Abstract: A keyboard having a side-lighted transparent support plane including a plurality of light-pipes vertically projecting therefrom through an overlying foam over-travel pad. A pair of patterned membrane switch layers, separated by a low density foam spacer, overly the over-travel pad and are positioned relative to a plurality of key-caps slidably mounted to the light-pipes. The sensation of key travel is achieved via the over-travel pad and/or a foam spring mounted beneath the key-caps with switch contact being made intermediate full key depression. An audible click is achieved via overlapping slidably abrasive projections.