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1. CP/M-80 KERMIT ******** This document is formatted as an ordinary, plain text ASCII disk file. Typeset copies are available in the Kermit User Guide from Columbia University. Changes should be made to CPKERM.MSS. ******** Program: Bill Catchings, Columbia University, with contributions from Charles Carvalho (ACC), Bernie Eiben (DEC), Nick Bush (Stevens), John Bray (University of Tennessee), Bruce Tanner (Cerritos College), Greg Small (University of California at Berkeley), Kimmo Laaksonen (Helskini University of Technology), Brian Robertson (Aberdeen University), A.J. Cole (Leeds University), John Shearwood (Birmingham University), Tony Addyman (Salford University), Godfrey Nix and Martin Carter (Nottingham University), Ian Young (Edinburgh University), Chris Miles (Manchester University), Richard Russell, Dave Roberts, and many, many others. Language: 8080 Assembler, M80, or MAC80 Version: 4.09 Date: 11th January, 1988 Documentation: Charles Carvalho, ACC; Frank da Cruz, Columbia, Bertil Schou, Loughborough University (with lots of help from Jon Warbrick of Plymouth Polytechnic), and many others. KERMIT-80 Capabilities At A Glance: Local operation: Yes Remote operation: Partial, Auto-receive only Login scipts: No Transfer text files: Yes Transfer binary files: Yes Wildcard send: Yes File transfer interruption: Yes Filename collision avoidance: Yes, poor Can time out: Yes 8th-bit prefixing: Yes Repeat count prefixing: No Alternate block checks: Yes Terminal emulation: Yes, VT52 and others Communication settings: Yes; duplex, parity Support for dial-out modems: No Transmit BREAK: Yes; most versions IBM communication: Yes Transaction logging: No Debug logging: No Session logging: Yes Raw file transmit: Yes Act as server: No Talk to server: Yes; SEND, GET, FIN, BYE Advanced commands for servers: No Command/init files: Yes Command macros: No Local file management: Yes; DIR, ERA, TYPE, PRINT, COPY Handle file attributes: No Extended packets: No Sliding Windows: No Printer control: Yes, better, but not perfect 1.1. Summary of CP/M There are essentially two versions of CP/M - Versions 2.2 and 3.0 (sometimes also called CP/M PLUS.) CP/M-80 Version 2.2 is run in a single 64 Kbyte "page", usually the largest amount of memory on Z80 or 8080 systems. The BIOS (Basic input/output system), BDOS (Basic Disk Operating System) and CCP (Command console processor) all share memory with any transient program the user may wish to run. Some basic commands are available through the CCP, like DIR, ERA etc,while others are loaded from disk into the transient program area and run as a program, like PIP or STAT. CP/M Version 3.0 (or CP/M PLUS) effectively removes the requirement of having the CCP and BDOS along with a chunk of the BIOS code being resident in the single 64k byte page of memory. This allows even more space for programs in the TPA, but still a little less than the maximum of 64k. It is substantially different from CP/M version 2.2, with lots of added features. Kermit-80 uses very few additional version 3.0 features, and only where absolutely necessary. CP/M file specifications are of the form DEV:XXXXXXXX.YYY, where DEV: is a device name, normally the A: or B: floppy. If omitted, the device name defaults to your connected diskette. XXXXXXXX is a filename of up to 8 characters. YYY is the file type, up to 3 characters. File names and file types may contain letters, digits, and some special charac- ters, including dash, dollar sign, and underscore, but no imbedded spaces. Up- per and lower case letters are equivalent. "Wildcard" file-group specifications are permitted in file names and file types (but not device names) within certain contexts; a "*" matches a whole field, a "?" matches a single character, including space. Examples: "*.F??" specifies all files whose types start with F and are 1, 2, or 3 characters long; "F?.*" specifies all files whose names start with F and are no more than two charac- ters long (before the trailing spaces). The five CP/M commands are: DIR file Lists the the names of the specified files. The default file specification is "*.*". Example: "DIR B:*.FOR". ERA file Erases (deletes) the specified file(s); wildcards allowed. REN new old Changes the name of a file from old to new, e.g. "REN NEW.FOR=OLD.FOR". SAVE Saves the specified number of memory blocks into a file. (Not on CP/M Plus systems) TYPE file Types the specified file on the screen, e.g. "TYPE FOO.TXT". The most important programs are: STAT Gives statistics on disk usage; sets and displays IOBYTE. (Not on CP/M Plus systems) PIP Peripheral Interchange Program. Copies files. In response to the "*" prompt, give a command of the form disk:outfile=disk:infile Wildcards ("*" for a whole field or "?" for a letter) can be used. Examples: "A:=B:*.*" to copy a whole disk, "A:=B:*.FOR" to copy all the Fortran programs from disk B to disk A. If the disk specification is omitted, your "connected" disk is as- sumed. Command line arguments are also accepted, e.g. "PIP A:=B:*.*". There are equivalent commands for CP/M Version 3.0, but are not loaded into memory in the same way as for CP/M Version 2.2. For further information on CP/M, consult your microcomputer manual or a CP/M handbook. 1.2. Kermit-80 Description Since Kermit-80 runs on a standalone micro, it is always in control of the screen -- it is always local. Thus, it always keeps the screen updated with the file name and the packet number, whether sending or receiving. Kermit-80 is capable of an imprecise or "fuzzy" timeout on an input request, and can break deadlocks automatically. In most cases, this is not important, because the KERMIT on the other side is most likely able to handle the timeouts. The timeouts done by Kermit-80 are fuzzy because they depend on the speed of the processor and other factors that can vary from system to system. If, despite the timeout capability, the transmission appears to be stuck (and you can tell that this has happened if the screen fails to change for a while) you can type carriage return to have the micro do what it would have done on a timeout, namely NAK the expected packet to cause theforeign host to send it again (or, if the micro is sending, to retransmit the last packet). Micro/ micro or micro/IBM-mainframe transfers could require this kind of manual inter- vention. File transfers may be interrupted in several ways. Control-C This will return you to Kermit-80 command level immediately, so that you can connect back to the remote system, or take any other desired action. Control-X When sending a file, this will terminate the sending of the current file with a signal to the KERMIT on the other side to discard what it got so far. If there are more files to be sent, KERMIT-80 will go on to the next one. When receiving a file, KERMIT-80 will send a signal to the remote KERMIT to stop sending this file. If the remote KERMIT understands this sig- nal (not all implementations of KERMIT do), it will comply, otherwise the file will keep coming. In any case, the remote KERMIT will go on to the next file in the group, if any. Control-Z Like Control-X, except if a file group is being transmitted, this will stop the transmission of the entire group. If only a single file is being transmitted, it works exactly like Control-X. Carriage Return If you type a carriage return Kermit-80 will resend the current packet. You may do this repeatedly, up to the packet retry limit (somewhere between 5 and 16 times) for a particular packet. KERMIT-80 COMMANDS KERMIT-80 uses the DECSYSTEM-20 keyword style command language. Each keyword may be abbreviated to its minumum unique length. "?" may be typed to request a menu of the available options for the current field at any point in a command. ESC may be typed at any point in a command to fill out the current keyword or filename; if sufficient characters have not been typed to identify the current field uniquely, KERMIT-80 will sound a beep and allow you to continue from that point. BREAK Send a Break condition to the remote computer. This is only possible if your system is capable of sending breaks. It is intended to be used with PAUSE, STRING etc and the TAKE command to do weird and wonderful things, like automatic logging on to a remote host. BYE When talking to a remote Kermit Server, this command shuts down the server and logs it out, and also exits from Kermit-80 to CP/M command level. CONNECT Establish a "virtual terminal" connection to any host that may be con- nected to the serial port, i.e. pass all typein to the serial port and display all input from the serial port on the screen. Also, emulate a DEC VT52 to allow cursor control, screen clearing, etc., if VT52-EMULATION is ON (see below), in which case you should also set your terminal type on the remote host to VT52. (Some versions emulate other terminals.) Warning: VT52 emulation is only successful if your system or its at- tached terminal can do the same sort of functions as a genuine VT52. Things to beware of are cursor addressing, clear to end of page and end of line, clear screen, home cursor, and clear-and-home functions. The useability of VT52 emulation depends entirely on how many of the VT52 functions can be emulated by your terminal. The escape character differs from micro to micro; when you issue the CONNECT command, the micro will print a message telling you how to get back. The escape sequence is generally an uncommonly-used control character, like CTRL-backslash or CTRL-rightbracket, followed by a single letter "command": C Close Connection, return to Kermit-80> command level. S Display Status of connection, but maintain remote connection. ? List available single-character commands. 