Letter to All TIP Users
RFC 365

Document Type RFC - Unknown (July 1972; No errata)
Last updated 2013-03-02
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Network Working Group                 David Walden
Request for Comments #365             Bolt Beranek and Newman Inc.
NIC # 10607                           July 11, 1972
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                       A LETTER TO ALL TIP USERS

Dear TIP Users,

     You will shortly be sent a revised version of the "TIP User's
Guide."  Besides now having a loose leaf format, mainly descriptions
of new commands have been added.  Appendix B will be an alphabetical
list of all TIP commands.  The new commands are:

     @BINARY INPUT START
     @BINARY INPUT END
     @BINARY OUTPUT START
     @BINARY OUTPUT END
     @CLEAR DEVICE WILD
     @CLEAR INSERT LINEFEED
     @INSERT LINEFEED
     @SEND COMMAND
     @RECEIVE FROM WILD
     @SEND TO WILD
     @SET DEVICE WILD
     @MAG ABORT
     @MAG BACKSPACE FILE
     @MAG BACKSPACE RECORD
     @MAG READ FILE
     @MAG READ RECORD
     @MAG SETUP COPY
     @MAG SPACE FILE
     @MAG SPACE RECORD
     @MAG UNLOAD
     @MAG WRITE EOF
     @MAG WRITE TAPE

The MAG commands are, of course, not relevant to users of TIPs without
the magnetic tape option.

     A TIP system including the above commands has been in operation
since late June.  We think this system is a substantial improvement
over previous versions.

                                                                [Page 1]
RFC # 365                                                  July 11, 1972

     In case you've not been keeping track, there are now eleven TIPs
in the ARPA Network.  These are ETAC, GWC, AMES, ARPA, MITRE, NBS,
BBN, USC, NOAA, ROME, and SAAC.  Also, a TIP will soon be installed at
CCA.

     I'll now briefly discuss a number of topics I think may be
interesting to you.

     Getting TIP status information.  As we develop new features for
the TIP and fix bugs, we are continually releasing new versions of the
TIP program.  We do this by just reloading your TIP when you're not
looking (i.e., when no one is using your TIP).  In the future we will
notify you whenever a new version of the TIP program is loaded into
your TIP by adding a tiny "status message" to the "HELLO" you get when
you "log onto" the TIP.  This status message will usually be merely
the TIP's version number; however, occasionally the message will
indicate (by typing "NEWS") that there is some news about the TIP's
status which you should read before continuing your session with the
TIP.  The NEWS can be retrieved by typing the command @NEWS which will
ICP to a special socket at BBN's TENEX or PDP-1D which will print the
news.  Of course, either of these systems may sometimes be down, but
we won't worry about the problem until we see how serious it is.

     To whom to complain or make suggestions.  Many of you have had
occasion to complain about the operation of your TIP system or to make
suggestions for its improvement.  All too frequently, however, these
complaints have been directed to the Host system you are using from
the TIP instead of to us.  BBN maintains a Network Control Center
which is always manned.  Its telephone number is 617-661-0100.  All
TIP problems should be reported immediately to the Network Control
Center.  If you have a suggestion for a new command, or if you think
you've found a subtle bug in the TIP program, ask to talk to Dave
Walden or Bernie Cosell when you call the Network Control Center.

     Device buffers. In general, each TIP MLC port has a different
size buffer allocated to it and therefore to the device connected to
the port.  Devices which operate at higher speeds, of course, require
larger buffers, especially output buffers.  If you need more buffering
than you have (frequently indicated by output coming in short bursts),
try to arrange with whomever is locally responsible for the TIP you're
using to come in through a port with a larger buffer allocation.  If
necessary, this person can arrange with us to specially tailor the
buffer allocation for your TIP.

                                                                [Page 2]
RFC # 365                                                  July 11, 1972

     There are presently only about 2500 characters of buffers
available for the TIPs terminal devices.  Since each device has an
input buffer and two output buffers (output is double buffered), each
of the 63 devices has available an average of about 13 charac- ters
for input and 13 characters for each output buffer.  Since there is
continual pressure for new features in the TIP and for old features to
work more conveniently, the space available for device buffers is
steadily decreasing.  There seem to be two ways to increase the space
available for device buffers; the first is to get more core memory;
the second is to modularize the program so that unneeded features can
be removed from particular sites.  For instance, the 2741 code and
character conversion tables might be removed from a site at which they
were never used.  You always have the option of getting more core for
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