These patches add a help screen to your rc file, showing the ASCII characters and whatever ISO character set you are using. (The screen assumes characters 128-159 don't print, so it needs changes to work with Windows's character sets.) The "Meta chars as-is" setting affects the screen's appearance.
Character numbers are given in decimal, but the spacing of the characters is designed to help you work with octal or hex. Call it a compromise.
These patches work on files from the JOE 3.5 source tree. The joerc and joerc.in patches also work on rjoerc and rjoerc.in. There are no patches for the jicerc files.