On - CHIP DIRECTORY - site you can find everything . Dontronics and Scott
Edwards sell a ready made i/o expander, but 4094, 4014, MM5450 and MM5480 are
less expensive.
Pay attention to 4014 use it JAM inputs and register contents. You must clean
register before
load it with inputs.

                       Claudio Rachiele IW0DZG