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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]
+
+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]
+
+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]
+
+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]
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+Winett [Page 4]
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