Maryland uses mostly Mandrake Linux (10.1 as of this writing, but switching to Centos 5.1 as we speak) on IA-32 as well as IA-64 type machines. A few Solaris machines are still present, but Miriad is not actively maintained on them (though available upon request).
Maryland also uses astromake, which allows you to (interactively) load various packages in your shell. Although this comes with an obvious flexibility, the danger is that loading packages in a certain order could render your interactive shell useless, and loading multiple versions of miriad can make commands from the older version to peek through the new one and cause unexpected results. Use with caution. Example:
% source /n/astromake/astromake_start % astroload ds9 % astroload miriad or: % astroload -v daily miriad % astroload -v 64 miriad
Local MIRIAD maintainer: Peter Teuben.