PDP-9
Software
Software
--------

The system came with an OS that functions as single\-user keyboard monitor, called ADSS (ADvanced Software System). DECsys provided an interactive, single\-user, program development environment for [Fortran](/wiki/Fortran "Fortran") and assembly language programs.

Both FORTRAN II and FORTRAN IV were implemented for the PDP\-9\.

[MUMPS](/wiki/MUMPS "MUMPS") was originally developed on the PDP\-7, and ran on several PDP\-9s at the [Massachusetts General Hospital](/wiki/Massachusetts_General_Hospital "Massachusetts General Hospital").


Which programming languages are supported by DECsys?