I recently added a link to source code for DEC TSS/8 Basic
for the PDP-8 to my Basic Programming web page:
http://www.nicholson.com/rhn/basic
This brings the count of Basic implementations with source
code to over 50 links or so (minus any dead links).
There's also an archive of Basic games for the PDP-8
here: http://highgate.comm.sfu.ca/pdp8/
IMHO. YMMV.
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rhn A.T nicholson d.0.t C-o-M