The third iteration was the Natural Keyboard Pro, introduced in June 1999 at a retail price of US$74.95 (equivalent to $113 in 2018). ^ a b Hotkey functions are mainly integrated via F-lock on F1- F12, and a few dedicated buttons are also provided.^ Nonstandard 2-column, 4-row layout columns (from left to right) are Del (double height Del)/ Insert key+ Ins and Home/ End/ PgUp/ PgDn.^ Separate number pad has three additional buttons above top row: Num Lock, Calculator, and ← Backspace.^ a b Wireless receiver connects via USB.^ Adds 16 hot keys 4 frequently used symbols duplicated above numpad.^ Wireless receiver terminates in USB bundled with PS/2 adapter.Ins moved to PrtScrn as the function under standard F-Lock functioning (i.e., when F1– F12 are active).
^ Nonstandard 2-column, 3-row layout columns (from left to right) are Home/ Del (double height Del) and End/ PgUp/ PgDn. ^ Adds 17 hot keys Ins integrated with Print Screen. ^ Adds 19 hot keys, two of which are programmable using IntelliType Pro software. ^ Nonstandard 2-column, 3-row layout columns (from left to right) are Home/ End/ Del and PgUp/ PgDn/ Ins. ^ a b c d Conventional 3-column, 2-row layout columns (from left to right) are Ins/ Del, Home/ End, and PgUp/ PgDn. ^ a b Standard 101-key QWERTYkeyboard layout with the addition of two Windows keys and a contextual menu key on the spacebar row. Split spacebar two dedicated hotkeys, both launch Calculator. ĭesigned by Ziba Design and manufactured by Key Tronicį-Lock to toggle from standard software-defined Fn functions In general, ergonomic keyboards are designed to keep the user's arms and wrists in a near-neutral position, which means the slant angle (the lateral rotation angle for the keys in each half relative to the axis of the home row in a conventional keyboard) is approximately 10 to 12.5°, the slope (the angle of the keytop surfaces starting from the front edge closer to the user towards the top of the keyboard, relative to a horizontal plane) is -7.5°, and the tent or gable angle of each half (the angle of the keytops from the center of the keyboard towards its left and right edges, relative to the horizontal desk surface) is 20 to 30°.
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