DALTON can be run on a variety of systems running the UNIX
operating system. The current
release of the program supports
Convex , Cray-UNICOS ,
Cray-T3D/E ,
IBM-AIX , Intel Paragon ,
SGI-IRIX , SUN ,
Linux running GNU-f77 and partially also
DEC-Alpha 
. We
furthermore note that
response calculations involving the spin-orbit
operator only will work on Convex, IBM-AIX and SUN computers.
The program is written entirely in FORTRAN 77 , with machine dependencies isolated using C preprocessor directives . All floating-point computations are performed in 64-bit precision, but if 32-bit integers are available the code will take advantage of this to reduce storage requirements in some sections.
The program should be easily portable to other UNIX platforms : indeed, the Convex, or IBM-AIX versions may very well work without change on typical 32-bit UNIX workstations. Users who port the codes to other platforms are encouraged to communicate any required changes in the original source with the appropriate C preprocessor directives to the authors.