0 (zero) Send a null (0) character. B Send a BREAK signal. Most systems provide this function. D Drop the line. Used on the Apple with modem. Automatically closes the connection after dropping the line. The TORCH system acknowl- edges this command but does nothing. P Toggle printer on or off. Allows you to copy whatever goes to the screen to the printer. S Temporarily suspend logging to the log file. Q Restart logging to the log file ^] (or whatever - a second copy of the escape character) Send the es- cape character itself to the remote host. DIRECTORY This provides a directory listing of the specified files. If no files are specified, all files on the default disk are listed. File sizes, in K, are included. You may interrupt the listing at any time by typing any character. The listing (even if interrupted) concludes with a display of the amount of free storage left on the disk. You can in- hibit the display of file sizes by SET DIRECTORY OFF. ERASE filespec This executes the CP/M ERA command on the specified file(s). The names of the files being erased are not displayed. EXIT Quit back to CP/M. The return is made by a JMP 0 (Warmstart) FCOPY source destination Copy a named file to another file, either on the same drive or another drive. FINISH Like LOGOUT, but shuts down the remote server without logging it out. Leaves you at Kermit-80 command level; subsequent CONNECT commands will put you back at host system command level. GET filespec (local_filespec) When Kermit-80 is talking to a Kermit Server on the host, you should use the GET command to request the server to send files to you, for ex- ample: get hlp:k*.hlp You may specify a local filename if you want to save the remote file under a different filename. Limitation: If you request an alternate block check type using the SET BLOCK command, the GET command will not communicate it to the remote server. If you want to have type 2 or 3 block checks done when getting files from the server, you have to issue the appropriate SET BLOCK command to the remote KERMIT before putting it in server mode. HELP List all these commands, with a short description on what the commands do. A question mark will do the same. If you have already typed a command but do not know what the parameters are, type a space (to in- dicate the end of the command) and a question mark. You will be in- formed of what Kermit can expect at that stage. INPUT time_delay string Setup a string and time delay for your CP/M system to expect from the host, then wait for that sting to be sent to your CP/M-80 system. LOG filespec When CONNECTed to a foreign host as a terminal, log the terminal ses- sion to the specified diskette file. This functionality depends to some extent on the remote host's ability to do XON/XOFF flow control, and does not guarantee a complete transcript (after all, that's what the KERMIT protocol is for). The log file is closed when the connec- tion is closed by typing the escape character followed by the single- character command "C". LOG (append) It is possible to temporarily suspend logging during connect state. Typing an escape sequence can turn file logging on (<escape-character> R for Resume) or off (<escape-character> Q for quiet). Re-entering connect state will re-open the previously opened log file and append to that file. LOGOUT Like BYE, but leaves you at Kermit-80 command level. PAUSE delay_period If this command is issued your CP/M system will wait a while before proceeding with another command. This is intended for use in TAKE com- mands, where you may want to pause for a while before proceeding with the rest of the TAKE file. The actula delay is very variable between systems, and values should be determined on a trial and error basis. PRINT Print a file to the console and printer. Output to the printer is buf- fered by the Kermit maintained printer buffer This routine is identical to TYPE but characters are echoed to the printer as well as to the screen. Suspending and aborting output is as described in TYPE. RECEIVE filespec Receive file(s) from the remote Kermit, and save them under the names provided in the file headers supplied by the remote host. If a local filespec is given, the file is saved under the given filename. If the names aren't legal, use as many legal characters from the name as pos- sible (see the description of SET FILE-WARNING below). If there's a conflict, and FILE-WARNING is ON, warn the user and try to build a unique name for the file by adding "&" characters to the name. SEND filespec Send file(s) specified by filespec to the remote Kermit. The filespec may contain CP/M wildcards. SET parameter [value] Set the specified parameter to the specified value. Possible parameter settings: AUTORECEIVE ON (or OFF). Allows several files to be received without having to type RECEIVE on the receiving machine. The routine simply looks for activity on the serial line, and if so fudges a RECEIVE command. The packet sent by the sender will be lost. BAUD-RATE value Change the baud rate of the communications port. This command only works on some systems. value is the numeric baud rate (300, 9600, etc.) desired. Type SET BAUD followed by a ques- tion mark for a list of supported baud rates. On systems that do not support this command, you must set the port baud rate from CP/M or other setup mechanism outside of KERMIT-80. BLOCK-CHECK-TYPE option The options are: 1-CHARACTER-CHECKSUM Normal, default, standard 6-bit checksum. 2-CHARACTER-CHECKSUM A 12-bit checksum encoded as two characters. 3-CHARACTER-CRC-CCITT A 16-bit CCITT-format Cyclic Redundancy Check, encoded as 3 characters. BUFFER-SIZE value This allows you to set a buffer size during transfer of data. On some systems it takes so long that the remote end times out while the local system is reading or writing to disk. The size is the number of 128 disk sectors (nominal) and can be from 1 (128 bytes) to 64 (8 kbytes). CASE-SENSITIVITY ON (or OFF) Kermit-80 usually maps lower case characters to upper case character, but there may be times when lower case should be left alone. SET CASE-SENSITIVITY ON will do this-but only for some functions. CP/M-80 filenames will still be mapped to uppercase characters. DEBUG ON (or OFF). Enables/disables displaying of packets on the screen during file transfer. Not performed if the QUIET option has been set for the terminal (ie SET TERMINAL QUIET) DEFAULT-DISK drive letter This allows you to set the default disk as source and destina- tion of file transfers. In addition, issuing this command causes you to switch to the specified disk and log it in, write-enabled. The colon must be included in the disk name (A:). The selected disk appears in your KERMIT-80 prompt, for instance Kermit-80 14A:> DIRECTORY-FILE-SIZE ON (or OFF). By setting DIRECTORY-FILE-SIZE OFF you can get an abreviated listing of your disk drive. File sizes are not calculated, and five files are shown on a line. Setting this option ON will show file sizes of each file. Both options will list the free space remaining. ESCAPE Change the escape character for virtual terminal connections. Kermit-80 will prompt you for the new escape character, which you enter literally. FILE-MODE option Tells KERMIT-80 what kind of file it is sending, so that KERMIT can correctly determine the end of the file. SET FILE BINARY means to send all the 128-byte blocks (ie logical CP/M sectors) of the file, including the last block in its entirety; SET FILE ASCII is used for text files, and transmission stops when the first Control-Z is encountered anywhere in the file (this is the CP/M convention for marking the end of a text file). SET FILE-MODE DEFAULT tells Kermit to attempt to determine the file type by examining the file being transmitted. If a Control-Z appears before the last block of the file, it is as- sumed to be BINARY; if, when the first Control-Z is encoun- tered, the remainder of the file contains only control-Z's, it is assumed to be a text file. Unfortunately, not all programs fill the remainder of the last record of a text file with Control-Z's, so this algorithm is not always successful. If binary transmission is used on a text file, or a compressed file (eg a .DQC file) some extraneous characters (up to 127 of them) may appear at the end of the file on the target system. If ASCII transmission is used on a binary file, any 8th bits set will be stripped and a warning sent to the console. When the first control-Z is encountered, the file is assumed to be at the end, even if it is not. FLOW-CONTROL ON (or OFF) Sets XON/XOFF flow control on or off. If set ON the host is expected to respond to an XOFF or XON sent by Kermit-80. If set off, no flow control is assumed and any XON/XOFF is ig- nored. IBM ON (or OFF) Allow the transfer of files to and from an IBM mainframe com- puter. This makes Kermit-80 wait for the IBM turnaround character (XON), ignore parity on input, add appropriate parity to output, and use local echoing during CONNECT. As dis- tributed, KERMIT-80 uses MARK parity for IBM communication. If you don't give this command, IBM mode is OFF. Since IBM VM/CMS KERMIT does not have timeout capability, SET IBM ON also turns on the "fuzzy timer" automatically. LOCAL-ECHO ON (or OFF) When you CONNECT to a remote host, you must set LOCAL-ECHO ON if the host is half duplex, OFF if full duplex. OFF by default. LOGGING ON (or OFF) Cease or resume logging whenever connect mode is entered. This is really only applicable after a LOG command is no longer re- quired. NO-EXIT This command is applicable only for Kermit initiated with a command tail. For example, if Kermit was initiated by: KERMIT ;SEND HELLO;NO-EXIT Kermit would first seek out and execute the KERMIT.INI file (if present), then send file HELLO to a remote system. Usually Kermit would exit back to CP/M, but NO-EXIT over-rides this. Note the leading semicolon. This clears leading spaces from the first command. PORT port name Allows you to switch between different communication ports. This command is not available on all systems. Type SET PORT ? for a list of valid options for your system. (Note: If your system does not support several ports, this command will return a "Not implemented" error if you try to set a port.) PRINTER ON (or OFF) Turns copying of CONNECT session to printer on and off. It is also possible to toggle the printer on/off from the connect state, by typing <escape character> followed by P. PARITY option Sets parity for outgoing characters to one of the following: NONE, SPACE, MARK, EVEN, or ODD. On input, if parity is NONE, then the 8th bit is kept (as data), otherwise it is stripped and