As per Relevance of the word extended, we have this rfc below:
Request for Comments: 698 Jul 1975
NIC #32964
TELNET EXTENDED ASCII
1. Command Name and Code
EXTEND-ASCII 17
2. Command Meanings
IAC WILL EXTEND-
The sender of this command requests Permission to
transmitting, or confirms that it may now begin
extended ASCII, where additional 'control' bits are added
normal ASCII, which are treated sPecially by certain programs
the host computer
IAC WON'T EXTEND-
If the connection is already being operated in extended
mode, the sender of this command demands that the receiver
transmitting data characters in standard NVT ASCII. If
connection is not already being operated in extended ASCII mode
The sender of this command refuses to begin transmitting
ASCII
IAC DO EXTEND-
The sender of this command requests that the receiver
transmitting,or confirms that the receiver of this command
allowed to begin transmitting extended ASCII
IAC DON'T EXTEND-
The sender of this command demands that the receiver of
command stop or not start transmitting data in extended
mode
IAC SB
IAC
This command transmits an extended ASCII character in the form
two 8-bit bytes. Each 8-bit byte contains 8 data bits
-1-
TELNET EXTENDED ASCII
RFC 698, NIC 32964 (July 23 1975)
3.
DON'T EXTEND-
WON'T EXTEND-
i.e., only use standard NVT
4. Motivation
Several sites on the net, for example, SU-AI and MIT-AI,
keyboards which use almost all 128 characters as
characters, and use one or more additional bits as "control' bits
command modifiers or to separate textual input from command input
programs. Without these additional bits, several characters
be entered as text because they are used for control purposes,
as the greek letter "beta' which on a TELNET connection is CONTROL-
and is used for stopping ones job. In addition there are
commonly used programs at these sites which require these
bits to be run effectively. Hence it is necessary to provide
means of sending characters larger than 8 bits wide
5. Description of the option
This option is to allow the transmission of extended ASCII
Experience has shown that most of the time, 7-bit ASCII is typed
with an occasional "control' character used. Hence, it is
normal NVT ASCII would be used for 7-bit ASCII and
extended-ASCII be sent as an escape character sequence
The exact meaning of these additional bits depends on the
program. At SU-AI and at MIT-AI, the first two bits beyond
normal 7-bit ASCII are passed on to the user program and are
as follows
Bit 8 (or 200 octal) is the CONTROL
Bit 9 (or 400 octal) is the META
(NOTE: "CONTROL' is used in a non-standard way here; that is,
usually refers to codes 0-37 in NVT ASCII. CONTROL and META
echoed by prefixing the normal character with 013 (integral symbol
for CONTROL and 014 (plus-minus) for META. If both are present,
is known as CONTROL-META and echoed as 013 014 7-bit character.)
-2-
TELNET EXTENDED ASCII
RFC 698, NIC 32964 (July 23, 1975)
6. Description of Stanford Extended ASCII
In this section, the extended graphic character set used at SU-AI
described for reference, although this specific character set is
required as part of the extended ASCII Telnet option.
described as "hidden" are alternate graphic interpretations of
normally used as format effectors, used by certain
programs
Code Graphic
000 null (hidden vertically centered dot
001 downward
002 alpha (all Greek letters are lowercase
003
004 logical and (caret
005 logical not (dash with downward extension
006
007
010
011 tab (hidden gamma
012 linefeed (hidden delta
013 vertical tab (hidden integral
014 formfeed (hidden plus-minus
015 carriage return (hidden circled-plus
016
017 del (partial differential
020 proper subset (right-opening horseshoe
021 proper superset (left-opening horseshoe
022 intersection (down-opening horseshoe
023 union (up-opening horseshoe
024 universal quantifier (upside-down A
025 existential quantifier (backwards E
026 circled-
027 left-right double headed
030
031 right pointing
032
033 not-
034 less-than-or-
035 greater-than-or-
036 equivalence (column of 3 horizontal bars
037 logical or (V shape
040-135 as in standard
-3-
TELNET EXTENDED ASCII
RFC 698, NIC 32964 (July 23, 1975)
136 upward pointing
137 left pointing
140-174 as in standard
175 altmode (prints as lozenge
176 right
177 rubout (hidden circumflex
-4-
if you see any problems within the linking, don't worry be happy,
this is version 0.1 of the Relevance System and you gotta expect some crappy subroutines sometimes,
just be content we did not write this in Java, which would have made this "bigger and better" HAHAHHA.
RFC documents can be found at I.E.T.F.
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