DI340 takes an image file as its only argument and
displays it on the E&S PS340 in Jackson 1306 using the Ethernet. (Note:
this display location is determined by a
PATTCH subroutine call
in the program). Because the display is slow, the program displays every
third scan line so that the overall appearance of the image can be seen
N.B. This program only works on a VAX/VMS system.