BBC MOS 0.xx Keymapping
                                          =======================

+==+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|  |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  A  |  B  |  C  |  D  |  E  |  F  |
+==+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|0x|     |     |     |     |     |     |     |     |     | Tab |     |     |     |Retrn|     |     |
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|1x|     |     |     |     |     |     |     |     |     |     |     | Esc |     |     |     |     |
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|7x|     |     |     |     |     |     |     |     |     |     |     |     |     |     |     | Del |
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|8x|     |     |     |     |     |     |     |Copy | <-  | ->  | Dn  | Up  |     |     |     |     |
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|9x| F0  |  F1 |  F2 |  F3 |  F4 |  F5 |  F6 |  F7 |  F8 |  F9 |Break|     |     |     |     |     |
+--+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

The base and number of soft keys can be changed by setting internal variables. By default the keyboard
driver treats all &9x as soft keys.