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Text File | 1990-08-27 | 11.9 KB | 242 lines

Introduction & Disclaimer: I stole this chunk of description from the MS-Kermit documentation without Cristine Gianone or Joe Doupnik's permission after trying to get a hold of them through e-mail. If either of them really protest I will re-write it. I do note their copyright notice here however: Copyright (C) 1981,1988 Trustees of Columbia University in the City of New York Permission is granted to any individual or institution to use, copy, or redistribute this document so long as it is not sold for profit, and provided this copyright notice is retained. NCSA Telnet contains a subset of the kermit verbs listed here. Kermit verbs with a star are supported and the others will cause an error if they are in a keyboard mapping file. I have also included a utility from the MS-Kermit 2.32 distribution which will determine what the actual kermit key code is for any combination of keys. Use this in the keyboard mapping file as the code to map from. See the telnet.key file included with this release for an example keyboard mapping file. NCSA Telnet does not support the extended SET KEY options such as: SET KEY ON SET KEY OFF or SET KEY CLEAR Also, it is impossible to map the ALT+alphabetical keys to anything with the keyboard mapping interface. NCSA Telnet traps these internally before they actually reach the mapping interface. SET KEY Syntax: SET KEY key-specifier [key-definition] Also: SET KEY {ON, OFF, CLEAR} WARNING: The format and functions of this command have changed substan- tially since version 2.29B and earlier. The changes were made in order to allow key redefinition to work on a wider variety of systems and keyboards without customization of the program source code for each configuration. See section 1.12 for further details. Typical uses of SET KEY: - You're used to having the ESC key in the upper left corner of the keyboard, but your new PC keyboard has an accent grave ("`") there. You can use SET KEY to make the accent key transmit an ESC, and you can assign accent grave to some other key. - You send a lot of electronic mail, and always sign it the same way. You can put your "signature" on a single key to save yourself a lot of repetitive typing. - You must set up your PC's function keys or numeric keypad to work properly with a host application. - You have trouble with Kermit's 2-character escape sequences (like Ctrl-] C), and you want to assign these functions to single keys, like F10. The SET KEY command does these things and more, and SHOW KEY gives us assis- tance. A key can be defined to: - send a single character other than what it would normally send, - send a string of multiple characters, - invoke a CONNECT-mode Kermit action verb, - send itself again. SET KEY specifies that when the designated key is struck during terminal emula- tion, the specified character or string is sent or the specified Kermit action verb is performed. Key definitions operate only during CONNECT, not at Kermit-MS> or DOS command level. The key-specifier is the identification of the key expressed in system-depend- ent terms. This can be a letter, such as Q for the key which produces an up- percase Q, or the numeric ASCII value of the letter in backslash notation (e.g. "\81"), or else the numerical "scan code" observed by the system when the key is pressed (e.g. "\3856" for Ctrl-Alt-Shift-Q on an IBM PC). Material printed on keycaps is not necessarily a guide to what the key-specifier should be. When the word CLEAR is used in place of a key-specifier, all key definitions are cleared and then any built-in definitions are restored. A string definition is one or more characters, including 8-bit values expressed in backslash form, such as SET KEY \315 directory\13 IBM F1 key sends "directory<cr>" SET KEY S X S key sends upper case X (a mean trick) SET KEY T \27[m T key sends three bytes: ESC [ m SET KEY \2336 {del }xxx Alt-D sends "del " SET KEY \324 \Kexit F10 escapes back to Kermit-MS> prompt. The string begins with the first non-spacing character following the key iden- tification and continues until the end of line, exclusive of any trailing spaces. If a semicolon comment is used and the definition is given in a TAKE file, the line ends at the last non-spacing character before the semicolon. Curly braces, {...}, can be use to delimit the string in case you want the definition to include trailing spaces. All text after the closing bracket is ignored. This manual does not contain a list of all the scan codes for all the keys on all the keyboards on all the PCs supported by MS-Kermit -- that would be a manual in itself. Rather, in order to obtain the key-specifier for the SET KEY command, you must type a SHOW KEY command and then press the desired key or key combination. This will report a scan code that you can use as the key specifier in a SET KEY command. To do this for many keys is a laborious process, so you should collect all your SET KEY commands into a file, which you can TAKE, or put them in your MSKERMIT.INI file. If you enter SET KEY by itself, with no key specifier, the command will prompt you to press the selected key and again for the definition string. Certain characters, like ESC and CR, may not be entered literally into the string, but can be included by inserting escape codes of the form \nnn, a backslash fol- lowed by a 1- to 4-digit number corresponding to the ASCII value of the desired character. Where an ASCII digit follows directly after a backslash number, confusion can be avoided by placing curly