The IBM 104-key Function Key Keyboard was the original design of such buckling spring IBM Function Key Keyboards, beating the larger and more common 122-key versions to market by several months. This 104-key version was made available for the IBM 3290 Information Panel and later IBM 5080 Graphics System. It comes with both an XT-style 10-key function bank to the left of the alphanumeric block and a 24-key "PFxx" function key block above the alphanumeric block. Its nickname "unsaver" describes the oxymoronic nature of this being a space-efficient version of an even-larger keyboard despite the fact these are still as large as full-sized keyboards. These also feature two-setting feet, and their ISO-like layout likely played a role in cementing its usage with the later Model M keyboards.