: 1 - THE UNIVERSITY OF BRITISH COLUMBIA

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THE UNIVERSITY OF BRITISH COLUMBIA
6356 Agricultural Road
Vancouver, B.C., Canada V6T 1W5
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Computing Centre
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Name
: UBC KERMIT
Date
: April 1984
Revised : September 10, 1984
MTS_KERMIT
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Bruce Jolliffe
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Computing Centre
Table_of_Contents
_____ __ ________
INTRODUCTION ...............................................1
USING KERMIT WITH A MICROCOMPUTER ..........................1
a. File Transfers With MTS Server Kermit ...................2
b. File Transfers With MTS User Kermit .....................3
USING KERMIT BETWEEN MTS SITES .............................4
NOTATION ...................................................4
MTS KERMIT COMMANDS ........................................5
MTS SET OPTIONS ............................................6
APPLE KERMIT ...............................................9
APPLE SET OPTIONS .........................................10
IBM PC KERMIT .............................................12
VICTOR KERMIT .............................................12
VICTOR SET OPTIONS ........................................14
UBC KERMIT
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1. INTRODUCTION
____________
Kermit provides a mechanism for the exchange of data between
two like or unlike computers over standard telephone or
computer network communication lines. The microcomputer uses
its RS-232 serial communications port for the transfer.
Cooperating Kermits are started on each machine and data is
transferred between these programs using a communications
protocol. The protocol provides a mechanism whereby data
integrity can be guaranteed. Kermit breaks the data up into
packets, appends a checksum to the packets and sends them off
to the other Kermit. If the other Kermit is satisfied that
the data has not been corrupted during transmission it
returns a positive acknowledgement. If the data has been
damaged then it returns a negative acknowlegement and the
packet is
retransmitted.
This
mechanism
allows
the
transmission of data over relatively noisy lines with some
assurance of data quality.
The Kermit protocol allows the transmission of both ASCII
text and binary files over any network that will accept the
printable ASCII characters. In the case of binary files, any
characters that are non-printable are encoded into printable
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characters and decoded at the other end by the other Kermit.
MTS Kermit can be used to send files between MTS and another
computer that has Kermit. When the two cooperating Kermits
are on MTS hosts an exact image of the MTS file including its
line numbers will be transmitted.
2. USING_KERMIT_WITH_A_MICROCOMPUTER
_____ ______ ____ _ _____________
The microcomputer Kermit programs combine a terminal emulator
with with the Kermit file transfer mechanism. When you start
a microcomputer Kermit it will display a prompt 'Kermit-xx>'
where 'xx' will be some number or name indicating the
microcomputer being used. In the case of the IBM PC this
number is '86' indicating that the microcomputer uses the
8086 family of microprocessors.
After the Kermit prompt is displayed set any necessary
parameters such as baud rates (usually 300 or 1200), parity
(none),
and
possibly
other
microcomputer
dependant
parameters. Then enter CONNECT to establish a connection with
the mainframe. If you are using a dial-up modem then you will
have to establish contact with MTS by either manually dialing
MTS or by entering a command that will cause your modem to
dial MTS.
When the connection has been made the UBCNet logo should
appear on the screen and you can choose the system you wish
to call (usually G or I). If you want to take advantage of
the particular terminal emulation properties of your Kermit,
such
as VT52 emulation then enter the device command
'%Device=VT52' or whatever device name is appropriate. This
will tell the NIM what type of device it is talking to. Next
UBC KERMIT
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you should signon to MTS. Once you are signed on you can use
MTS as you would from any terminal.
All
microcomputer
Kermits
have
an
"escape back to
micromputer" sequence. Typically this is the sequence of
keystrokes 'Ctrl- C'. This sequence is used to return to the
microcomputer Kermit command mode. You can return to the
local microcomputer operating system by entering the Kermit
command EXIT. Remember that escaping back to your local
microcomputer does not sign you off. You must reconnect to
the mainframe and issue '$signoff' to signoff.
a. File_Transfers_With_MTS_Server_Kermit
____ _________ ____ ___ ______ ______
To transfer files between the your microcomputer and MTS
you must start Kermit on MTS. To start Kermit enter:
$Run Net:Kermit
Kermit will start in user mode and respond with the prompt
"Kermit-UBC...>". If your Kermit is capable of talking to
a server Kermit (see
the
individual
microcomputer
descriptions) enter:
SERVER
If you cannot talk to a server Kermit see the next
subsection.
