REAL*16 wanted

[RHBNC]

SEveral of my colleagues run large numerical programs in both Pascal and
Fortran, and they want to be able to work to higher precision than the pc
and  f77  compilers normally provide (which I believe is Real*8 = 64
bits). Please does anybody have any suggestions how this might be
possible? Do there exist public-domain compilers? 

Our machines are  sun 3/60, 68881 coprocessors, sun-OS3.5,  I assume the
compilers are the standard Unix ones.

mark