Reference:     J. Appl. Cryst. (1985), 18, 51-53.

*.FOR        - source code for GX programs.

GXLIB.FOR    - subroutine library (see GX manual).

GXGLIB.FOR   - 'XY' subroutine library (see GX manual).

CALCOMP.FOR  - subroutines to interpret CALCOMP calls as GKS calls (useful
               only if you have GKS); to use the workstation screen as a GKS 
               output device, use an open workstation call such as:

               CALL GKS$OPEN_WS(1,'SCREEN',231)

               Then before running the program assign the logical device 
               "screen" as follows:

               $ assign/user DECW$DISPLAY SCREEN
               
ORTBLD.COM   - linking instructions when using VAX GKS (by way of example).

DATABANK.DAT - the file referred to on p.5 of the GX manual, under 'SFAC'.
               ORTEP uses the covalent radii to establish atom connectivity.
               
GX.COM       - a VAX/VMS command procedure for running the GX programs, 
               including ORTEP (by way of example).

*.MA         - sample input (see GX manual).