I got two of these keyboard types. One has a switch on the bottom of it that has "AT/XT" that allows you to use it with either an older XT system, or the newer x86 (286/386/486/Pentium) systems.
Truly rock'n keyboards. REALLY congrats on the score. Although these keyboards are plentiful, they really rock and will soon become obsolete as the newer stuff is plain junk.
Mechanical keys FOREVER!!!