IBM 3151 terminals (Which keyboard?)

I've recently received a small pile of IBM 3151 terminals. All seem functional. I also have a pile of IBM keyboards, some of which look like they may fit the terminals. The two keyboard types of interest (IE the ones with modular plugs) are: A model "1397952" -- this one has an 8-wire modular plug. When plugged into one of the terminals, it will say something on the order of "PROBLEM IN KEYBOARD" A keyboard that's not clearly marked at all, but the longest identifier-looking number on the tag is 122RK33S(or 5)-30S(or 5)E-J. This has (I think) a 6-wire modular plug. It has a panel of dip switches near where the cord connects. When plugged in this one reports the (more interesting) error of "PROBLEM IN VIDEO ELEMENT OR KEYBOARD" (My guess it it's in the keyboard...) Both keyboards have 24 "function" keys, and a panel of odd keys to the left of the alpha section. So does anyone know what these particular keyboards actually go with? Can I maybe change the switch settings in the latter keyboard, and get it to work with these terminals? Does anyone know what the switches even do? Why don't the terminals report odd numeric errors? "PROBLEM IN KEYBOARD" is almost understandable ;) Regards, Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '