Just tested and everything is in good working condition with no known issues. It has sat in a drawer for most of the last 30 years, only pulling it out occasionally to transfer old files.
Includes keyboard, mouse, cables, some software, etc. Everything you see in the pictures. So far as I know the cables are original too but I'll include more modern versions.
I don't have the monitor but I am including a cable that will allow you to hook this up to any monitor with a VGA hookup (as seen in pictures).