At this point you are ready to transfer files. Escape back
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to your local microcomputer Kermit ('Ctrl- C'). The local
computer Kermit prompt (Kermit-xx>) will appear on the
screen. If you wish to send a file from the micromputer to
MTS enter:
SEND filename
where 'filename' is the name of the local filename to be
sent to MTS. A file by that name will be created on MTS
and the data from local file will be placed into the MTS
file. If the file already exists on MTS the file will be
emptied before the transfer begins. To transfer a file
from MTS to the microcomputer enter one of:
GET filename
or
RECEIVE filename
where 'filename' is the name of the MTS file to be
transferred to the microcomputer. See the section on the
relevant microcomputer for which command to use.
While the file is being transferred the microcomputer will
display the number of packets transferred and any error
UBC KERMIT
3
conditions that might arise. After you have finished
transferring files to and from the microcomputer enter
FINISH to shut down the MTS Kermit server. You can then
enter CONNECT and resume your MTS terminal session.
b. File_Transfers_With_MTS_User_Kermit
____ _________ ____ ___ ____ ______
If your Kermit is incapable of talking to a server Kermit
follow the procedures in this section. As described in the
last section start MTS Kermit by entering the command:
$Run Net:Kermit
This will
start
Kermit
in
user
mode
and
the
"Kermit-UBC..>" will appear. To transfer a file from the
microcomputer to MTS enter the command:
RECEIVE mts_filename
where 'mts_filename' is the name of the file to be used
for the data transferred from the microcomputer. Now
escape back to the microcomputer ('Ctrl- C') and enter the
command:
SEND micro_filename
where 'micro_file' is the name of the microcomputer file
that is to be transferred to MTS. After the file has been
sent enter the CONNECT command to return to the MTS
terminal session. At this point you will still be in MTS
Kermit. Enter STOP to exit from MTS Kermit.
To transfer a file from MTS to the microcomputer start MTS
Kermit in user mode as described above and then enter the
command
SEND mts_filename micro_filename
where 'mts_filename' is the name of the MTS file that is
to be transferred and 'micro_filename' is the name of the
file on the microcomputer that the transferred data is to
be placed. Now escape
back
to
the
microcomputer
('Ctrl- C') and enter the command:
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RECEIVE
There will be some delay and then the file transfer will
begin. The delay is to allow you time to enter the RECEIVE
command. The SET DELAY command can be used when in the MTS
Kermit to change this value. Once the file transfer is
complete you can return to the terminal session by
entering the CONNECT command. At this point you will be in
MTS Kermit. You can enter STOP to quit MTS Kermit and
return to MTS.
UBC KERMIT
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3. USING_KERMIT_BETWEEN_MTS_SITES
_____ ______ _______ ___ _____
If MTS Kermit is installed at a remote site then files may be
easily sent to or gotten from the remote site using the
standard Net:Call program. Kermit is invoked in Net:Call by
issuing the /Kermit command. This command will start up
Kermit at the local site and attempt to start up Kermit at
the remote site. A banner line will be printed and Kermit
will be ready to accept commands as described in the "MTS
Kermit" section. If Kermit is unable to start up the remote
Kermit a message to that effect will be printed. Currently
remote MTS Kermit sites include Simon Fraser University
(SFU), University of Alberta (UQV), and University
of
Michigan (UM).
Kermit may be batched by using the net call command:
/Kermit input=Kermit_Commands
where 'Kermit_Commands' is a file containing a list of Kermit
commands. It is also a good idea to include a /Delay
statement before the /Kermit command so that things are given
a chance to settle down before the Kermit program is started.
The following is an example of a batch job to grab a file
from a remote site.
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sig ccid
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password
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$Mount Net *MERIT* Dest=Telenet-31300062
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$Run Net:Call 0=*merit* par=/input *source*
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um
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sig wubc
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password
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/delay 10
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/kermit input=kermit.move(1000)
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sig $
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$endfile
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1000
get remotefile localfile
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stop
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4. NOTATION
________
The following notation is used in the command descriptions.
Items in UPPER CASE letters are what is to be entered. Items
in lower case letters are generic terms and what is to be
entered is given in the description of the command. Items
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appearing with in square braces (' ' and ' ') are optional.
Items of the form ' a!b ' mean that you must choose either
'a' or 'b'.
