NWG/RFC# 747 MRC 21-MAR-78 44015
Recent Extensions to the SUPDUP Protocol
Network Working Group Mark Crispin
Request for Comments 747 SU-AI
NIC 44015 21 March 1978
Updates: RFC 734. See also RFC 746.
Recent Extensions to the SUPDUP Protocol
- Recently, some extensions have been made to the SUPDUP protocol. RFC
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- 746, by Richard Stallman, documented the SUPDUP graphics extension.
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- In addition, a TTYOPT bit has been added and two more variables have
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- been added to the initial negotiation. This RFC describes the changes
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- from RFC 734, but excludes the detailed information in RFC 746.
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- These extensions are upwards and downwards compatable, and are
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- completely optional. For most SUPDUP user and server programs,
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- RFC 734 remains an adequate description of the protocol.
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- However, it is suggested that if the console's line speed is
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- known, the user SUPDUP should be modified to send the new ISPEED and
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- OSPEED variables (sending 0 for SMARTS if the graphics extension is
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- not to be used) so the server can handle buffering for the terminal
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- better.
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- Since these changes are compatable and optional, and since the SUPDUP
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- protocol is being actively worked on at the present time, I have elected
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- to issue this update RFC rather than an updated version of RFC
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- 734. An updated 734 will be issued when the protocol stabilizes again.
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- Three new variables have been added to the initial negotiation. In
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- order, they are SMARTS, ISPEED, and OSPEED. Consequently, the count
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- should now be -10,,0, or, in octal, 777770000000.
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- The SMARTS variable specifies what "smarts" (in general, what graphics
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- capabilities) the terminal has. Like the TTYOPT variable, a bit being
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- true implies that the terminal has this option. RFC 746 describes this
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- variable and the SUPDUP graphics option in complete detail. If
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- the graphics extension is not to be used, SMARTS should be set to 0.
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- The ISPEED and OSPEED variables are respectively the input and output
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- baud rates of the terminal, if known. For example, a 150./1200.
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- baud terminal would have an ISPEED of 150. and an OSPEED of 1200. A
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- speed of zero means the line speed is indeterminate.
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- The %TPPRN TTYOPT bit (value 0,,200) has been added. This bit
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- specifies that the system should swap parenthesis with square brackets
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- on input. This is often desirable for LISP users who are using a
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- terminal which has parenthesis as a shift character but not
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- square brackets. This bit is normally off and servers are not required
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- to implement it.
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