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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.]
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David Gravereaux worked on the DJGPP port that can compile for 8.4a5. Either do a CVS checkout and ask for the 'contrib' module, or send Dave an email. Edevaldo Pereira <[email protected]> did the initial work on this about September 2000 and I added in some stuff from Tom Poindexter's 7.3 port @ http://www.nyx.net/~tpoindex/tcl.html#mstcl
Or better yet, grab the 8.4a4 release @ http://prdownloads.sourceforge.net/tcl/tcl8.4a4_dos.zip