ignored. The parity setting applies to both terminal con- nection and file transfer. If you set parity to anything other than none, KERMIT-80 will attempt to use "8th bit prefixing" to transfer binary files. If the other KERMIT is also capable of 8th bit prefixing, then binary files can be transferred suc- cessfully; if not, the 8th bit of each data byte will be lost (you will see a warning on your screen if this happens). RECEIVE parameter [value] Set a RECEIVE parameter. PAD-CHAR Set the PAD character to use while receiving files. Currently a dummy, as for SET SEND PAD-CHAR. PADDING [value] Set the number of PAD characters to use while receiving files. Same as SET SEND PADDING. START-OF-PACKET [value] Set the default start of Packet character for receiving files. Apply the same rules and considerations as for SET SEND START-OF-PACKET. SEND parameter [value] Set a SEND parameter. PAD-CHAR Set the Pad character to be used while sending files. It is currently a dummy entry, and does not do any- thing. PADDING [value] Set the number of PAD-CHARS to be used while sending files. This too does nothing. START-OF-PACKET Set the default start of packet character to another character than control-A. This may be necessary on systems (including intervening networks) that trap control-A characters. Choose a control character not otherwise used, ie not carriage return (13D, ODH), line feed (10D, OAN), tabs (09D, 09H), backspace (08H), and bell (07H) or any other used between you and your remote system. TACTRAP set the TAC intercept character. If you are attached to a TAC it will swallow the intercept character (commercial AT sign by default) so Kermit sends it twice. With this command you can set the intercept character (ie the one to send twice) to another character. TERMINAL option Select one of the following terminal characteristics: OFF sets emulation off, and its up to the attached terminal to respond to escape sequences sent from the remote host system. DUMB Like off, but carriage return and line feed characters are the only control characters accepted. All other control characters are simply ignored. (Really a "Glass TTY"). EXTERNAL Emulation is provided for by a routine in the system dependent part of Kermit. Attempting to set this op- tion without having and externally supplied routine will returna "Not Implemented" error. VT52 When connected as a terminal to a foreign host, the micro emulates a VT52. VT52 emulation is set by default, except on micros that already have terminal functionality built in, such as the DEC VT180 and DEC- mate (these act as VT100-series terminals). Some sys- tems emulate other terminals, like the ADM3A; see table 1-5. QUIET Do not display any file transfer information onto the console. This mode is useful if you console takes a long time to update the display. Only the file name is displayed. DEBUGging information is not displayed even if selected. REGULAR Inverse of QUIET. All packets etc displayed, as ususal. TIMER ON (or OFF) Enable or disable the "fuzzy timer". The timer is off by default, because in the normal case KERMIT-80 is communicating with a mainframe KERMIT that has its own timer. Mainframe KER- MIT timers tend to be more precise or adaptable to changing conditions. You should SET TIMER ON if you are communicating with a KERMIT that does not have a timer. You should SET TIMER OFF if you are communicating over a network with long delays. USER new user number Sets another user number to be active. Acceptable user numbers are 0 to 31, though it is recommended to use user numbers 0 to 15 only. This is really only useful for Winchester Systems with high disk capacities. WARNING ON (or OFF) Warn user of filename conflicts when receiving files from remote host, and attempt to generate a unique name by adding "&" characters to the given name. ON by default. SHOW Display all setable parameters. You will get a page or so of the status af all parameters that can be set using the SET command. STATUS The same function as Show. STRING line of text Send a character string to the host. This simply copies the string to the correct line, and assumes all appropriate parameters have been set to be used eg baudrate, parity etc. It is intended as an option for the TAKE command. TAKE filespec Take characters and commands from the specified file as if they were entered from the keyboard. This is useful if you want to set up a batch job. A command file can send, get, receive, set functions etc automatically. An automatic "TAKE KERMIT.INI" is executed from the default drive when Kermit-80 is loaded. This can be used to set defaults of band rate, parity, filetype, default drive etc. If KERMIT.INI does not exist, control is given directly to the user. TRANSMIT filespec wait character string Send the specified file to the system on the other end of the connec- tion as though it were being typed at the terminal, one line at a time. Each line sent is terminated with a carriage return, and any line feeds are stripped from the file sent. After each line has been sent Kermit waits for a character string from the host (eg a acrriage return). If not specified, a carriage return is assumed. No KERMIT protocol is in- volved. An asterix (star) is sent to the console for every line sent, to indicate how the transfer is progressing. This is useful for send- ing files to systems that don't have a KERMIT program. During trans- mission, you may type one of these single-character commands: Control-C Cease transmission, and drop into terminal emulation mode. <CR> Re-transmit the previous line. TYPE Type a file to the console. Typing any character other than Control-C while the file is being displayed will suspend the output. Another character will resume output. A Control-C will abort the rest of the output. VERSION Show the name, edit number, and edit date of several of the modules that make up Kermit-80. 1.3. Kermit-80 Flavors Many of the systems supported use an external terminal, rather than a built-in console. Kermit may be further customized for these systems by defining (at assembly time) the terminal type to be used. If the terminal type is unknown or does not match any of the existing terminal options, the generic "CRT" op- tion may be selected. In this case, Kermit cannot do fancy screen control during file transfer; it simply types the file names, packet numbers, and mes- sages in sequence across and down the screen. This works best if you can put your micro or terminal in "autowrap" mode; otherwise the packet numbers will pile up in the rightmost column; the filenames and messages will always appear on a new line, however. If no specific terminal has been selected, Kermit can- not do VT52 emulation; it can act as a "dumb terminal" (sometimes called a "glass TTY"), or else its own built in terminal firmware provides cursor con- trol functions independent of the Kermit program. 1.3.1. Generic Kermit-80 "Generic Kermit-80" is an implementation of Kermit that should run on any 8080- compatible CP/M 2.2 system with no modification at all, or perhaps only a minor one. Unlike other Kermit-80 implementations, it contains no system-dependent manipulation of the serial port. All I/O is done with standard CP/M BIOS calls, and I/O redirection is done using the CP/M IOBYTE function, which, ac- cording to the Digital Research CP/M Operating System Manual, is an optional feature of any particular CP/M implementation. If your system does not provide the IOBYTE function, Generic Kermit-80 will not work; furthermore, not all sys- tems that implement IOBYTE do so in the same way. The SET PORT command may be used to select the devices to be used for input and output. Table 1-1 lists the options to the SET PORT command and their effects. ----------------------------------------------------------------------- SET PORT xxx input from output to CRT CRT: CRT: PTR PTR: PTP: TTY TTY: TTY: UC1 UC1: UC1: UR1 UR1: UP1: UR2 UR2: UP2: Table 1-1: Kermit-80 SET PORT Options ----------------------------------------------------------------------- The default is SET PORT PTR. In all cases, the console (CON:) and list (LST:) devices used are those selected when Kermit is started. The reason all Kermit-80 implementations aren't generic is that a good deal of speed is sacrificed by getting all services from the operating system. While a specific implementation of Kermit-80 may be able to operate at 4800, 9600, or even 56 Kilo baud, generic Kermit will fail to work on some systems at speeds in excess of 1200 baud. In addition, many features of Kermit require more specific knowledge of the hardware involved. Generic Kermit cannot send a BREAK signal, or change the baud rate, for example. 