WP-34S: Safely copy a graphics register's contents

[Marcus von Cube]

I think I've found the bug:

in unsigned mode Your program seems to be buggy and creates coordinates out of the bounds bounds of the plot object. These values were mistreated as negative values in the range checking code of the plotting commands. I changed the code to use unsigned int instead of int so the range checking now works and the commands with invalid plot coordinates are simply ignored.

You code still doesn't work but the calculator no longer inadvertently modifies the program area. A new build is uploaded to SF. You can try it in the emulator.