file has the Read-only attribute set, TED2
- will open the file to allow browsing, but will not allow any
- edit changes. There is no "load" or "save" file function
- from within TED.
-
- TED uses certain DOS functions that require DOS version 2.0
- or higher to run. TED2 has incorporated a DOS version test,
- and exits with a message if the test fails. TED2 also
- incorporates a one-byte check sum test of program integrity,
- which gives a 99.7% confidence level that the program file
- has not been accidently corrupted.
-
- Lines may be any length, and each must be terminated by
- pressing <Enter> (the end-of-line marker is <CR><LF>).
- Lines longer than the screen width display a diamond in the
- rightmost column. Offscreen characters (up to 248 columns)
- may be viewed by using the Ctrl-arrow keys to move the
- window left or right. Lines may be broken by pressing
- <Enter> at any point, in either Insert or Overstrike mode.
- Lines may be joined by pressing <Del> at the line end or
- <Backspace> at beginning.
-
- One end of a "block" of text is defined by toggling the MARK
- <F4> command on, and moving the cursor with the cursor control
- keys to the other end of the block. The marked area is shown
- in inverse video. Pressing CUT <F5> removes it to a buffer
- from which it can be pasted <Shift-F5> at any point where the
- cursor is located. The paste buffer remains intact until
- another section is marked and cut. The paste buffer has room
- for 64K bytes. If the MARK toggle is on, pressing PRINT <F3>
- prints the marked text (directly from the file buffer).
- Pressing <Shift-F3> will output a Form-feed character to
- position the printer to the top of the next page.
-
- Pressing DEL_L <F9> or <Shift-F8> deletes the entire line
- and closes the gap. Pressing DEL_EOL <F8> or <Alt-D>
- deletes from the cursor position to the end of the present
- line. Pressing UDEL_L <F10> restores the most recent line
- deletion. The line delete buffer remains intact until
- another line is deleted. The line delete buffer has room
- for 255 characters.
-
- The UNDO <F7> command restores up to 255 characters deleted
- by the <Del> key or over written while in the Overstrike mode.
- The UNDO buffer is cleared when the cursor is moved. It
- will only restore the last key deleted with the <Backspace>
- key (the <Backspace> key is implemented as <Left-arrow><Del>).
-
- TEDPLUS added a string SEARCH and SEARCH AGAIN function.
- In TED2, <F6> or <Alt-S> is SEARCH, and <Shift-F6> or
- <Alt-A> is SEARCH AGAIN. When the <F6> is pressed, the
- prompt "SEARCH> " appears on the bottom line. Enter the
- desired text string and press the <ENTER> key. If the
- string is found, it appears in inverse video on the screen.
- To search for the next occurance of the string, press
- <Shift-F6>. The inverse video is extinguished when any
- key is pressed.
- NOTE: TEDPLUS and TED2 use a DOS function to enter the search
- string. As a result, TED2 can enter characters that cannot
- be searched for. These are <Nul>, <LF>, <CR>, and <Esc>.
-
- Text is entered in insert mode by default. Pressing the
- <Ins> key toggles between Insert and Overstrike mode. The
- Insert/Overstrike state is displayed by an 'I' or 'O' in
- the lower right corner of the screen. If the file has the
- Read-only attribute set, an 'R' is displayed in the lower
- right corner of the screen and no edit changes may be made
- to the file.
-
- The ASCII Backspace (BS) code can
- be entered as <Ctrl-H>, the Cariage return (CR) code, as
- <Ctrl-M>, and the Line feed (LF) code, as <Ctrl-J>. The
- <Enter> key enters a new-line (CR)(LF) marker, and the
- <Backspace> key deletes the character to the left of the
- cursor. Any of the characters in the IBM extended ASCII
- set (except <Nul>, 00H) can be entered by pressing the Alt
- key, typing its ASCII decimal value on the numeric keypad,
- then releasing the Alt key. TED2 allows entering the <Nul>
- code with <Shift-F1>.
-
- TED2 does not use the CPM style End-of-file marker, <Ctrl-Z>,
- to indicate the last character in a text file. If a Ctrl-Z
- character appears in the file, it is ignored.