1.3.2. CP/M 3 Kermit CP/M-3 Kermit (also known as CP/M-Plus Kermit) is a version of generic Kermit-80, and should run on most CP/M-3 (CP/M-Plus) systems. It uses the auxilliary port (AUX:) to communicate to the remote Kermit. The SET BAUD and SET PORT commands are not supported; nor can a BREAK be sent. Like generic Kermit-80, a terminal may be selected at assembly time. 1.3.3. System-Specific Versions There are also many versions of Kermit-80 tailored to specific systems. Most of these operate uniformly, but some of them take advantage (or suffer limitations) of the specific system. Here are some of the special features for particular systems: Amstrad: -- Two versions: PCW 8256 The PCW 8256/8512 with the serial inerafce attached. CPC 6128 The 664 with add on memory and 6128 are both supported. Both systems must run CP/M Plus, so the 664 will need an add on RAM pack and CP/M upgrade. A high speed transfer rate of 38k baud can be used between Amstrad computers. ACCESS: Access Matrix computer using port J5. Supports SET BAUD-RATE for rates of 300-9600 baud. Apple II -- four variations: APMMDM: Apple with Z80 Softcard and Micromodem II in slot 2 Dialout capability provided in connect command; user is prompted for phone number if car- rier is not present. During connect mode, ^]D drops carrier. BYE com- mand also causes carrier to be dropped. AP6551: Apple with Z80 Softcard, and one of several 6551-based communication cards; the slot number is a compile-time parameter (default is slot 2). SET BAUD-RATE supported; speeds are 110-19200 baud. APCPS: Apple with Z80 Softcard and CP Multi-Function Card. The slot number is again a compile-time parameter. SET BAUD-RATE is supported for baud rates from 50 baud to 19200 baud. AP6850: Apple II with Z80 Softcard and a 6850-based USART in slot 2-the slot being a compile-time parameter. SET BAUD-RATE is not supported. BBC: Acorn Computers BBC Computer with Acorn Z80 second processor running CP/M-80. Supports SET BAUD-RATE and can send breaks. BigBoard II: Uses serial port A. To use port B, change mnport, mnprts, and baudrt and reassemble. Can generate BREAK. SET BAUD-RATE supported; speeds are 300-38400 baud. Cifer: Originally coded for Cifer 1886 using the VL: port set as TTYI: and TTYO: but works successfully on 18xx and 28xx series machines. There are now two versions, each with two variations: Either running CP/M Version 2.2 or 3.0, and either using the VL: or AUX: ports. The VL: port version can only use seven bits of data, so parity prefixing is required for binary file transfers. This restriction is removed by using the AUX: port. For those interested, the problem is due to the interprocessor link between the video and CPU (!) boards. The VL: port is on the video board, and the AUX: port on the CPU board, and the inter processor link can only transfer seven bits of data. Supports SET BAUD-RATE, and can generate breaks on some models with a BREAK key. Comart: Comart Communicator-Similar to Northstar equipment. Can generate BREAK. Compupro: Based on Kermit 3.x, and has been merged into V4.09 CPT-85xx word processors: Can generate BREAK. SET BAUD-RATE supported; speeds are 50-9600 baud. Cromemco: Cromemco computers with TU-ART card. Supports SET BAUD-RATE (110-9600 baud). DEC DECmate II word processor (with Z80 card): Can generate BREAK. DEC VT180 (Robin): Three output ports, referred to as COMMUNICATIONS, GENERAL, and PRINTER. Can generate BREAK. Digicomp Delphi 100: SET BAUD-RATE supported; speeds are 50-19200 baud. Discovery: Action Computer Enterprises "Discovery" Multi-user Computer. Uses Port B on an 83U user board. Supports SET BAUD-RATE for 50-19200 baud. Can generate BREAK. Epson: Epson PX-8 with LCD display. Although it is quite different in displaying of Packet Information, it works as any other CP/M-80 Kermit. Supports SET BAUD-RATE and can generate BREAK. Generic Kermit: Two versions, one for CP/M version 2.2 and version 3. These systems use IOBYTE flipping (V2.2) and the AUX: device to communicate to the serial line. You may have to SET PORT xxx before the version 2.2 will work, as Kermit needs to know what device is the serial line. Genie: Eaca Video Genie. Heath: Three Versions: H8QUAD for Heath-8 systems with the quad io board. This system has been derived from V3.x code. Note that this version will not run "as is" on H89 systems. H89 For Heath-89 machines suports baud rates from 50 to 56,000 baud. Z100 For Z-100 running CP/M-85. This version does not support setting of baud rates. Intertec Superbrain: Two Versions: BRAINA For superbrain using AUX port. Breaks and SET BAUD both supported BRAINM As above, but using the MAIN port. Ithaca: Ithaca Intersystems based computer using the VIO card for all IO to the outside world. The system is strictly speaking a home-brew variant of the Ithaca machine, using an S100 cardcage without a front panel. It uses the Extended BIOS by EuroMicro of London. However, I see no reason for this version not running on a genuine Ithaca Intersystems machine. There are patches needed to the EuroMicro BIOS to make this version work. Kaypro: Should work on most Kaypro models, as well as some related systems (Ferguson BigBoard I, Xerox 820). For the newer Kaypros with multiple ports, Kermit uses the one labeled "serial data"; it cannot use the serial printer or internal modem ports (but it should be possible to modify the values for mnport, mnprts, and baudrt to do this). Can generate BREAK. SET BAUD-RATE supported; speeds are 50-19200 baud. Lobo: Lobo MAX-80. Supports SET BAUD-RATE and can generate BREAKS. Merlin: British Telecom Merlin M2215 (also Rair Black Box, possibly also the ICL PC?). Requires a terminal. Micromate: PMC 101 Micromate. Supports SET BAUD-RATE and can generate BREAK. Micromint: Two versions S6 The Ciarcia/Micromint sb-180 board with a 6Mhz procoessor. System re- quires a terminal. S9 As above, but with a 9Mhz processor. NCR: Decisionmate 5. Uses the 2651 and is largely the same as the Ithaca Inter- systems machine implementation. Northstar: -- There are four versions available: NORTHS: Northstar Horizon with HS10-4 board. Supports SET BAUD-RATE and SET PORT. HORIZON: Northstar Horizon using the serial ports on the Mother board. Can generate BREAK. BASICNS: Basic Northstar Horizon using the printer port. Can generate BREAK. ADVANT: Northstar Advantage. Supports SET BAUD-RATE and can generate BREAK. Traps Control-0 in the system filter. Morrow Decision I: Uses the Multi-I/O board. Port 1 is the console, port 3 is the communica- tions line. SET BAUD-RATE supported; speeds are 75-56000 baud. Morrow Micro Decision I: Nokia MicroMikko: Will not echo control-O (which locks keyboard). SET BAUD-RATE supported; speeds are 75-9600 baud. Ohio Scientific: Doesn't have screen control. Osborne 1: Uses serial line, not internal modem. Left-arrow key generates <DEL> ("delete" or "rubout" character) during connect mode. SET BAUD-RATE sup- ported; speeds are 300 and 1200 baud. Now supports multi-sector buffering. Research Machines: Two Versions: RM380ZM: 380Z and 5.25" disks supports SET BAUD.RATE RM380ZF: 380Z and 8" disks, otherwise as above. Sanyo: Sanyo MBC-1100. This version derived from Kermit V3.x ScreenTyper: Details unkown. TRS-80: Three versions: TRS80LB: TRS-80 with Lifeboat CP/M TRS80PT: TRS-80 with Pickles and Trout CP/M TRSM4: TRS-80 Model 4 with Montezuma CP/M Teletek: Teletek Systemaster. Supports SET BAUD. Telcon: TELCON ZOBRA portable computer. Torch: Torch Unicorn 5 initially, but the code runs on other Z80 based CP/N (as in Nut!) systems. It uses the BBC Computer as a "Base processor", and is similar to the BBC version. The base processors RS423 port is used rather than any built in Modem. (UK telecoms legislation effectively makes modem control software tricky business...). Two potential versions exist-one using cursor positioning codes for a MCP and CCCP ROM combination of revi- sion less than 1.00, the other version uses the additional facility MCP/CCCP versions greater than 1. Supports SET BAUD-RATE and can generate BREAKs. Note that binary files must be transferred using SET PARITY to anything other than NONE! Parity is neither generated nor checked. US Micro Sales: S-100-8 based computer. Vector Graphics: Vector Xerox: Xerox 820. Z80MU: Development Kermit on a PC running the Z80MU Z80 and CP/M 2.2 development system. Allows development of the system independent modules to be done on an IBM PC or clone. Also allows the generation of new .HEX files, that may then be KERMITed to the target system. Note: Not all the BDOS or BIOS routines are supported, so avoid "unusual" BIOS/BDOS calls. (For example, DIR from within Kermit will fail as one of the BIOS routines returning disk parameters is not supported.) 1.4. Installation of Kermit-80 Kermit-80 was written originally for the Intertec SuperBrain in lowest-common- denominator 8080 code with the standard assembler, ASM (single source module, no macros, no advanced instructions), so that it could be assembled on any CP/M-80 system (the 8080 assembler is distributed as a standard part of CP/M-80, whereas the fancier Z80 or macro assemblers are normally commercial products). It has since been modified to run on many other systems as well. Kermit-80 should be able to run on any 8080-, 8085- or Z80-based microcomputer under CP/M with appropriate minor changes to reflect the port I/O and screen control for the system (see below). The proliferation of new systems supported by Kermit-80 made the program grow so large and complicated that it had to be broken up into system-independent and system-dependent modules, as of version 4 (this was done by Charles Car- valho of ACC). Each module is composed of multiple files. This has reduced the time and disk space necessary for assembly; Kermit-80 may once again be as- sembled on a CP/M system with roughly 250Kbytes of space. The majority of the code does not need to be reassembled to support a new system. Unfortunately, it can no longer be assembled with ASM, since ASM does not support multiple in- put files. To allow it to be assembled on any CP/M system, the public-domain assembler LASM is included in the distribution kit. Kermit-80 may also be as- sembled with Microsoft's M80 (not supplied). In theory, any 8080 assembler supporting the INCLUDE directive ought to work, as well. All versions of Kermit-80 are assembled from the same set of sources, with sys- tem dependencies taken care of by assembly-time conditionals within the system- dependent module (eventually, the system-dependent module will itself be broken up into multiple files, one for each system). The most important system depen- dencies are terminal emulation (when CONNECTed to the remote host) and screen handling, which are dependent on the individual micro's escape codes (these features are table driven and easily modified for other CP/M systems), and the lowest level I/O routines for the serial communications port. The port routines are best done only with BDOS calls, but some systems do not allow this, primarily because the BDOS routines strip the parity bit during port I/O, and the parity bit is used for data when transmitting binary files. Kermit-80's I/O routines must check the port status and go elsewhere if no in- put is available; this allows for virtual terminal connection, keyboard inter- ruption of stuck transmissions, etc. On systems that fully implement I/O redirection via the optional CP/M IOBYTE facility, this may be done by switch- ing the IOBYTE definition. On others, however, IN/OUT instructions explicitly referencing the port device registers must be used. CP/M-80 KERMIT versions 3.8 and later include a "fuzzy timer" that allows a timeout to occur after an interval ranging from 5 to 20 seconds (depending upon the speed of the processor and the operating system routines) during which ex- pected input does not appear at the port. In this case, retransmission occurs automatically. In any case, you may type a carriage return during transmission to simulate a timeout when the transfer appears to be stuck. 