🚀 go-pugleaf

I thought I had already posted a query but alas - I cannot find it.  Forgive me
if this is redundant.

I have been using PCBISON.ARC with great success.  This is a port of BISON to
MSDOS by
some UC Berkley Grad Students who - apparently - are no longer accessible by the
net
addresses  they have in the read.me files.

It appears that the original version of PCBISON.ARC had the source in it and
someone - perhaps
they were short on disk space - removed the source and repacked the file. 
(Incidently, is this illegal?) I would love to have the source to a port of
MSDOS BISON.

I tried porting my source to a version that executes on VMS.  After reaching a
point where the
source code would compile on both TURBOC and VAXC with no errors - I though I
was done.  However, the VAX/VMS version worked and the TURBOC version executed a
'berror("edge...")' statement and terminated it.  Hmmm...  And they tell me the
big selling point of C is portability...

Anyway, can someone tell me how to get verion of BISON that works on MSDOS?

(Incidently, I stumbled accross TCBISON.ARC.  This has source - but I cannot
make it work).

                                               Sieg