BBC Keymapping
                                  ==============

+==+====+====+====+====+====+====+====+====+====+====+=====+======+====+====+====+====+
|  | x0 | x1 | x2 | x3 | x4 | x5 | x6 | x7 | x8 | x9 | xA  |  xB  | xC | xD | xE | xF |
+==+====+====+====+====+====+====+====+====+====+====+=====+======+====+====+====+====+
|0x|    |    |    |    |    |    |    |    |    |Tab*|     |      |    |Retn|    |    |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|1x|    |    |    |    |    |    |    |    |    |    |     | Esc  |    |    |    |    |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|7x|    |    |    |    |    |    |    |    |    |    |     |      |    |    |    | Del|
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|8x| F0 | F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8 | F9 |     | Copy | <- | -> | Dn | Up |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|9x|sF0 | sF1| sF2| sF3| sF4| sF5| sF6| sF7| sF8| sF9|     | sCopy| s<-| s->| sDn|sUp |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|Ax|cF0 | cF1| cF2| cF3| cF4| cF5| cF6| cF7| cF8| cF9|     | cCopy| c<-| c->| cDn|cUp |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|Bx|scF0|scF1|scF2|scF3|scF4|scF5|scF6|scF7|scF8|scF9|     |scCopy|sc<-|sc->|scDn|scUp|
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+
|Cx|    |    |    |    |    |    |    |    |    |    |Break|      |    |    |    |    |
+--+----+----+----+----+----+----+----+----+----+----+-----+------+----+----+----+----+

Top-bit-set keypresses are translated with *FX221-*FX228. TAB inserts the keypress
defined with *FX219.