to follow up on that, this is a distab entry for an RF72 from an Ultrix
system:

rf72|RF72|DEC RF72 Winchester:\
        :ty=winchester:ns#50:nt#21:nc#1861:\
        :pa#32768:ba#8192:fa#1024:\
        :pb#190608:bb#4096:fb#1024:\
        :pc#1954050:bc#8192:fc#1024:\
        :pd#300708:bd#8192:fd#1024:\
        :pe#300708:be#8192:fe#1024:\
        :pf#207658:bf#8192:ff#1024:\
        :pg#921600:bg#8192:fg#1024:\
        :ph#809074:bh#8192:fh#1024:


happy hacking!