[comp.protocols.tcp-ip] Using DEC VT200 mode through telnet

enger@BLUTO.SCC.COM (02/24/88)

Greg:
I believe VT200 mode allows the system to transmit 8-bit control codes to the
terminal.  TPU takes advantage of this.  For instance, the "<esc>[" sequence
is replaced by "<csi>" (9B in hex).  This makes the host/terminal
communications more compact, and perhaps quicker. 

Unfortunately, the intervening com facilities must pass 8-bit codes.
I don't think telnet normally does this.

I logged into my Sun running their latest software, but couldn't find
an option to put its telnet into binary mode.

I logged onto our VMS Vax, and fired up the Wollongong telnet. It does support
a "binary" mode, and this successfully runs TPU. Unfortunately, the command
cannot be placed into their TELINIT. telnet startup configuration file;
instead it must be typed in manually once the connection has been opened. 

Best wishes,
Bob Enger

jch@DEVVAX.TN.CORNELL.EDU (Jeffrey C Honig) (02/25/88)

The SET TERM command on VMS has a qualifier /NOEIGHTBIT or something
similar that will solve your problem.

Jeff

VSRAANAN@WEIZMANN.BITNET (raanan michael) (02/25/88)

Greg, Bob.
i had the same problem here wile telnet vms (excelan exos board) to
unix machine.
  we succeeded to make telnet connection by typing "<cntrl> j"
  (linefeed) after <cr> during logon time (userid and password).
  another command that helped was "set term/noeight" before telnet.
  in that case the connection will be done with 7 bit, so  vt220
  8 bit functions will not work.
  raanan.