Internet Info 1994 March/Internet Info CD-ROM (Walnut Creek) (March 1994).iso/networking/terms/kermit/c/c86ker.mss

Text File | 1988-11-07 | 20.1 KB | 424 lines

@Part(86KERMIT,root="kuser")
@string{-86version="@q<2.9>"}
@Chapter<CP/M-86 KERMIT>
@Begin<Description,Leftmargin +12,Indent -12,spread 0>
@i(Authors:)@\Bill Catchings, Columbia University; Ron Blanford, University of
Washington; Richard Garland, Columbia University.

@i(Language:)@\Digital Research ASM86

@i(Version:)@\@value(-86version)

@i(Date: )@\December 1984

@i(Documentation:)@\Frank da Cruz, Columbia
@end<Description>
@label<-k86>

This version of KERMIT is designed to support any CP/M-86 system.  So far it
supports the DEC Rainbow-100 and the NEC Advanced Personal Computer (APC).  It
is very similar to CP/M-80 and MS DOS KERMIT.

@subheading<CP/M-86 KERMIT-86 Capabilities At A Glance:>
@begin<format,leftmargin +2,above 1,below 1>
@tabclear()@tabset(3.5inches,4.0inches)
Local operation:@\Yes
Remote operation:@\No
Transfers text files:@\Yes
Transfers binary files:@\Yes
Wildcard send:@\Yes
@q<^X/^Y> interruption:@\Yes
Filename collision avoidance:@\Yes
Can time out:@\Yes
8th-bit prefixing:@\Yes
Repeat count prefixing:@\No
Alternate block checks:@\No
Terminal emulation:@\Yes, uses PC firmware (VT100)
Communication settings:@\Yes; duplex, parity
Transmit BREAK:@\Yes
IBM communication:@\Yes
Transaction logging:@\No
Session logging (raw download):@\Yes
Raw upload:@\No
Act as server:@\No
Talk to server:@\Yes; SEND, GET, FIN, BYE
Advanced commands for servers:@\No
Local file management:@\Yes
Handle file attributes:@\No
Command/init files:@\Yes
Printer control:@\No
@end<format>

@heading<CP/M-86 KERMIT Description>

@index<Timeout>
Since Kermit-86 runs on a standalone micro, it is always in control of the
screen -- it is always @i<local>@index<Local>.  Thus, it always keeps the
screen updated with the file name and the packet number, whether sending or
receiving.  Kermit-86 is capable of timing out an input request, and can thus
break deadlocks automatically.  In most cases, however, this is not desirable
because the KERMIT on the other side is most likely better able to handle the
timeouts; therefore, Kermit-86's timer is normally not used.

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 long
while) you can type carriage return to have the micro do what it would have
done on a @Index[Timeout] timeout, namely NAK@Index[NAK] the expected packet to
cause to foreign 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 intervention.

File transfers may be interrupted in several ways.
@begin<description>
Control-C@\This will return you to Kermit-86 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-86 will go on to the next one.
When receiving a file, KERMIT-86 will send a signal to the remote KERMIT to
stop sending this file.  If the remote KERMIT understands this signal (not all
implementations of KERMIT do), it will comply, otherwise the file will keep
coming.  In either 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 Returns@\If you type carriage return repeatedly Kermit-86 will retry
the current packet up to its retry limit (somewhere between 5 and 16 times) and
then, if no valid response was received, return to Kermit-86 command level.
@end<description>

When KERMIT-86 is started, it looks for the file @q[KERMIT.INI].  If found, it
executes KERMIT-86 commands from it before prompting you for commands.
The KERMIT-86 prompt looks like this:
@example(Kermit-86 B3>)
in which "B" is your current default disk and "3" is the current default user
number.

@Section<Kermit-86 Commands>

KERMIT-86 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-86 will sound a beep and allow you to continue from that
point.
@begin<description,leftmargin +8,indent -8>
@Index[Virtual Terminal]@Index[Escape Character]@Index[Connect]
CONNECT@\Establish a "virtual terminal" connection to any host that may be
connected to the serial port, i.e.@ pass all typein to the serial port and
display all input from the serial port on the screen, using the system's own
built-@|in support for ANSI (VT100-@|like) screen control.  When you issue the
CONNECT command, the PC will print a message telling you how to get back by
typing an an escape sequence, an uncommonly-@|used control character, normally
CTRL-backslash, followed by a single letter "command".
 @begin<description,spread 0,leftmargin +4, indent -4>
C@\Close Connection, return to @q(Kermit-86>) command level.

