(*) Although there is not a single set of rules dictating the number of keys on a keyboard, most companies use the PC keyboard with 104 keys as a defacto standard. US traditional keyboards have 101 keys, while Windows keyboards have 104keys. In general, the number of keys can vary between 80 and110, depending on the type of computer hardware the keyboard is designed for. Laptop and netbook computers tend to have fewer keys. Other keyboard configurations may include more than 104 keys, mainly being the Korean, Japanese, and Brazilian keyboards. IBM/PC keyboards● Original IBM PC Keyboard (1981) – 83 keys ●Updated IBM PC Keyboard (1984) – 84 keys ● AT Keyboard – 84 keys ●AT Enhanced Keyboard – 101 > keys ●US Traditional Keyboard – 101 keys ●Enhanced European Keyboard– 102 keys ● Windows Keyboard – 104 keys ● Windows–based Laptop Keyboard– 86 keys Apple keyboards ●Apple Keyboard with Numeric Keypad – 109 keys ● Apple Wireless Keyboard – 78keys ● Apple MacBook Air laptop – 78keys