memscroller(1): scrolls dump of its own RAM ...

NAME

-window: Draw on a newly-created window. This is the default.
-root: Draw on the root window.
-install: Install a private colormap for the window.
-visual visual: Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.
-color: Render each three bytes of memory as R, G, B. This is the default.
-mono: Render each byte of memory in shades of green.
-ram: Read from the process's address space. This is the default.
-random: Instead of reading from memory, generate random numbers.
-filename file: Instead of reading from memory, read from the given file until EOF, then re-open it. If you have permission, /dev/mem is an interesting choice here. (Note that /dev/null won't ever display anything, because it returns EOF without ever returning any data.)
-delay microseconds: How much of a delay should be introduced between steps of the animation. Default 100000, or about 1/10th second.

DISPLAY: to get the default host and display number.
XENVIRONMENT: to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.