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5. MTS_KERMIT_COMMANDS
___ ______ ________
In this section the commands available to MTS Kermit are
given.
BYE
A synonym for STOP.
EXIT
A synonym for STOP.
FINISH
This command stops a remote server Kermit without
stopping the local Kermit.
GET remote_filename
local_filename
The 'remote_filename' is a file at the remote Kermit
that is to be copied to the local system. If the
optional 'local_filename' is specified the file will be
placed into the local file having that name. If the
optional parameter
is
not
specified
then
the
'remote_filename' will be used. If the local file
doesn't exist it is created and if it already exists it
is emptied before the text from the remote file is
added. If Kermit is unable to open the local file then
the incoming file will be placed in the scratch file
-KERMIT. This command is only applicable when the
remote Kermit is a Server Kermit. In MTS to MTS file
transfer the remote Kermit will be a Server Kermit.
HELP
This command invokes the Kermit help server.
QUIT
A synonym for STOP.
RECEIVE
local_filename
This command is used when MTS Kermit is in user mode
talking to another Kermit in user mode. In that case
file transfer is a two step process. If MTS Kermit is
the local Kermit, that is, it established a connection
with the other Kermit using either the SET LINE command
or the NET:CALL command /Kermit then the steps given
below apply. If MTS Kermit is the remote Kermit, that
is, the other Kermit is a microcomputer Kermit or
another mainframe Kermit made a connection to this
Kermit then the procedures given in the subsection
"File Transfers With MTS User Kermit" should
be
followed.
UBC KERMIT
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First the SEND command is issued by the remote Kermit
and the user escapes back to MTS Kermit. The user then
issues a RECEIVE command and the file is transferred
after a short DELAY.
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SEND local_filename
remote_filename
The 'local_filename' is sent to the remote Kermit. If
the second parameter 'remote_filename' is specified the
file will be sent to the file by that name at the
remote location. If the second parameter is not given
then the file will be sent to the file by the same name
as the 'local_filename' at the remote location.
SERVER
This command puts Kermit into Server mode. In this mode
the user must escape to the other Kermit and talk to
this Kermit through the
other
Kermit.
When
a
"$Run Net:Kermit" is issued on MTS the Kermit comes up
in server mode. If the user specifies "Par=u" then the
Kermit will come up in user mode.
SET set_option
This command is used to set various options. It is
covered in a separate section 'MTS Set Options'.
SHOW show_option
This command is used to display any of the options that
can be set by the SET command. See the section on "MTS
Set Options" for further details.
STOP
This command stops the local Kermit and if it is
talking to a remote MTS server Kermit it also stops it.
Synonyms for this command are 'Bye', 'Exit' and 'Quit'.
$MTS_Command
This passes the 'MTS_Command' to the
local
MTS
operating system.
6. MTS_SET_OPTIONS
___ ___ _______
There are a number of set options. The options given below
are set by issuing the SET command followed by the option.
The value of the option can be found by issuing the SHOW
command and the name of the option.
UBC KERMIT
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BINARY-BLOCKSIZE n
This option sets the number of bytes that should be
used per line when a binary file is received by MTS.
The default is 64 bytes but this value can be set to
any 'n' in the range 1 to 32,767.
DEBUG
OFF!ON
This option is primarily for those in charge of
maintaining MTS
Kermit.
It
causes
the
packet
transmission to be logged on a file KERMIT.LOG. If for
some reason this file is unavailable -KER.LOG will be
used. If the Kermit is talking to a remote MTS Kermit
then logging will also be done at the remote site.
DELAY
This option is used to control the amount of time the
SEND command waits after it is issued before sending
the first packet. This is to accommodate non-server
remote Kermits. When both Kermits are running in user
mode and a file is to be sent from MTS to the other
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Kermit the user must issue a SEND from the MTS Kermit,
escape back to his local Kermit and issue a RECEIVE.
The delay gives him a chance to do this. The default
delay is 10 seconds. If MTS Kermit knows it is talking
to another remote MTS server Kermit the delay will be
zero.
FILETYPE
TEXT!BINARY!MTS-BINARY
Files can be sent in one of three modes, text, binary,
and
MTS-binary. The default mode for talking to
microcomputers is text. In this mode MTS Kermit expects
the remote Kermit to send each line of the file in
ASCII with a carriage return (CR) line feed (LF)
separating each line. The MTS
Kermit
translates
incoming
lines
into their equivalent MTS EBCDIC
characters using the ASCII to MTS EBCDIC system tables.
