Editing BTC 5100 (section)

==Description==
The keyboard is 14.5 [[unit]]s wide. The top row of keys—including the function keys—are all reduced in size, to approximately 85% of their normal size (fitting 17 keys across the keyboard).

The various key sizes are as follows:

* Space: 5 u
* Fn, Ctrl, Alt: 1.5 u each
* Backspace: 1.5 u
* Enter: 1.75 u
* Right Shift: 1.25 u
* Function row: 0.853 u

Due to the compact size of the keyboard, the [[keyboard controller]] resides on a daughterboard placed underneath the switch PCB.

The date of introduction is not known. The capacitive version depicted below is dated 1992. The version 1.00 manual for the BTC 5100C is dated 17th of February 1997, suggesting that the capacitive version was replaced or complemented by the conductive version in 1997.