1.4.1. Organization of Kermit-80 Kermit-80 consists of two modules, each of which is generated from multiple source files. The first module contains the system-independent code; the second module is configured for a particular system and merged with the system- independent module to produce a customized Kermit-80. The distribution kit contains: - the system-independent module, CPSKER.HEX; - the system-dependent modules, CPV*.HEX (see table 1-2 and 1-3); - the source files, CPS*.ASM and CPX*.ASM, - the public-domain CP/M assembler, LASM.*, - the public-domain CP/M load/patch utility, MLOAD.* ------------------------------------------------------------------------------- Symbol Filename System ACCESS CPVACC Access Matrix ADVANT CPVADV Northstar Advantage AP6551 CPVAPL Apple II, Z80 Softcard, 6551 ACIA in serial interface AP6850 CPVA65 Apple II, Z80 Softcard, 6850 ACIA in Serial Iiterface APMMDM CPVAPM Apple II, Z80 Softcard, Micromodem II in slot 2 APCPS CPVCPS Apple II, Z80 Softcard, with CPS multifunction card BASICNS CPVBNS Northstar Horizon (terminal required) BBC CPVBBC Acorn "BBC" computer with Acorn Z80 second processor BBII CPVBB2 BigBoard II (terminal required) BRAINM CPVBRM Intertec Superbrain using the main port BRAINA CPVBRA Intertec Superbrain using the Aux port CIFER2 CPVCIF Cifer 1886 using the VL: Serial port and CP/M V2.2 CIFER3 CPVCI3 Cifer 1886 using the VL: Serial port and CP/M V3.0 CIFER2 CPVCA2 Cifer 1886 using the AUX: Serial port and CP/M V2.2 CIFER3 CPVCA3 Cifer 1886 using the AUX: Serial port and CP/M V3.0 CMEMCO CPVCRO Cromemco with TU-ART card. Terminal required) COMART CPVCOM Comart Communicator (terminal required) COMPRO CPVPRO Compupro with Interfacer 4 (or 3). Terminal required. CPC CPVCPC Amstrad CPC 664 and 6128 and CP/M 3 CPM3 CPVCP3 "Generic": CP/M 3.0 (CP/M Plus) systems (terminal req'd) CPT85XX CPVCPT CPT-85xx wordprocessor with CP/M DELPHI CPVDEL Digicomp Delphi 100 (terminal required) DISC CPVDIS Action Computer Enterprises "Discovery" (terminal req'd) DMII CPVDM2 DECmate II with CP/M option GENER CPVGEN "Generic": CPM 2.2 systems with IOBYTE (terminal req'd) GENIE CPVGNI Video Genie H8QUAD CPVH8Q Heath-8 with Quad 8 i/o board HEATH CPVH89 Heath/Zenith H89 HORIZON CPVHOR Northstar Horizon (terminal required) KPII CPVKPR Kaypro-II (and 4; probably supports all Kaypro systems) LOBO CPVLBO Lobo Max-80 "symbol" is the symbol used to select the target system, in CPVTYP.ASM; "filename" is the name under which the module is supplied in the distribution. Table 1-2: Systems supported by Kermit-80 (Part 1) ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Symbol Filename System M2215 CPVMRL British Telecom Merlin/Rair Black Box (terminal required) MDI CPVMDI Morrow Decision I (terminal required) MIKKO CPVMIK MikroMikko MMATE CPVMM PMC 101 Micromate (terminal required) MMDI CPVUD Morrow Micro Decision I (terminal required) NCRDMV CPVDMV NCR Decision Mate V. (Terminal required?) NORTHS CPVNS Northstar Horizon with HSIO-4 card (terminal req'd) OSBRN1 CPVOSB Osborne 1 OSI CPVOSI Ohio Scientific PCI2651 CPVPCI Ithaca Intersystems with VI0 card (terminal required) PCW CPVPCW Amstrad PCW 8256/8512 with serial interface PX8 CPVPX8 Epson PX-8 RM380ZM CPVRMM Research Machines 380Z with MDS (5.25" discs) RM380ZF CPVRMF Research Machines 380Z with FDS (8" discs) ROBIN CPVROB DEC VT180 S1008 CPVUSM US Microsales S-100-8 (terminal required) SANYO CPVSAN Sanyo MBC-1100 SB6 CPVSB6 Micromint SB-180 with 6Mhz CPU (terminal required) SB9 CPVSB9 Micromint SB-180 with 9Mhz CPU (terminal required) SCNTPR CPVSCN Screentyper TELCON CPVTEL TELCON Zobra portable TELETEK CPVTET Teletek Systemaster TORCH CPVTRC Torch computers BBC-B with Z80 second processors TRS80LB CPVTLB TRS-80 model II with Lifeboat 2.25C CP/M Display TRS80PT CPVTPT TRS-80 model II with Pickles + Trout CP/M Display TRSM4 CPVTM4 TRS-80 model IV VECTOR CPVVEC Vector Graphics XER820 CPVXER Xerox 820 Z100 CPVZ00 Z-100 under CP/M-85 Z80MU CPVZ80 Z80MU development system on a PC "symbol" is the symbol used to select the target system, in CPXTYP.ASM; "filename" is the name under which the module is supplied in the distribution. Table 1-3: Systems supported by Kermit-80 (Part 2) ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Symbol Terminal type CRT Dumb terminal type. Does not do cursor addressing ADM3A Lear Seigler ADM 3A ADM22 Lear Seigler ADM 22 AM230 Ampro 230 H1500 Hazeltine 1500 SMRTVD Netronics Smartvid SOROQ Soroq IQ-120 TVI912 Televideo 912 TVI925 Televideo 925 or Freedom 100 VT52 Dec VT52 or equivalent (H19) VT100 Dec VT100 or equivalent WYSE Wyse 100 "symbol" is the symbol used to select the target system, in CPXTYP.ASM; "Terminal type" is the type of terminal "symbol" selects. Table 1-4: Terminals supported by Kermit-80 ------------------------------------------------------------------------------- 1.4.2. Downloading Kermit-80 You'll need either a pre-configured .COM file or the system-independent module, CPSKER, in binary (.COM) or hex (.HEX) format and the system-dependent overlay for your system (from Tables 1-2 and 1-3). If your system is not listed in the table, get the generic CP/M 2.2 Kermit or the generic CP/M 3 Kermit. If you already have a version of Kermit on your micro and you want to install a new version, simply use your present version to get the new files. Transfer the files to your system and skip ahead to "merging the modules". If you do not have a copy of Kermit on your micro, and you cannot borrow a Ker- mit floppy but you do have access to a mainframe computer with a copy of the Kermit-80 distribution, you should read this section. There are several ways to get Kermit from a host system to your micro. The easiest is to "download" the necessary "hex" files into your micro's memory and then save it on the disk. If you have a terminal emulator program on your micro which can save a copy of the session to disk, connect to your host, and type the necessary files. Exit from the emulator, saving the session log, and edit the session log to extract the hex files. Skip ahead to "merging the files". The following is a procedure which, though far from foolproof, should allow you to get a version of Kermit to your CP/M based micro. It depends upon the host prompt, or at least the first character of the host prompt, being some charac- ter that cannot appear in a hex file (the valid characters for hex files are the digits 0-9, the upper case letters A-F, the colon ``:'', carriage return, and line feed). As soon the prompt character is encountered, the transfer will terminate. If your host does not issue a prompt that will accommodate this scheme, you can achieve the same effect by adding an atsign ``@'' to the very end of the hex file before sending it from the host. The program below looks for an atsign (the normal DEC-20 prompt, hex 40). DECSYSTEM-10 users would look for a dot, hex 2E; VAX/VMS or UNIX users would look for a dollar sign, hex 24; UNIX C-Shell users would look for a percent sign, hex 26. 1. For CP/M 2.2 systems, connect to a floppy disk with plenty of free space. Run DDT and type in the following (the comments should not be typed in; they are there just to tell you what's happening): (Note that this wont work for CP/M Plus or 3.0 systems!) ---------------------------------------------------------------- -a100 ;Begin assembling code at 100 0100 LXI H,2FE ;Where to store in memory 0103 SHLD 200 ;Keep pointer there 0106 MVI E,D ;Get a CR 0108 MVI C,4 ;Output to PUNCH (send to HOST) 010A CALL 5 010D MVI C,3 ;Input from READER (read from HOST) 010F CALL 5 0112 ANI 7F ;Strip parity bit 0114 PUSH PSW ;Save a and flags 0115 MOV E,A ;Move char to E for echo 0116 MVI C,2 ;Output to screen 0118 CALL 5 011B POP PSW ;Restore A and flags 011C CPI 40 ;(or 4E,24,26,etc) System prompt? 011E JZ 127 ;Yes, have whole file in memory 0121 CALL 17A ;No, store another byte 0124 JMP 10D ;Read another byte 0127 MVI A,1A ;Get a Control-Z (CP/M EOF mark) 0129 CALL 17A ;Store it in memory 012C LXI H,300 ;Get memory pointer 012F SHLD 202 ;Store as DMA pointer 0132 LDA 201 ;Get 'HI' byte of memory pointer 0135 STA 200 ;and store it as 'LO' one 0138 XRA A 0139 STA 201 ;Zero 'HI' byte (slow *256) 013C MVI C,16 ;Make NEW file 013E LXI D,5C ;With FCB1 0141 CALL 5 0144 CALL 15E ;Write 128 bytes (sector) 0147 CALL 15E ;Write another sector 014A LXI H,FFFF ;Get a 16-bit Minus One 014D XCHG ;into DE 014E LHLD 200 ;Get 256-byte counter 0151 DAD D ;Decrement 0152 SHLD 200 ;and store back 0155 MVI A,2 ;Check if 0157 CMP L ; 256-byte counter down to offset 0158 JZ 183 ;Yes, we're done 015B JMP 144 ;Keep writing.. 015E LHLD 202 ;Get file-pointer 0161 XCHG ;into DE 0162 MVI C,1A ;Set DMA-address 0164 CALL 5 0167 MVI C,15 ;Write sector (128 bytes) 0169 LXI D,5C ;using FCB1 016C CALL 5 016F LHLD 202 ;Get file-pointer 0172 LXI D,80 ;128-bytes 0175 DAD D ;added to file-pointer 0176 SHLD 202 ;and save 0179 RET ;and return 017A LHLD 200 ;Get Memory-pointer 017D MOV M,A ;Store character 017E INX H ;Increment Pointer 017F SHLD 200 ;and save 0182 RET ;and return 0183 MVI C,10 ;CLOSE file 0185 LXI D,5C ;using FCB1 0188 CALL 5 018B JMP 0 ;Force WARM BOOT 0179 -^C ;(Type Control-C) Return to CP/M A>SAVE 1 FETCH.COM ;Save program, we need to run it twice. Figure 1-1: Bootstrap program for Kermit-80 and CP/M Version 2.2 ---------------------------------------------------------------- Alternatively, an assembler source file for this program is dis- tributed with CP/M Kermit as CPKFET.ASM. You might prefer to type the assembler version in and assemble and load it (ASM CPKFET, LOAD CPKFET, or MASM CPKFET, MLOAD CPKFET), to let the assembler and loader catch any typing errors. 2. Connect to your host using a terminal or a terminal emulation program. Ensure that your host does not have your terminal in "page mode" (does not pause at the end of each screenful). 