@q<?>@\List available single-character commands.

B@\Send a BREAK signal.

Q@\Quit logging the remote session.

R@\Resume logging the remote session.

L@\Toggle logging.

@q<^\>@\(or whatever - a second copy of the escape character) Send the
escape character itself to the remote host.
 @end<description>

@Index[SEND]SEND @i<filespec>@\Send file(s) specified by @i<filespec> to
the remote Kermit, using the prevailing file mode (ASCII or BINARY; see SET).
The @i<filespec> may contain CP/M wildcards.

@Index[RECEIVE]@Index[File-Warning]
RECEIVE@\Receive file(s) from the remote
Kermit.  Store them under the names provided in the file headers supplied by
the remote host.  If the names aren't legal, use as many legal characters from
the name as possible (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 "@q<&>" characters to the name.
You may also provide an optional file name in the RECEIVE command; if you do,
the incoming file will be stored under the name you specify.  If more than one
file arrives, only the first will be stored under the given name, unless you
included wildcard characters in the RECEIVE filespec; in that case, the
filespec will be used as a mask for incoming filenames.  For instance, you
told the remote Kermit to send @q<*.ASM>, you could tell KERMIT-86 to
"receive @q<*.A86>", thereby changing the filetype of all the incoming files.

@Index<GET>GET @i<filespec>@\When Kermit-86 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 example: @q[@w<get hlp:k*.hlp>]

BYE@\When talking to a remote Kermit Server, this command shuts down
the server and logs it out, and also exits from Kermit-86 to CP/M command
level.@Index[BYE]

@Index[LOGOUT]LOGOUT@\Like BYE, but leaves you at Kermit-86 command level.

@Index[FINISH]FINISH@\Like LOGOUT, but shuts down the remote server without
logging it out.  Leaves you at Kermit-86 command level; a subsequent CONNECT
command should put you back at host system command level.

EXIT@\Exit from KERMIT-86 back to CP/M.

QUIT@\Synonym for EXIT.

@Index[SET]SET @i<parameter> [@i<value>]@\Set the specified parameter to
the specified value.  Possible settings:
@begin<description,leftmargin +8,indent -8>
@Index[Baud]BAUD@\Change the baud rate of the communications port.  This
command only works on some systems, and its actual operation can vary from
system to system.  Type SET BAUD followed by a question mark, and follow the
directions.  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-86.

@Index[Debugging]DEBUG@\ON or OFF.  If ON, displays incoming and outbound
packets during file transfer.  OFF by default.

DEFAULT-DISK @i<disk/user>@\Specify default disk and user number for subsequent
file reception and transmission.  The specification following the command must
be in one of the following forms:
@begin<description, leftmargin +8, indent -4,spread 0>
@q<d:>@\= go to drive d (A through P) without changing user

@q<u:>@\= go to user u (0 through 15) without changing drive

@q<du:>@\= go to drive d and user u

@q<:>@\= go to the defaults when Kermit was loaded
@end<description>
Whenever a drive is specified, even if it is the same as the current
default drive, the drive is logged in so that disks can be swapped
without exiting Kermit to type control-C.  Kermit restores the original
drive and user upon termination.

@Index[Escape Character]ESCAPE@\Change the escape character for
virtual terminal connections.  Select a character in the control range that you
will not be likely to need at the remote host; type the new character
literally.  Certain characters, like Control-X, cannot be specified.

FILE-TYPE@\Tells KERMIT-86 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 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).  If binary transmission is used on a text
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,
the entire file will not be sent if it happens to contain any data bytes that
correspond to Control-Z.  ASCII is the default.

@Index[Flow Control]FLOW-CONTROL@\Select the desired type of flow control to
be used on the communication line.  The choices are NONE and XON/XOFF.
XON/XOFF is the default.  If the remote system is not full duplex or cannot do
XON/XOFF, you should use NONE.

@Index[IBM]IBM ON (or OFF)@\Allow the transfer of files to and from an IBM
mainframe computer.  This makes Kermit-86 wait for the IBM turnaround character
(XON), ignore parity on input, add appropriate parity to output, and use local
echoing during CONNECT.  As distributed, KERMIT-86 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
timeout facility automatically, as if you had typed "SET TIMER ON".

@Index[Local-Echo]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.