braces {} around the backslashed num- ber; thus, \{27}5 represents the two ASCII characters ESC and 5. Here is an example of the use of SET KEY to assign ESC (ASCII 27) to the accent grave key. First the user gets the key-specifier for the key: Kermit-MS>show key Push key to be shown (? shows all): ` ASCII char: ` \96 decimal is defined as Self, no translation. Free space: 129 key and 100 string definitions, 837 string characters. The free space report says that 129 more keys may be redefined, and up to 100 of them may have multi-character strings assigned to them (as opposed to single characters), and that there are 837 bytes left for these strings, in total. Confident that there is enough space left for a new key definition, the user proceeds: Kermit-MS>set key Push key to be defined: ` Enter new definition: \27 Once a key definition is constructed and tested, it may be entered on a single line in a command file (such as MSKERMIT.INI): set key \96 \27 To prevent accidents, SET KEY shows the current definition before asking for a new one; enter a Control-C to keep the current definition, or a carriage return to undefine the key, or a query mark (?) to see available choices. The keyboard can be restored to its startup state, that is all redefinitions removed and all built-in defitions restored, by using the keyword CLEAR in place of the key identification: SET KEY CLEAR Undefined keys which do not send ASCII characters are trapped by the keyboard translator and are rejected; a beep results from using an undefined non-ASCII key. SET KEY OFF directs MS-Kermit to read keycodes from DOS, rather than BIOS, so that console drivers like ANSI.SYS that operate at the DOS level may be used during Kermit CONNECT sessions. This would also apply to any special keyboard replacements that come with DOS-level drivers. SET KEY ON turns key definition back on, and returns Kermit to processing keystrokes at the BIOS level. Kermit Action Verbs An action verb is the shorthand expression for a named Kermit procedure, such as "generate the proper sequence for a left arrow," "show status," "send a BREAK," and others; verbs are complex actions and each verb has a name. In a key definition the verb name is preceeded by backslash K (\K) to avoid being confused with a string. Verbs and strings cannot be used together on a key. SET KEY \331 \Klfarr SET KEY \2349 \Kexit makes the IBM keyboard left arrow key execute the verb named lfarr which sends the proper escape sequence for a VT102 left arrow key (which changes depending on the internal state of the VT102). The leading \K identifies the definition as a Kermit verb, so no string can start as \K or as \{K in upper or lower case (use \92K). The second example has Alt-X invoking the Leave-Connect-Mode verb "exit" (same as Kermit escape character "^]" followed by C). Each system has its own list of verbs and predefined keys. Table 1-6 shows those available for the IBM PC family (there are also some additional verbs for reassigning Heath or VT100 function keys, see section 1.17.2). The SET KEY command shows the list of available verbs when a query mark (?) is given as a definition. SHOW KEY displays all currently defined keys or individually selected ones; SHOW KEY can be executed only interactively. ------------------------------------------------------------------------------- Verb Meaning \Kupscn Roll up (back) to previous screen \Kdnscn Roll down (forward) to next screen \Khomscn Roll up to top of screen memory \Kendscn Roll down to end of screen memory (current position) \Kupone Roll screen up one line \Kdnone Roll screen down one line \Kprtscn Print the current screen \Kdump Append the current screen to dump file \Kholdscrn Toggle hold screen mode \Klogoff Turn off session logging \Klogon Turn on session logging \Ktermtype Toggle terminal type \Kreset Reset terminal emulator to initial state \Kmodeline Toggle modeline off/on \Kbreak Send a BREAK signal \Klbreak Send a "long BREAK" signal \Khangup Drop DTR so modem will hang up phone * \Knull Send a null (ASCII 0) \Kdos "Push" to DOS \Khelp Display CONNECT help message \Kstatus Display STATUS message \Kterminals Invoke user-defined macro TERMINALS, if any \Kterminalr Invoke user-defined macro TERMINALR, if any \Kexit Escape back from CONNECT mode * \Kgold,\Kpf1 VT102 keypad function key PF1 * \Kpf2..\Kpf4 VT102 keypad function keys * \Kkp0..\Kkp9 VT102 keypad numeric keys * \Kkpdot,\Kkpminus,\Kkpcoma,\Kkpenter Other VT102 keypad keys * \Kuparr,\Kdnarr,\Klfarr,\Krtarr VT102 cursor (arrow) keys Table 1-6: Kermit-MS Verbs for the IBM PC Family * - supported in NCSA Telnet 2.3b10 ------------------------------------------------------------------------------- Some systems have preset key definitions when Kermit first begins (those for the IBM PC are shown in section 1.17.2). You can find out what they are on your system by typing SHOW KEY, and then question mark on the next line. You may supplement or change the predefined keys with SET KEY commands typed inter- actively or in MSKERMIT.INI or other command files. The MS-Kermit CONNECT command may be used in conjunction with certain console drivers that do their own key redefinitions. Since MS-Kermit intercepts keystrokes at the BIOS level, drivers like ANSI.SYS which work at the DOS level will have no effect during CONNECT, even though they work at MS-Kermit command level. Other drivers, like SuperKey and ProKey, work at the BIOS level, and their key assignments will remain effective during Kermit terminal sessions, and additional Kermit SET KEY assignments may be made "on top" of them.