3. Tell the host to display the first hex file (the system-independent module) at your terminal, e.g. give a command like TYPE CPSKER.HEX, without a terminating carriage return. 4. Return to your micro by switching the cable from the terminal to the micro, or by terminating the micro's terminal program. 5. Make sure your IOBYTE is set so that RDR: and PUN: correspond to the I/O port that is connected to the host (this would normally be the case unless you have done something special to change things). 6. Load the program you entered in the first step with DDT, and use it to capture the first hex file: DDT FETCH.COM -icpsker.hex ;Setup FCB for file CPSKER.HEX -g100,179 ;Execute the program. Now there should be a file CPSKER.HEX on your connected disk. 7. Return to the host, and tell it to display the second hex file (the system-dependent module for your configuration). Again, do not type the terminating carraige return. 8. Return to your micro, and run the capture program again: DDT FETCH.COM -icpxovl.hex ;Setup FCB to create CPXOVL.HEX -g100,179 ;Execute the program. Now there should be a file CPXOVL.HEX on your connected disk. Replace CPXOVL.HEX in this example with the appropriate overlay file for your system. Merging the files: 1. For purposes of illustration, we will assume the system-dependent overlay is called "cpxovl.hex". The two hex files may be combined with MLOAD or DDT. If you already have a running Kermit, you can transfer MLOAD.HEX to your system and create MLOAD.COM by running LOAD. If you're bootstrapping Kermit, you could transfer MLOAD.HEX to your system the same way you got the other two .HEX files, but it's probably simpler to use DDT to get Kermit running, and get MLOAD later if you need it. 2. Using MLOAD, the two pieces may be easily merged: A>mload kermit49=cpsker,cpxovl [some messages about program size, etc.] A> 3. If you don't have MLOAD running, it's a bit more complex: A>ddt cpsker.hex NEXT PC 3500 0100 -icpxovl.hex -r NEXT PC xxxx 0000 -^C A>save dd kermit49.com The page count ("dd") used in the SAVE command is calculated from the last address ("xxxx") given by DDT in response to the R command: drop the last two digits and add 1 if they were not zero, then con- vert from hexadecimal (base 16) to decimal (base 10): 684F becomes 69 hex, which is 105 decimal (5 times 16 plus 9) -- but 6700 becomes 67 hex, or 103 decimal (consult an introductory computing book if you don't understand number base conversion). 4. If you are using the Z80MU CP/M and Z80 development toolkit on an IBM PC or clone, then follow the same instructions as for a genuine CP/M system. When you have loaded your file, you will have to ship the .COM or two .HEX files to the target CP/M system. (Possibly using a previous issue of Kermit?) 5. Note that CP/M hex files have checksums on each line. If there were any transmission errors during the downloading process, MLOAD or DDT will notice a bad checksum and will report an error (something like "Illegal Format"). If you get any errors during loading, either fix the hex file locally with an editor, or repeat the transfer. You now should have a running version of Kermit-80, called KERMIT49.COM. Test your new Kermit by running it. If it gives you a prompt, it might be OK. (don't delete your old one yet...). Instead of a prompt, you could get one of two messages indicating that the configuration information is invalid: ?Kermit has not been configured for a target system or ?Consistency check on configuration failed Of course, neither of these messages should appear if you're building Kermit from the distribution kit. The first message indicates that the overlay was not found where the system-independent module expected to find it, probably be- cause the overlay address is incorrect; the second indicates that the version of CPXLNK used in the system-dependent module is incompatible with the system- independent module. Once you are satisfied that KERMIT40 works correctly, you should rename your old KERMIT.COM to something else, like OKERMIT.COM, and rename KERMIT40.COM to KERMIT.COM. 1.4.3. Assembling Kermit-80 from the sources Kermit-80 is built in two pieces from the following files: The system-independent files: CPSKER.ASM header file CPSDEF.ASM definitions for both KERMIT and KERSYS CPSMIT.ASM initialization, main loop, miscellaneous commands (BYE, EXIT, LOG, SET, SHOW, STATUS, and VERSION) CPSCOM.ASM second part of commands, status and set file CPSPK1.ASM part 1 of the KERMIT protocol handler (SEND, RECEIVE, LOGOUT,and FINISH commands) CPSPK2.ASM part 2 of the KERMIT protocol handler CPSREM.ASM REMOTE routines (FINISH, BYE and LOGOUT in CPXPK*.ASM) CPSSER.ASM SERVER routines (for the future) CPSTT.ASM the transparent commands (TRANSMIT, CONNECT) CPSCPM.ASM CP/M commands (DIR, ERA, USER, TYPE, PRINT, COPY) CPSWLD.ASM the wildcard handler CPSCMD.ASM the command parser CPSUTL.ASM utility routines and data CPSDAT.ASM data space and the overlay definitions CPXLNK.ASM linkage area description The system-dependent files: CPXTYP.ASM system selection CPXLNK.ASM system overlay specification and jump table CPXCOM.ASM common routines for all systems CPXSWT.ASM system selector or switcher One of: CPXSYS.ASM family file for some system-specific code CPXTOR.ASM family file for Torch, Superbrain, PCI2651 etc CPXNOR.ASM family file for Northstar and Comart machines CPXMRL.ASM family file for British Telecom merlin/Rair Black Box CPXSB.ASM family file for Micromint SB-180 systems CPXCIF.ASM family file for Cifer systems CPXHEA.ASM family file for Heath/Zenith systems CPXAPP.ASM family file for Apple II systems CPXPCW.ASM family file for Amstrad PCW 8256/8512 machines CPXBBI.ASM family file for BigBoard, Kaypro and Xerox 820 systems CPXSYO.ASM family file for Sanyo MBS-1100 systems CPXTM4.ASM family file for Tandy Model 4 with CP/M systems CPXGNI.ASM family file for Video Genie systems CPXPRO.ASM family file for Compupro systems CPXZ80.ASM family file for the Z80MU development system and if you use a terminal, CPXVDU.ASM display codes for VDUs etc. Not always required The system-independent module contains all of the system-independent files ex- cept for CPXLNK.ASM, which is assembled into the system-dependent module to provide the structures needed to connect the two modules. As distributed, the system-independent module is named CPSKER.HEX. If you have a copy of CPSKER.HEX, you do not need to reassemble the system-independent module to con- figure Kermit for your system. The system-dependent module consists of CPXTYP.ASM, CPSDEF.ASM, CPXLNK.ASM, CPXSWT.ASM, CPSCOM.ASM, one of the family files CPXSYS.ASM, CPXTOR.ASM, CPXMRL.ASM, CPXSB.ASM, CPXCIF.ASM, CPXHEA.ASM, CPXBBI.ASM, CPXTM4.ASM, CPXGNI.ASM, CPXNOR.ASM, CPXAPP.ASM, CPXPCW.ASM, or CPXPRO.ASM, and possibly CPXVDU.ASM, if your system uses a terminal for the console. One copy of the system-dependent module is supplied already assembled for each supported sys- tem; the filename may be obtained from tables 1-2 and 1-3. If a terminal is required for a system, a CRT (glass TTY device) has been selected. After assembling the two pieces separately, they are combined with DDT or MLOAD into a system-specific Kermit. If you want to rebuild the system-independent module, the only change you may need to make is to select the assembler to be used, in CPSKER.ASM. Define one of MAC80, M80, or LASM to TRUE to select it as the assembler; the others should be defined FALSE. Assuming you have the Microsoft Macro Assembler package (M80/L80), you'll need to do the following: A>m80 cpsker=cpsker.asm A>l80 /p:100,cpsker,cpsker/n/e This will produce CPSKER.COM. If you are using LASM instead, do this: A>lasm cpsker LASM will generate CPSKER.HEX and CPSKER.PRN. LASM allows options to be specified in the same way as the standard assembler, ASM, so the command A>lasm cpsker.abz will read the source files from drive A, send the .HEX file to drive B, and suppress the listing file. If you are using the Z80MU development system on an IBM PC or clone, then as- semble your files using either LASM and MLOAD or M80 and L80, as if you were using a genuine CP/M-80 system. Note that you will still have the problem of transferring your assembled files to the target CP/M system. If you want to generate a system-dependent overlay for a particular system, or want to change the terminal supported, you'll need to check three areas in CPXTYP.ASM: First, the overlay start ADDRESS. The symbol "ovladr" is EQUated to the ad- dress of "LNKFLG" in the system-independent module, as the starting address of the overlay (6000H for version 4.09). You'll need to know this value if you're building the overlay with M80/L80. You won't normally need to change this value. Second, the assembler being used. Again, define one of MAC80, M80, and LASM to be TRUE to select it, and define the others to be FALSE. The two modules (system-independent and system-dependent) do not need to be built with the same assembler. Third, the system configuration. Locate your system in tables 1-2 and 1-3, then define the appropriate symbol TRUE, and the rest FALSE. If the system comes with a builtin console terminal, define all the terminal switches FALSE. If the system uses an external terminal as the console, locate the terminal in table 1-5 and define the appropriate symbol TRUE, and the remainder FALSE. If the terminal is not listed in table 1-5, use the CRT switch; in this case, VT52 emulation is not supported. In addition, there are a few general and system-specific symbols which may be altered to fit your system: APSLOT For Apple with 6551 ACIA, defines the slot number of the serial card CPUSPD Processor speed in units of 100KHz (currently used only for bbII and kpII for timing loops) TAC For users connecting through ARPAnet TACs: set to TRUE if you wish the default TACTRAP status to be ON. (This may be overrid- den with the SET TACTRAP command). If you're not connecting through a TAC, set tac to FALSE and ignore tacval. TACVAL For ARPANET TAC users: defines the default TAC intercept character (may be overridden with the SET TACTRAP command). If you are just assembling an existing