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Several people, including Stephen Trier, have ported (a version of) Tcl to MS-DOS. [list others--some appear in "Small Tcl"]
[ CL believes he remembers it being quite easy to do this with 7.4.]
David Gravereaux worked on a DJGPP port that can compile for 8.4a5. Either do a CVS checkout and ask for the 'contrib' module, or send Dave an email.