Within the MIDAS directory structure you will find a directory ['MIDASHOME'.95NOV .LIBSRC.AGL] that contains all source code for building the lower level AGL library which the MIDAS plot system needs. The code can roughly be divided into device independent routines and the device drivers. Information about the first part can be found in the AGL References manual; the latter is described in the set of small device documents. However, this graphics directory is not relevant for changes in the graphics devices. For that purpose only minor modifications are needed elsewhere. They are in different subdirectories of the MIDAS directory tree.
Below, in a few small sections you will find what to do in order to install a new hardcopy graphics device.