Broken .TM in Berkeley 4.2 'tmac.s'

[cosell at BBN-LABS-B.ARPA]

From:  Bernie Cosell <cosell at BBN-LABS-B.ARPA>

Berkeley usurped '.TM' to be 'thesis mode', whereas the original
'.TM' was 'Technical memo'.  Our 4.2 system now has a /usr/doc
half full of troff sources that we can't re-troff because the
'.TM' screws up the format (Bell thought TMs should be single
spaced, Berkeley thinks TMs should be double spaced).

Does anyone know if the Berkeley folk were thoughtful enough
to provide some way to make '.TM' work in the original 'bell' way?
Or is there some known 'improvement' to the macros to restore the
old way it worked?

Thanks
   /Bernie
    cosell at bbn-unix