configuration, you'll need to edit CPXTYP.ASM only. If you are adding support for a new system, you should not modify CPSDEF.ASM or CPXLNK.ASM; if you do, you'll have to change the system- independent module also. Eventually, CPXSYS.ASM will be split into separate files, each of which will generate one or more related systems. When this hap- pens, you'll want to pick the one closest to your system to use as a starting point. After editing CPXTYP.ASM as necessary, assemble and link the overlay as fol- lows: - With M80 (where "xxxx" is the hex value of ovladr from CPXLNK.ASM): A>m80 cpxtyp=cpxtyp.asm A>l80 /p:xxxx,cpxtyp,cpxtyp/n/x/e - With LASM: A>lasm cpxtyp With an IBM PC or clone using the Z80MU softwrae, follow the instructions as if you were using a real CP/M system. The overlay (CPXTYP.HEX) may then be merged with the system-independent module as described above (creating a runnable Kermit from the distribution kit). If you are using the Z80MU development system on a PC, and already have a run- ning Kermit-80 v3.9 or later, you can merge the two .HEX files into a .COM file with LINK80 (TOPS 10/20), MLOAD (Z80MU), L80 (Z80MU), and transfer the new .COM file to your micro with Kermit: - Z80MU on a PC and MLOAD: @MLOAD KERNEW=CPSKER,CPXTYP - Z80MU on a PC and C80: @L80 /P:xxxx,CPXTYP,CPXTYP/N/X/E producing KERNEW.COM. ------------------------------------------------------------------------------- Symbol Terminal description crt Basic CRT, no cursor positioning adm3a ADM3A Display or lookalike adm22 ADM22 Display or lookalike am230 Ampro 230 h1500 Hazeltine 1500 smrtvd Netronics Smartvid-80 soroq Soroq IQ-120 tvi912 TVI 912 tvi925 TVI 925, Freedom 100 vt52 VT 52 or VT52 emulator such as Heath H19, H29, etc. vt100 VT 100 or emulator (most ANSI terminals should work) wyse Wyse 100 Table 1-5: Terminals known to Kermit-80 ------------------------------------------------------------------------------- 1.5. Adding Support For A New System Kermit-80 is built from a common set of source files; the system-dependent module makes heavy use of conditional assembly (this complication will be removed in future releases). The system dependencies arise from attempts to answer some questions: 1. What kind of terminal is to be supported? For many micros, the console is an integral part of the system, but others can use an external terminal. In either case, the commands to manipulate the screen (position the cursor, erase the screen, etc) must be defined. 2. How is the serial line accessed? For systems supporting the IOBYTE function, this is straightforward; the symbol "IOBYT" is defined TRUE. If the serial line is accessed with IN and OUT instructions, it may be possible to use the simple I/O routines provided. In this case, the symbol "INOUT" is defined TRUE, the MNPORT and MNPRTS are defined to be the data and control addresses, respectively, and bit masks for testing for "input data available" and "output buffer empty" must be defined. If the inter- face is strange, leave IOBYT and INOUT set to FALSE, and provide the I/O routines. 3. What initialization is necessary? You may wish to set the baud rate or configure the serial line at startup. Examples for a number of devices are present. 4. What special features are to be supported? You may want to provide the capability to select one of several serial lines with the SET PORT command, or to change the speed of the serial line with the SET BAUD-RATE command. To do this, you'll need to build a command table, using the systems already supported as examples. The ability to send a BREAK signal is desirable. Again, examples for several different interfaces (ACIA, SIO, etc) are present. 5. Do you want to design an external terminal type? There is a jump entry in the overlay file to allow users to add their own termainl emulator. If you write the code for such an emulator, you must load this jump address with the address of your emulator, and SET TERMINAL EXTERNAL from within Kermit. All charac- ters will be passed to this routine during connect mode. 1.6. Notes on New Features in Kermit-80 Version 4 - Debugging aids: SET DEBUG ON will add two fields to the SEND/RECEIVE display, labelled "Spack" and "Rpack". These display the last packet sent and received. Of course, this slows down the transfer, espe- cially if the console is an external terminal. SET DEBUG OFF removes these fields. The VERSION command displays the name, edit number, and edit date of several of the modules that make up Kermit. - TAC support: ARPAnet TACs (and many other communication devices such as terminal concentrators, modems, port contention units, network PADs, etc) use a printing character (like "@") as an intercept character, to allow commands to be issued to the TAC, or modem, etc. In order to send this character to the host, it must be typed twice. The command "SET TAC CHARACTER" to Kermit enables the "TACtrap" and asks the user to specify the TAC intercept character. This character will be automatically doubled when it appears in Kermit protocol mes- sages (sent by the SEND or RECEIVE commands) or when it appears in a file being sent with the TRANSMIT command. It is not automatically doubled when typed by the user in CONNECT mode. "SET TAC ON" enables the TACtrap but does not change the TAC intercept character, which is initially "@". "SET TAC OFF" disables the TACtrap. - File buffering: Previous versions of Kermit-80 buffered only one sector (128 bytes) at a time during file transfer operations. This version buffers 16Kbytes at a time, reducing the number of times the floppy drive must be spun up and down, and increasing the effective throughput of the link. If the disk transfer rate is too slow, however, the remote Kermit may time out and retransmit packets. This will show up on the screen in the "Retries:" field; if this occurs after disk activity, you may want to increase the timeout value on the remote Kermit, SET BUFFER <new value> while in Kermit,or reas- semble Kermit with a smaller value for MAXSEC (in CPSDEF.ASM) This buffer is also used by the TRANSMIT command; the log file enabled by the LOG command is still written a sector at a time. This section is intended for people wanting to implement their own versions of Kermit-80 for computers not already defined. The system independent code communicates to routines for a specific system through a set of tables. These tables are defined in CPXLNK.ASM, and should not be modified between revisions of Kermit. If an entry is added or deleted, then the whole of Kermit-80 needs reassembling. Make sure that the changes to CPXLNK.ASM are duplicated in CPSUTL.ASM, which has the system independent equivalent of CPXLNK.ASM. The following entries/definitions apply to revision 4.09. There have been three additional entries since revision 4.05. The table is split into three sectors; The first section defines two byte "words" giving 16 bits of interface data; The second set is a set of jumps to various functions, and finally the third set a set of pure data bytes. 1.6.1. Interface Data. LNKFLG Must be first entry in overlay at overlay address. Is a two byte address giving the size of the linkage table. This is used to check for consistency of overlay's ENTSIZE Length of entry table, also used for consistency checking after the overlay. Currently 6 SYSEDT The address of a dollar-terminated string giving the overlay revision level and date. Points to a string like: CPXSYS.ASM(33) 4-JUN-1986$ FAMILY The address of a dollar-terminated string giving the Family overlay revision level and date. If the system is in CPXSYS.ASM rather than a particular Family overlay, it is simply a pointer to $ 1.6.2. Jump Table. This is split into three main sectors- 1. Input/Output routines 2. Screen formatting routines 3. other system dependent routines SELMDM Parameters None Returns None Description selects the modem port. Most systems do nothing and simply return. HL,DE and BC registers preserved. OUTMDM Parameters None Returns None Description Output the character in E register to the communications line. BC,DE,HL registers preserved. INPMDM Parameters None Returns Accumulator either 0 or character from comms line if available Description Check modem for character and if so, return it in A. HL,DE,BC registers preserved, flags and accumulator lost. FLSMDM Parameters None Returns None Description Clear any pending characters in the input buffer from the modem. No registers are preserved. SELCON Parameters None Returns None Description Select the console. This is a null subroutine for most sys- tems, but for IOBYTE systems selects the console. OUTCON Parameters Character in E Returns None Description Send the character in E to the console. Any quirks of system responding in an odd manner should be handled. No registers preserved. INPCON Parameters None Returns Zero or character in A. Description Get a character from the console or return a null if no charac- ter to be read. No registers are preserved. OUTLPT Parameters Character in E Returns None Description Send the character in E to the printer. The console is selected. Only DE registers are preserved LPTSTAT Parameters None Returns 00H or 0FFH in A register Description Test the printer to see if it is ready to receive a character to be printed. If a 00H is returned then the printer is ready to receive a character. EXTTER Parameters Character to be sent to the user supplied terminal emulator in the E register Returns None Description If the user has supplied a terminal emulator in the overlay code, EXTTER will be a JMP <non zero address>. If SET TERMINAL EXTERNAL has been set, all caharcters will be passed verbatim to this terminal emulator. If there is no external emulator, this code will never be called. The user should reset terminal conditions on initialisation of both the system and before CON- NECT. All registers should be preserved. XBDOS Parameters Any required for calling BDOS Returns Any expected from the called BDOS routine Description This is an alternative entry to BDOS. This entry will also check the printer status etc. For full details see the code for the BDOS trap in CPSUTL.ASM. 2b) CLRLIN Parameters None Returns None Description Clear