Type and series names are not yet understood. “K” probably denotes “keyboard”. A final “M” seems to indicate momentary (with mechanical types), suggesting KAA and KCA for the alternate action equivalents, something yet to be confirmed or refuted. A final “T” seems to indicate tactile (again with mechanical types). The middle letter is not distinct, as KCD (membrane over PCB) clashes with KCT (mechanical). The final letter appears not to be universally schematic with the non-mechanical types.
KSD and KCD do suggest a related designation.
|Type/series||Contact system||Feel||Related to|
|KAM||Mechanical||Linear||Unknown alternate action type|
|KCD||Membrane over PCB||Linear|
|KKQ||Conductive rubber over PCB||Tactile||KPQ, KKR|
|KKR||Conductive rubber over PCB||Linear||KPR, KKQ|
|KPQ||Conductive rubber over membrane||Tactile||KKQ, KPR|
|KPR||Conductive rubber over membrane||Linear||KKR, KPQ|
|KSD||Membrane over PCB||Linear||KSD|
|KSR||Conductive rubber over PCB||Linear||KSR|
This list is currently OEM products and customer-made products only.
|KCT-A89YC||Commodore Amiga 1000|
|KDM-A70YU||Nakajima All typewriter|
|KLM-E17AC||Toshiba PA7354E numeric keypad|
|KLM-E19YC||Toshiba J31TP001 numeric keypad|
|KSD-A46YN||Some Texas Instruments TI-99/4A|
|KSD-A58AU||Some Atari 800|
|KSR-A66YF||Some Commodore VIC-20/VC-20 and most Commodore 64/C64C/C64G (examples)|