@Index[LOG]LOG@\Specify a log file on the current CP/M disk into which to
record incoming characters during CONNECT.  If the remote host can do XON/XOFF,
then the log file will normally capture every character shown on the screen.
When connected to the remote system, several single-@|character arguments to
the connect escape character can be used to control logging -- Q (quit), R
(resume), L (toggle).  If you use R or L during connect without having
previously specified a log file name, then @q[KERMIT.LOG] is used.  An open log
is closed when you escape back to the PC.

@Index[Parity]PARITY@\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 connection and file transfer.
If you set parity to anything other than NONE, Kermit-86 will attempt to use
@Index<Eighth-Bit Prefix>
"8th bit prefixing" to transfer binary files.  If the other KERMIT is also
capable of 8th bit prefixing, then binary files can be transferred
successfully; if not, the 8th bit of each data byte will be lost (you will see
a warning on your screen if this happens).

PORT@\Allows you to switch between different communication ports on the PC.
This command is not available on all systems.

@Index[TIMER]TIMER ON (or OFF)@\Enable or disable the timeout facility.  The
timer is off by default, because in the normal case KERMIT-86 is communicating
with a mainframe KERMIT that has its own timer.  Mainframe KERMIT timers tend
to be more precise or adaptable to changing conditions.  You should SET TIMER
ON if you are communicating with another KERMIT that does not have a timer.
You should SET TIMER OFF if you are communicating over a network with long
delays.

@Index[Warning]WARNING ON (or OFF)@\Warn user of filename conflicts when
receiving files from remote host, and attempt to generate a unique name by
adding "@q<&>" characters to the given name.  OFF by default.
@end<description>

@Index[SHOW]SHOW@\Show the current settings of the SET parameters.

@Index[TAKE]TAKE@\Take KERMIT-86 commands from the specified file.  The file
should not contain any TAKE commands; nested command files do not work.

LOCAL@\This is a prefix for local file management commands, to distinguish them
from remote file management commands (which aren't implemented yet).  The LOCAL
prefix is optional; if left off, the commands will be performed locally.
@begin<description>
SPACE@\Show how much space is used and remaining on the current disk.

DIRECTORY@\Provide a directory listing for the current disk, showing the name
and size of each file.  A filespec may be given to select only a certain file
or wildcard file group.

DELETE@\Delete the specified files from the current disk.

TYPE@\A wildcard filespec is accepted and files displayed
alphabetically.  The display is paged in Unix fashion with "@q(--more--)"
displayed on the last line.  Typein options at that point can be
obtained by hitting a '@q(?)'.
@end<description>
@end<description>

@Section<Installation:>

CP/M-86 KERMIT is broken up into several source modules:

@begin<example>
    C86CMD.A86          @r(Command parser)
    C86FIL.A86          @r(File handler)
    C86Xxx.A86          @r(System Dependent I/O)
    C86KER.A86          @r(Main Program)
    C86PRO.A86          @r(Protocol Module)
    C86TRM.A86          @r(Terminal Emulation)
    C86UTL.A86          @r(Utilities)
@end<example>

The main program module, @q<C86KER.A86>, contains INCLUDE directives for the
other files.  The C86Xxx module is stored with "xx" replaced by codes denoting
the machine for which the program is being built -- RB for Rainbow, AP for NEC
APC, etc.  The program may be built on the CP/M-86 system by obtaining
all the source files listed above, storing them on the current disk with the
names indicated, renaming the appropriate @q[C86Xxx.A86] file to be
@q[C86XXX.A86], and then doing:
@begin<example>
    ASM86 C86KER $PZ  @r<(takes about 6 minutes on the Rainbow)>
    GENCMD C86KER     @r<(takes less than a minute)>
@end<example>
and, if desired,
@begin<example>
    REN KERMIT.CMD=C86KER.CMD
@end<example>

@Section[DEC Rainbow 100 Support]

@Index[DEC Rainbow]@Index[Rainbow 100]
Kermit-86 runs on the DEC Rainbow 100 or 100+ under CP/M-86/80, version 1 or 2,
on the 8088 side.  It uses the built-in firmware to emulate a VT102 ANSI
terminal during CONNECT, and runs well at speeds up to 9600 baud.

You should be able to download the program using the old KERMIT on the Z80 side
(Rainbow Kermit, VT180 Kermit, or generic CP/M-80 Kermit will do the job, but
only under DEC CP/M-86/80 version 1.0), or an earlier version of Kermit-86.