For outgoing files the MTS EBCDIC to ASCII translation
table is applied and an ASCII CRLF is appended to the
end of each line.
In binary mode CRLF are not treated in any special way.
Binary mode results in an exact image on a byte by byte
basis of the file. No translation is done from ASCII to
MTS
EBCDIC
or
vice
versa.
The
SET
option
'BINARY-BLOCKSIZE' can be used to set the number of
bytes to store in each line of an incoming binary file.
No CRLF's are inserted into the text of outgoing binary
files. Binary is useful for moving object code from one
machine to the other. Of course if the machines are
incompatiable
the
binary
code will probably be
uninteligiable on the other machine. Still the remote
machine can be used for storage and the like.
UBC KERMIT
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The MTS-binary mode makes sense only between two remote
MTS Kermit sites. In this mode, as in binary mode, no
translation takes place on route between sites. The
MTS-binary differs in that the new transferred file
retains the line numbering and line lengths of the
original file. It also tries to create a file at the
remote site as close as possible to the original file.
It creates a file of the same type, either line or
sequential having the same minsize as the original. The
Nosave status and Pkey are also retained. The resulting
file is essentially 'Duplicated'. The only attribute
that is not duplicated is the permit status of the
file. This mode is not part of the original Kermit
protocol but is implemented as an added layer on top of
the binary mode.
NOTIFY n
When MTS Kermit is sending or receiving packets it
prints a count of the number of packets sent or
received. The notify option can be used to determine
the frequency at which this count is displayed. The
default is every 20 packets.
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LINE *n*
This command is used to connect Kermit to a remote
site. The psuedo device name *n* should be a mounted
network connection to the remote site that the Kermit
is to talk to. The remote connection can alternatively
be indicated by assigning a remote connection to unit 0
when Kermit is started. Note that in the case of using
Kermit
within
Net:Call,
the
/Kermit
command
automatically assigns the remote connection to Kermit.
RECEIVE Receive_Parameter n
This command can be used to adjust some of the
characteristics of the Kermit protocol to accommodate
non-standard Kermits. The Receive parameters are used
to set the values you expect incoming packets to have.
The
Receive parameters should be from the list:
END-OF-LINE, PACKET-LENGTH, PADDING, PADCHAR, QUOTE,
START-OF-PACKET, and TIMEOUT. The 'n' parameter should
be an integer. In cases where a character is required
such
as END-OF-LINE, this number is the decimal
equivalent of the ASCII character.
SEND Send_Parameter n
This command can be used to adjust some of the
characteristics of the Kermit protocol to accommodate
non-standard Kermits. The Send parameters are used to
set the values you expect outgoing packets to have. The
Send parameters should be from the list: END-OF-LINE,
UBC KERMIT
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PACKET-LENGTH,
PADDING,
PADCHAR,
QUOTE,
START-OF-PACKET, and TIMEOUT. The 'n' parameter should
be an integer.In cases where a character is required
such
as END-OF-LINE, this number is the decimal
equivalent of the ASCII character.
7. APPLE_KERMIT
_____ ______
Apple Kermit (Kermit-65) can be used to emulate a VT52 and to
transfer files between the Apple II and MTS. A list of the
Apple Kermit commands follows. In the commands below the term
remote Kermit means the other Kermit that the Apple Kermit is
talking to. In most cases this will be MTS Kermit. The Apple
Kermit can talk to a Server Kermit so to use it with MTS
follow the directions given in the subsection "File Transfers
With MTS Server Kermit". Also see "FILE-BYTE-SIZE" and
"FILE-TYPE" in "Apple Set Options".
The Apple Kermit is available in the public file KER:APPLEK.
If you already have MCP AMIE then you can %TELECOPY, in
binary, the program to your Apple. Apple Kermit is also on
the MCP AMIE floppy discs that are available from the
Computing Centre Reception area.
BYE
This command tells the remote server Kermit to stop and
to sign you off. When this is done it stops Apple
Kermit and returns you to DOS.
CONNECT
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This command starts Apple Kermit terminal emulation
mode.
EXIT
This command stops Apple Kermit and you are returned to
DOS.
FINISH
This command stops a remote server Kermit.
GET remote_filename
This commands is used to transfer the remote file
'remote_filename' from a Server Kermit to the Apple.
