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IETF RFC 110

Conventions for using an IBM 2741 Terminal as a User Console for Access to Network Server Hosts

Last modified on Friday, August 21st, 2009

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Network Working Group                                          J. Winett
Request for Comments: 110                         MIT Lincoln Laboratory
NIC: 5809                                                  25 March 1971

    Conventions for Using an IBM 2741 Terminal as a User Console for
                     Access to Network Server Hosts

   Disclaimer

   This material has not been reviewed for public release and is
   intended only for use with the ARPA network.  It should not be quoted
   or cited in any publication not related to the ARPA network.

   TO: NIC
   FROM: Joel M. Winnet (LL)
   SUBJECT: Conventions for Using an IBM 2741 Terminal as a User
   Console for Access to Network Server Hosts

   An IBM terminal can be used to key in 92 different codes.  These
   include 88 graphics plus the 4 controls SP, BS, HT, and NL.  Each of
   these have defined ASCII codes except the cent graphic ([1]) and the
   New Line Control (NL).  When the NL character is keyed, the program
   receiving the keyboard input can translate this signal into the
   appropriate line end signal for the host which is being used.  That
   is, to a NL, CR, or LF code whichever is appropriate.  There are 7
   other ASCII graphic characters ( {, }, [, ], ^, \, `) and 31 other
   ASCII controls which cannot be keyed on a 2741 terminal.  A
   convention must be established so that all 128 ASCII codes can be
   keyed from a 2741 terminal.  This requires that one character be
   chosen as an escape (or prefix) character which,a together with
   following characters, can be converted into any desired ASCII code.
   In addition to this escape character, there are three other functions
   which are usually indicated by the typing of a single character key.
   These are:

      a) character delete -- to cause this character and the preceding
         character in the input line to be deleted.

      b) line delete -- to cause this character and all previous
         characters in the current input line to be deleted.

      c) logical line end -- to cause all characters keyed after the
         last logical line end character or last NL character up to this
         character to be considered as one logical line with this
         character being treated as if the NL key were entered.
         Characters following the logical line end character up to
         another logical line end character or a NL character are used
         for form another input line.



Winett                                                       PAGE 1 top


RFC 110 Conventions for Using an IBM 2741 25 March 1971 Since characters keyed are normally sent to the Server Host, a method must be defined to allow characters keyed to be interpreted by the user program. A system escape character can be used for this purpose. On character at a time systems, the characters keyed between two system escape characters can be interpreted by the user program. On line at a time systems, characters keyed after the system escape character and up to and including a NL character can be interpreted by the user program. Lines interpreted by the user program are not sent to the Server Host. For those host systems which require use of the INS or INR network control commands, a method must be defined for causing these commands to be sent. These can be sent on a command to the user program either after keying the system escape character or through the use of the 'attention' button on a 2741 terminal. This choice will depend on the characteristics of the terminal user's operating system. Other commands to the user program might be to: a) suppress typeout of received messages b) restore typeout of received messages c) direct received message to a disk file d) direct keyed input to a disk file e) abort the user program The following characters are recommended for the special functions listed above: 1. character escape $NOT [1] 2. system escape | 3. character delete @ 4. line delete $CENT [1] 5. logical linend # For the 7 ASCII graphics not on a 2741 terminal, the following character escape and graphic pairs are recommended: $NOT < to translate to [ $NOT > to translate to ] $NOT ( to translate to { $NOT ) to translate to } $NOT " to translate to ^ $NOT / to translate to \ $NOT ' to translate to ` Winett PAGE 2 top

RFC 110 Conventions for Using an IBM 2741 25 March 1971 To permit the special function characters to be keyed, the following character escape and graphic pairs are recommended: $NOT - to translate to $NOT $NOT : to translate to | $NOT , to translate to @ $NOT . to translate to $CENT $NOT = to translate to # To key in the ASCII control codes, it is recommended that the character escape followed by two letters be used to specify a control code. These two letters are derived from the mnemonic name of the ASCII control function and are as follows: $NOT AC to translate to ACK X'06' $NOT BE to translate to BEL X'07' $NOT BS to translate to BS X'08' $NOT CA to translate to CAN X'18' $NOT CR to translate to CR X'0D' $NOT D1 to translate to DC1 X'11' $NOT D2 to translate to DC2 X'12' $NOT D3 to translate to DC3 X'13' $NOT D4 to translate to DC4 X'14' $NOT DE to translate to DEL X'7F' $NOT DL to translate to DLE X'10' $NOT EM to translate to EM X'19' $NOT EN to translate to ENQ X'05' $NOT EO to translate to EOT X'04' $NOT ES to translate to ESC X'1B' $NOT EB to translate to ETB X'17' $NOT EX to translate to ETX X'03' $NOT FF to translate to FF X'0C' $NOT FS to translate to FS X'1C' $NOT GS to translate to GS X'1D' $NOT HT to translate to HT X'09' $NOT LF to translate to LF X'0A' $NOT NA to translate to NAK X'15' $NOT NU to translate to NUL X'00' $NOT RS to translate to RS X'1E' $NOT SI to translate to SI X'0F' $NOT SO to translate to SO X'0E' $NOT SH to translate to SOH X'01' $NOT SP to translate to SP X'20' $NOT ST to translate to STX X'02' $NOT SU to translate to SUB X'1A' $NOT SY to translate to SYN X'16 $NOT US to translate to US X'1F' $NOT VT to translate to VT X'0B' Winett PAGE 3 top

RFC 110 Conventions for Using an IBM 2741 25 March 1971 Note that the controls SP, BS, and HT can be specified using the character escape character or directly by keying the appropriate key on a 2741 terminal. Endnote [1] The following identifiers are substituted for graphics not in ASCII: $CENT Cent sign $NOT Logical NOT ("bent bar") See the PDF version of this document for graphics that cannot be represented in ASCII format. [This RFC was put into machine readable form for entry] [into the online RFC archives by Lorrie Shiota, 10/02] Winett PAGE 4 top

Conventions for using an IBM 2741 Terminal as a User Console for Access to Network Server Hosts RFC TOTAL SIZE: 8586 bytes PUBLICATION DATE: Friday, August 21st, 2009 LEGAL RIGHTS: The IETF Trust (see BCP 78)


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