If you don't have an earlier version of KERMIT, then follow the directions for
installing KERMIT-80 (yes, KERMIT-80) in the KERMIT-80 section of the @i<Kermit
User Guide>, but send the Kermit-86 hex file instead.  This works because the
Rainbow can run CP/M-80 programs like DDT.

Another way to get Kermit onto your Rainbow for the first time would be from
a DEC VT-180 diskette.  A VT-180 can use its own Kermit to load Rainbow Kermit
onto its disk, which can then be read directly by a Rainbow.  Also, note that
VT-180 Kermit-80 can actually run on the Rainbow on the Z80 side under DEC
CP/M-86/80 version 1 (but not version 2 or higher), at speeds of 1800 baud or
lower.

@Section[NEC Advanced Personal Computer Support]

(Contributed by Ron Blanford, University of Washington)

@Index[NEC Advanced Personal Computer]@Index[APC]
Currently only the standard serial port is supported, and not the H14 auxiliary
port.  The SET PORT command is not implemented.

While in Kermit's terminal emulation mode, local commands are initiated by a
two-@|character sequence consisting of the "escape character" followed by one
other character identifying the command.  (Make the second character a '?' to
see a list of the valid commands.)  As distributed, the standard Kermit-86
uses the control-@|backslash character as the escape character in terminal
mode.  The trouble is that the CP/M-86 BIOS in the APC ignores a keyboard entry
of Control-\ (i.e. holding down the CTRL key while striking the '\' key),
making it difficult (impossible) to use this method to get out of terminal
mode.

One solution is to perform a "SET ESCAPE ^" command before entering terminal
mode to change the escape character to a caret (or any other character the
APC keyboard will generate).  This command could be placed in your
@q[KERMIT.INI] file for automatic execution every time Kermit is started.

The simpler solution is to realize that the character code for a Control-\ is
a hexadecimal 1C, and that this is the code generated by the INS key on the
numeric keypad.  Once you can remember that every reference to Control-\
should be interpreted as a reference to the INS key, this is actually easier
to use than the two-key Control-\ sequence.

In the standard CP/M-86 BIOS, the unshifted DEL key generates a Control-X
character (hexadecimal 18).  This is the CP/M command to erase the current
input line, and is very useful for local processing.  Most mainframes do not
use the Control-X character at all, so it becomes much less useful during
terminal emulation.  The DEL character (hexadecimal 7F), on the other hand,
is often used by mainframes and can only be generated on the APC by holding
down the SHIFT key while striking the DEL key (this capability is not mentioned
anywhere in the documentation).

Because the Control-X character is so seldom used while the DEL character is
commonly used, the initialization procedure in Kermit-86 modifies the CP/M-86
BIOS so that the DEL key generates the DEL character whether shifted or not.
Control-X can still be generated if necessary by holding down the CTRL key
while striking the 'X' key.  The CP/M-86 BIOS is returned to its original state
when Kermit terminates.

The APC uses escape sequences which have been standardized by the American
National Standards Institute (ANSI) to control cursor movement, screen erasing,
and character attribute manipulation.  Perhaps the best-@|known other terminal
which follows ANSI guidelines is the DEC VT100.  The APC only recognizes a few
of the more important ANSI commands, and not the complete set which the VT100
supports.

The ANSI/VT100 features that the NEC APC supports are:
@begin[itemize,spread 0]
direct cursor addressing (by row and column)

relative cursor addressing (up, down, left, right)

line erasing (cursor to end, beginning to cursor, entire line)

screen erasing (cursor to end, beginning to cursor, entire screen)

character attributes (underline, reverse video, blink, but not bold)
@end[itemize]
In addition, the first four grey function keys (unshifted) generate the escape
sequences associated with PF1 through PF4 on the VT100 keyboard.  The arrow
keys and numeric keypad DO NOT generate the corresponding VT100 sequences.

These functions are enough to support simple command line editing on most
systems, and allow mailers or paged file display programs to clear the screen
before each display.  Underlining and reverse video are also useful in some
applications.  This is not enough to support the more sophisticated screen
control required by screen editors such as EMACS or KED.  In addition,
due to a bug in the implementation of the CP/M-86 BIOS, the sequence ordinarily
used to home the cursor (esc [ H) does not work correctly; a patch for CP/M to
correct this problem is distributed with APC Kermit-86.