The file will be placed into a file with the same name
on the Apple.
QUIT
A synonym for EXIT.
UBC KERMIT
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RECIEVE
local_filename
The receive command is used when Apple Kermit is
talking to another Kermit in user mode and a file is to
be transferred from the remote user Kermit to the Apple
Kermit. If a 'local_filename' is given then
the
incoming file will be placed into that file, if not
then the incoming filename will be used.
SEND filename
The file with given 'filename' will be sent to the
other remote Kermit. This command can be used with both
remote User and remote Server Kermits.
SET set_option
This command is used to set various options. More
details may be found in the section 'Apple
Set
Options'.
SHOW show_option
This command is used to display the current setting of
any settable option. See the section on "Apple Set
Options" for further details.
STATUS
This command is used display some statistics on the
file transfer. This includes counts of the number of
characters sent.
8. APPLE_SET_OPTIONS
_____ ___ _______
There are a number of options that may be set in Apple
Kermit. The options are set by entering SET followed by the
keyword and value given below. The current value of any
settable option can be found by entering SHOW followed by the
name of the option.
DEBUGGING
OFF!TERSE!VERBOSE
If TERSE or VERBOSE is given then a copy of each packet
is displayed on the screen.
DEVICE-DRIVER device
This option is used to tell Apple
Kermit
what
communications device is being used. 'device' may be
one of APPLE-COM-CARD (Apple Communications Card),
DC-HAYES (D.C. Hayes Micromodem II), or SUPER-SER-CARD
(Apple Super Serial Card).
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EIGHT-BIT-QUOTING ON!OFF
This option sets eight-bit-quoting on or off. This
option can be used when talking to another Apple Kermit
though a connection that only allows seven bits to be
sent.
ESCAPE hex_value
This option resets the escape character
to
the
'hex_value' given. 'hex_value' is a pair of hexadecimal
digits.
FILE-BYTE-SIZE size
'size' should be set to SEVEN if text files are to be
transferred and 'EIGHT' if binary files are to be
transferred.
FILE-TYPE type
This option sets the filetype begin transferred. 'type'
is
one
of APPLESOFT, BINARY, INTEGER, or TEXT.
APPLESOFT and INTEGER are flavours of Basic files,
BINARY is a core image (use eight-bit file-byte-size),
and TEXT is ASCII (use seven-bit
file-byte-size,
received characters will be written in negative ASCII).
FILE-WARNING
ON!OFF
If FILE-WARNING is ON then any incoming file with the
same name as an already existing file, say x, will be
put into a different file with a with the name
'x.version' where version is an integer chosen to make
the name unique. If FILE-WARNING is OFF then any
incoming file will replace any existing file by the
same name.
IBM
ON!OFF
Allows transfer to IBM hosts that require XON (Ctrl-Q)
to "turn the line around". This option also sets parity
to mark and turns local echo on. This option is NOT
applicable to MTS hosts.
LOCAL-ECHO
ON!OFF
Specifies whether or not characters entered during
terminal emulation mode should be echoed. Normally this
is OFF since the host will echo all characters entered.
PARITY type
'type' is one of NONE (default, eight data bits, no
parity), MARK (seven data bits, parity bit set to one),
SPACE (seven data bits with parity bit set to zero),
UBC KERMIT
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EVEN (seven data bits, parity set to make overall
parity even), ODD (seven data bits, parity set to make
overall parity odd).
RECEIVE receive_parameter nn
This command can be used to adjust some of the
characteristics of the Kermit protocol to accommodate
non-standard Kermits. The receive parameters are used
to set the values you expect incoming packets to have.
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The receive parameters should be from the
list:
EIGHT-BIT-QUOTE-CHAR,
END-OF-LINE,
PACKET-LENGTH,
PAD-CHAR, PADDING, QUOTE-CHAR, and TIMEOUT. The 'nn'
parameter should be a pair hexadecimal of digits.
SEND send_parameter nn
This command can be used to adjust some of the
characteristics of the Kermit protocol to accommodate
non-standard Kermits. The send parameters are used to
set the values you expect outgoing packets to have. The
send
parameters
should
be
from
the
list:
EIGHT-BIT-QUOTE-CHAR,
END-OF-LINE,
PACKET-LENGTH,
PAD-CHAR, PADDING, QUOTE-CHAR, and TIMEOUT. The 'nn'
parameter should be a pair of hexadecimal digits.
