________________________________________________________________________ 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