-
- TED configures itself to the display in use, and supports
- EGA and VGA text modes other than the standard 80 columns
- by 25 rows (eg. EGA 43 lines). It does not alter screen
- attributes or colors. Inverse video is used to indicate
- a MARKed block. TED2 uses blinking inverse video to indicate
- that the search string has been found. PgUp and PgDn scroll
- the file by the number of rows displayed, minus five. It
- automatically handles "de-snow" on a CGA display. Because
- TED makes BIOS calls and writes directly to the screen buffer,
- it could have problems with MS-DOS computers that are not
- sufficiently IBM-PC compatible.
-
- TED was written by Tom Kihlken and was published in PC
- Magazine in November 1988. TEDPLUS appears to have also been
- written by Tom Kihlken in November 1988. It was obtained
- from a Bulletin board service in June of 1989. I entered
- TED from the magazine article listing when it was published.
- I found and fixed some minor bugs and added some enhancements.
- When I obtained TEDPLUS, I incorporated SEARCH and several
- other functions into my version of TED. I also added a HELP
- screen. TEDPLUS attempted to allow entering any key code
- into a file. The ASCII <CR> and <LF> codes can now be
- directly entered as <Ctrl-M> and <Ctrl-J>. If they are
- entered together, or ever become ajacent, they become an
- end-of-line marker. The end-of-line marker may not ever be
- separated into <CR><LF> characters to keep TED2 from losing
- track of the cursor location. The <Shft-F1> key is now used
- to enter the <Nul> character, making it possible to enter
- all of the 256 IBM extended ASCII set. The screen update
- has been changed to look for any keys-waiting at the end of
- each line to improve the keyboard responsiveness. This is
- especially noticable when scrolling the file up or down.
- To protect against a possible corrupted program file, there
- is a one-byte program check sum test which is run when the
- program is started. The inverse of the check sum value is
- returned as a DOS ERRORLEVEL code (the reason it is limited
- to one byte). If the check sum value is not zero, the
- program terminates with the message "TED altered".
- On top of everything else, TED2.COM is still a tiny program.
- It fits in 4096 bytes, four clusters on a 360K floppy disk.
-
-
- Keypad Commands:
-
- Up Arrow Moves cursor up one row
- Down Arrow Moves cursor down one row
- Left Arrow Moves cursor left one column
- Right Arrow Moves cursor rigght one column
- PgUp Moves text window up one page
- PgDn Moves text window down one page
- Home Moves cursor to start of line (if already
- at start of line, moves up one line)
- End Moves cursor to end of line (if already at
- end of line, moves to end of next line)
- Ins Toggles Insert/Overstrike mode (I/O)
- Del Deletes character under cursor (to right)
- Backspace Deletes character to left of cursor
- Ctrl-Home Moves text window to top of file
- Ctrl-End Moves text window to bottom of file
- Ctrl-PgUp (same as <PgUp><PgDn>, moves text window up)
- Ctrl-PgDn (same as <PgDn><PgUp>, moves text window down)
- Ctrl-Right Arrow Moves text window right eight columns
- Ctrl-Left Arrow Moves text window left eight columns
- Esc Enters <Esc> char/Aborts <F2> command
- Ctrl-C Enters <Ctrl-C> char (DOS abort is disabled)
- Enter Start new line, adds <CR><LF> pair to file.
-
-
- Editing Functions:
-
- Help F1 Help screen
- <Nul> Shft-F1 Adds <Nul> character (00H) to file
- Exit F2 Saves changes and exits
- Quit Shft-F2 Exits without saving changes
- Print F3 Prints the marked (by F4) text
- FormFeed Shft-F3 Outputs a form feed to the printer.
- Mark F4 Toggles mark state on/off
- Cut F5 Moves marked (by F4) text to paste buffer
- Paste Shft-F5 Inserts contents of paste buffer at cursor
- Search F6 Search for a (case insensitive) string
- Src/Nxt Shft-F6 Search again for same string
- UnDo F7 Replaces recently deleted characters
- Del EOL F8 Delete from cursor to the end of line
- Del L Shft-F8 Delete the current line (from Multi-Edit)
- Del L F9 Delete the current line
- Udel L F10 Inserts the last deleted line
-
- Search Alt-S Search
- Src/Nxt Alt-A Search again
- Del EOL Alt-D Delete to EOL