SLOT n
'n' is the slot number in which the communications card
has been placed. The default is 2.
VT52-EMULATION
ON!OFF
Tells Kermit whether or not to act like a VT52 terminal
when in terminal emulation mode (CONNECTed).
9. IBM_PC_KERMIT
___ __ ______
PC Kermit can be used to emulate a VT52 terminal and to
transfer files between MTS and an
IBM
PC.
Detailed
documentation may be found in the file KER:MSKERMIT.DOC. The
IBM PC Kermit can talk to a Server Kermit so you should
follow the directions given in the subsection "File Transfers
With MTS Server Kermit".
PC Kermit is available in the public file KER:PCKERMIT.EXE.
If you already have MCP WINDOW then this file can be
%TELECOPIED in binary to your PC.
10. VICTOR_KERMIT
______ ______
The Victor Kermit commands are given below. The Victor Kermit
does not seem to recognize 'Alt- ' as the start of the escape
back to microcomputer sequence. To be able to escape back use
'SET ESCAPE char' to set 'char' to some printable character
you don't expect to use during a terminal session.
UBC KERMIT
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MS-DOS Victor Kermit is available in the public
file
KER:VICKER.EXE. If you already have MCP WINDOW then this file
can be %TELECOPIED in binary to your PC.
BYE
This command tells the remote server Kermit to stop and
to sign you off. When this is done it stops Victor
Kermit and returns you to DOS.
CONNECT
This commands starts Victor Kermit terminal emulation
mode.
EXIT
This command stops Victor Kermit and you are returned
to DOS.
FINISH
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0
1
0
0
+
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
This command stops a remote server Kermit.
LOGOUT
This command tells the remote server Kermit to stop and
to sign you off. When this is done it leaves you in
Victor Kermit.
RECEIVE remote_filename
The receive command gets a file from a remote Kermit.
If 'remote_filename' is specified the Victor Kermit
assumes you are talking to a Server Kermit and will
transfer the file 'remote_filename' from the remote
Kermit and place it into a local file by the same name.
SEND filename
The file with given 'filename' will be sent to the
other remote Kermit.
SET set_option
This command is used to set various options. More
details may be found in the section "Victor Set
Options".
SHOW show_option
This command is used to display the current setting of
any settable option. See the section on "Victor Set
Options" for further details.
UBC KERMIT
14
STATUS
This command is used display some statistics on the
file transfer.
11. VICTOR_SET_OPTIONS
______ ___ _______
There are a number of options that may be set in Victor
Kermit. The options are set by entering SET followed by the
keyword and value given below. The current value of any
settable option can be found by entering SHOW followed by the
name of the option.
BACKARROW
BACKSPACE!DELETE
This option determines which value will be sent the
host when a backarrow is entered in terminal emulation
mode.
BAUD speed
Set the terminal speed to use. 'speed' may be one of
the numbers 300, 1200, 1800, 4800 (default) or 9600.
BELL
ON!OFF
Set the bell so that it rings after a file transfer.
DEBUG ON!OFF
If DEBUG is ON packets are displayed during file
transfer.
END-OF-LINE n
Resets the end-of-line character to the decimal number
'n'. The number must be between 0 and 31.
ESCAPE char
Change the escape character from the default 'Ctrl- '.
FILE-WARNING
ON!OFF
If FILE-WARNING is ON Victor Kermit and Victor Kermit
receives a file by the same name as an already existing
0
0
1
0
0
0
0
0
file, then it will warn you and put the incoming file
into a file with another name.
H19-EMULATION
ON!OFF
If ON then Kermit will emulate an H19 (VT52).
UBC KERMIT
15
IBM
ON!OFF
If ON then Victor Kermit will send the necessary
control information to talk to an IBM mainframe. It
will also set the parity appropriately and set local
echoing on. Default is OFF. This option is
NOT
applicable to MTS hosts.
INCOMPLETE
DISCARD!KEEP
If a file transfer terminates unexpectedly and DISCARD
is set then any portion of the file so far transferred
will be discarded. If KEEP is given then whatever was
transferred will be kept. The default is DISCARD.
PARITY type
'type' is one of NONE (default, eight data bits, no
parity), MARK (seven data bits, parity bit set to one),
SPACE (seven data bits with parity bit set to zero),
EVEN (seven data bits, parity set to make overall
parity even), ODD (seven data bits, parity set to make
overall parity odd).
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