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4: Keyboard Layout
The keyboard is subdivided into 3 groups: To the left there are 4 round keys, which
we call now “auxiliary keys”. In the middle, next to the auxiliary keys, there is the 3 x
3 group. To the right, the 4 x 4 group is located. The 4 x 4 group consists of 4 rows
with 4 squared keys, the 3 x 3 group consists of 3 rows with 3 squared keys. Each
key of the left located 3 x 3 group operates two functions.
In the following, we describe each row top down and group to group from left to
right.