the current line on the terminal CLRSPC Parameters None Returns None Description Erase the current position (after a backspace) DELCHR Parameters None Returns None Description Make delete (7FH) look like a backspace. Some systems do a backspace, space, backspace automatically others have to simu- late it CLRTOP Parameters None Returns None Description Clear the screen and place the cursor at the top LH corner SCREND Parameters None Returns None Description Place the cursor on the line for the Kermit-80 prompt after a file transfer. (Usually line 13) SCRERR Parameters None Returns None Description Move cursor to the error message field on the file transfer format screen SCRFLN Parameters None Returns None Description Move the cursor to the filename field SCRNP Parameters None Returns None Description Move the cursor to the packet count field SCRNRT Parameters None Returns None Description Move cursor to the retry count field SCRST Parameters None Returns None Description Move cursor to the status field RPPOS Parameters None Returns None Description Move to the receive packet field (debugging use) SPPOS Parameters None Returns None Description Move to the send packet field (for debugging use) 2c) SYSINIT Parameters None Returns None Description Initialize the system specific items. No registers are preserved. Any initialization is done once only when Kermit-80 is first loaded. SYSEXIT Parameters None Returns None Description Program termination. De-initialize anything in preparation for a return to CP/M SYSCON Parameters None Returns None Description Initialize anything before entering the connect state. SYSCLS Parameters None Returns None Description System dependent close routine when exiting connect state SYSINH Parameters None Returns None Description Help routine to test for any extensions to the escape menu during the connect state. If a system has any special feature it can use during connect mode, then it can be tested as <escape-character>xxx. This entry is a string for printing to the console for an <escape-character>? Often used for generat- ing breaks or controlling a modem. SYSINT Parameters None Returns None Description This is a test-and-jump on receipt of an escape sequence not understood by Kermit-80. If the character in A is not recog- nized by your version of Kermit=80, do a rskip SYSFLT Parameters Character in E Returns Character in E. Either a 00H or anything else in A Description Test the character in E. If it may not be printed to the con- sole, set A to zero. All other registers preserved. NB <XON>,<XOFF>,<DEL>,<NULL> are always rejected. SYSBYE Parameters None Returns None Description System dependent processing for the BYE command. (eg hang up the phone) SYSSPD Parameters Value from table in DE Returns None Description The system dependent code for baud rate change. DE contains the two byte value from the baud rate table. This value is also stored in "SPEED" SYSPRT Parameters Value in DE Returns None Description The system dependent code for setting the port. The parameters are passed in DE, which are obtained from the port tables SYSSCR Parameters String pointer in DE Returns None Description Setup the screen display for file transfer. The Kermit version string is pointed to by DE. If the terminal is not capable of cursor addressing (eg dumb glass TTY) then only the screen is cleared and the version string is printed. CSRPOS Parameters Row number in B, column number in C Returns None Description Move the cursor to row B, column C where B=1,C=1 is top LH corner of screen. The routine should first end a "cursor position" leading string (up to four characters) then use the parameters given to complete the versions cursor position func- tion SYSSPC Parameters None Returns K bytes free in HL Description Get the amount of free disk space on the selected disk drive. This could be in the system independent code. Automatically detects CP/M V2.2 or V3.0. No registers saved. MOVER Parameters Source Pointer in HL Destination Pointer in DE Byte count in BC Returns None Description Move (BC) bytes from (HL) to (DE) Z80 based systems do an LDIR, while 8080 systems do it as a loop. All registers destroyed PRTSTR Parameters $ terminated string pointed to by DE Returns None Description Print the string onto the console. 3) PTTAB WORD Points to VT52 equivalent escape sequences. SPDTAB WORD Address of baud-rate command table, or 0 if table does not exist SPDHLP WORD Address of baud-rate help table, or 0 if SET BAUD-RATE is not supported. PRTTAB WORD Address of port command table or 0 if SET PORT is not supported. PRTHLP WORD Address of port help table or 0 if SET PORT is not supported TIMOUT BYTE FUZZY-TIMER. Set to value suitable to your system (depends largely on CPU speed) VTFLG BYTE VT52 emulation flag. Set to 0 if terminal emulates a VT52, 01 if emulation is required, or 0FFH if emulations not possible (eg for "CRT") ESCCHR BYTE default escape character-usually control-] but some- times control-\ SPEED WORD Storage space for baud-rate. Set to 0FFFFH as baud rates are initially unknown. Note that the STATUS routine only looks at the first (least significant) byte. PORT WORD Storage space for port. Set to 0FFFFH as ports may not be implemented, and is initially unknown PRNFLG BYTE Printer copy flag-if O no copy. Anything else => copy to printer DBGFLG BYTE Debugging flag. If O then no debugging to be done. (ie writing of debugging info during a file transfer) ECOFLG BYTE Local ECHO flag (default is off) FLWFLG BYTE File warning flag. If set to 1 will not overwrite files already existing on disk with some-named files being transferred IBMFLG BYTE IBM system is the host-assume IBM file transfers etc CPMFLG BYTE Flag indicating type of CP/M files to be transferred. Default setting - DEFAULT PARITY BYTE Type of parity in use 0 = Even parity 3 = Mark parity 6 = No parity (8th bit is data) 9 = Odd parity 12 = Space parity SPSIZ BYTE Size of send packet RPSIZ BYTE Size of receive packet STIME BYTE Send timer (time-out) RTIME BYTE Receive timer (time-out) SPAD BYTE Send Padding (default=0) RPAD BYTE Receive Padding (default=0) SPADCH BYTE Send Padding character (default=NULL) RPADCH BYTE Receive Padding character (default=NULC) SEOL BYTE Send EOL character (default=CR) REOL BYTE Receive EOL character (default=CR) SQUOTE BYTE Send quote character (default=#) RQUOTE BYTE Receive quote character (default=#) CHKTYP BYTE Ascii value of checktype 31H="1"=checktype1 (6bits) 32H="2"=checktype2 (12bits) 33H="3"=CCITT checksum (CRC) Default is 31H("1") TACFLG BYTE If set to on (non zero) send the TACCHR twice. This is for ARPA TAC users, where the TAC swallows one "wakeup" character. If sent twice the TAC will pas one on and go back to normal mode. TACCHR BYTE Desired TAC character. It is ignored if TAC trapping is turned off. Value to send twice if TAC interception is set on. Default=0, but set to commercial AT if the conditional as- sembly flag TAC is set true BUFADR WORD Address of Multi-Sector buffering for I/O BUFSEC BYTE The number of bytes the big buffers can hold. Default is 1. (0=256 sectors). FFUSSY BYTE Indicates if funny characters may be used in CP/M file names (eg <>.,;?#[]) If zero, allow anything. Default is nonzero BMAX SPACE:(2bytes) Highest block number on selected disk drive BMASK SPACE:(1byte) (Records/block)-1 BSHIFTF SPACE:(1byte) Number of shifts to multiply by rec.block NNAMS SPACE:(1byte) Counter for file-names per line 1.7. Future Work Work that needs to be done in future releases includes: - Merge in support for additional CP/M-80 systems, particularly those for which support was recently added to the monolithic v3.x source. - Break up CPXSYS into discrete source files, one for each system. These source files should serve as simple models for adding support for new systems to Kermit-80 -- only the very basic screen defini- tions, flags, i/o primitives, initializations, and so forth should appear in each system-dependent file. - Addition of missing features -- compression of repeated characters during packet transmission, transmission of file attributes (particularly size, so that "percent done" can be displayed for both incoming and outbound files), advanced commands for servers (REMOTE DIRECTORY, etc), command macros and initialization files, login scripts, remote operation and server mode, etc etc. Any offers?? Index , 8080 4, 5 Append 2 ARPAnet 9 Attention Character 9 Autoreceive 2 Baud 2 BIOS 4 Block Check 2 Bootstrap 7 Break 1 Buffer size 2 Bye 2 Carriage Return 1 Case Sensitivity 2 Cntl-C 1 Cntl-X 1 Cntl-Z 1 Connect 2 Control-C 1 Control-X 1 Control-Z 1 Copy 2 CP/M 5 CP/M-80 Kermit 1 CR 1 Debug 2 Default Disk 2 Directory 2 Directory file size 2 Downloading 7 Dumb terminal 3 Eighth-Bit Prefix 3 Erase 2 Escape Character 2, 3 Exit 2 External Terminal Emulation 3 File Copying 2 File-mode 3 File-Warning 2 FINISH 2 Flow Control 3 Generic Kermit-80 4 GET 2 Help 2 IBM 3 Input 2 Intercept Character 9 Local 1 Local-Echo 3 LOG 2 Logging 3 LOGOUT 2 NAK 1 No-exit 3 Pad character 3 Parity 3 Pause 2 Port 3 Print 2 PRINTER 3 RECEIVE 2 SEND 2 SET 2 Set padding 3 Set Receive 3 Set Send 3 Set Start of packet 3 Show 3 Status 3 STRING 3 TAC 9 TacTrap 3 Take 4 Terminal emulation 3 Timeout 1, 6 TIMER 3 TRANSMIT 4 Type 4 USER 3 VERSION 4 Virtual Terminal 2 VT100 3 VT52 3 Warning 3 XON/XOFF 2 Z80 5 Table of Contents 1. CP/M-80 KERMIT 1 1.1. Summary of CP/M 1 1.2. Kermit-80 Description 1 1.3. Kermit-80 Flavors 4 1.3.1. Generic Kermit-80 4 1.3.2. CP/M 3 Kermit 4 1.3.3. System-Specific Versions 4 1.4. Installation of Kermit-80 5 1.4.1. Organization of Kermit-80 6 1.4.2. Downloading Kermit-80 7 1.4.3. Assembling Kermit-80 from the sources 8 1.5. Adding Support For A New System 9 1.6. Notes on New Features in Kermit-80 Version 4 9 1.6.1. Interface Data. 9 1.6.2. Jump Table. 9 1.7. Future Work 11 Index i List of Figures Figure 1-1: Bootstrap program for Kermit-80 and CP/M Version 2.2 7 List of Tables Table 1-1: Kermit-80 SET PORT Options 4 Table 1-2: Systems supported by Kermit-80 (Part 1) 6 Table 1-3: Systems supported by Kermit-80 (Part 2) 6 Table 1-4: Terminals supported by Kermit-80 7 Table 1-5: Terminals known to Kermit-80 9