A new portable TECO based on TECO-32 V40. Written in C. http://teco-lang.org
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The "save link" script does not appear to work on github, at least in Firefox/Windows. It works on Chrome/OS X.
Computer history collections: PDP-10 archive (includes the TECO Emacs), SIMH the computer history simulator and a copy of bitsavers, which contains lots of software and high-resolution scans of many documents (including e.g. data books of electronic parts).