Anybody know much about this device or have a manual? I bought it for $10 off ebay to test serial comm protocols on some of my vintage projects. It works with some caveats: a) If it's off (but plugged in) it loses its memory. Is there a backup battery inside that can be replaced? b) The tape drive may or may not work. Not sure I'll ever really need it. What kind of tapes does it use, and can they be acquired c) I'd be interested to know what the switches on the 18179A do. d) What can I hook the external video interface to? Thanks, -- John.