Looking to add a few external buttons to Mach3...what are some simple options? Second parallel? Serial cable?

They way I am working now, I only need three buttons, Touch Off Z, Cycle, and Stop. Of course once I have these I would want more! Like maybe jog buttons! Looking to get started simply at first...I dont think I need a full pendant, and I can also use the XBox controller...still would like a small physical panel with three or four buttons to get me started....

Advice/opinions are greatly appreciated

Leslie