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Java Supdup

Download (precompiled for Java 1.5, or the source) a Supdup-enabled version of the Java Telnet application. The original code is fairly easy to add plugins to, but so far I had to hardcode the use of the supdup terminal emulator, so this version is only useful for Supdup.


handle MacOS X Escape key and Control-Space, and supply a MacOS application (.tar.gz). (The Alt key doesn't work yet.)


avoids idle (logged-in) disconnection by periodically sending a “keep-alive” to ITS.


supports the SAIL character set! Thanks MMcM!

To run, use

  java -jar supdup.jar [hostname]

Note that the window can be resized, but the change only gets through to ITS at connection time (due to the Supdup protocol). Note also that you can use Ctrl+X for non-alpha X, e.g. digits, at least in Linux - it doesn't seem to work in Windows. Note also that you can use it as an applet, if your Java sandbox allows.


Things to do on a rainy day:

  • implement the graphics extension (RFC746) (and port Spacewar?)
  • add a plugin for Chaosnet (over the CHUDP protocol, see here) to connect to Chaos-only hosts

Java is a trademark or registered trademark of Sun Microsystems, Inc. in the United States and other countries. The Java Supdup author (Björn Victor) is independent of Sun Microsystems, Inc.

supdup.txt · Last modified: 2015-12-30 15:26 by victor