As far as instructions, they do not appear to be much.

Dark Castle - front and back of one sheet of paper

Beyond Dark Castle - front and back of one sheet of paper, separate 1/2 page with a compatibility chart

Apache Strike - front and back of three sheets of paper, separate 1/2 page with a compatibility chart

Shadowgate - actually has a booklet! 16 Pages, plus a reference card. Unfortunately, Disk 1 is copy-protected.

All of them had registration cards. When I get the desk cleaned up I'll scan the docs.