BBC Master keyboard layout
                                              ==========================

         +---++---++---++---++---++---++---++---++---++---+     +---+      +---+     +---++---++---++---+
         |   ||   ||   ||   ||   ||   ||   ||   ||   ||   |     |   |      |   |     |   ||   ||   ||   |
         | f0|| f1|| f2|| f3|| f4|| f5|| f6|| f7|| f8|| f9|     |BRK|      | UP|     | + || - || / || * |
         +---++---++---++---++---++---++---++---++---++---+     +---+      +---+     +---++---++---++---+
  +---++---++---++---++---++---++---++---++---++---++---++---++---++---++---++---+   +---++---++---++---+
  |   || ! || " || # || $ || % || & || ' || ( || ) ||   || = || ~ || | ||   ||   |   |   ||   ||   ||   |
  |ESC|| 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 0 || - || ^ || \ ||LFT||RGT|   | 7 || 8 || 9 || # |
  +---++---++---++---++---++---++---++---++---++---++---++---++---++---++---++---+   +---++---++---++---+
  +------++---++---++---++---++---++---++---++---++---++---++---++---++---++---+     +---++---++---++---+
  |      || Q || W || E || R || T || Y || U || I || O || P ||   || { || ` ||   |     |   ||   ||   ||   |
  |  TAB || q || w || e || r || t || y || u || i || o || p || @ || [ || _ ||DWN|     | 4 || 5 || 6 ||DEL|
  +------++---++---++---++---++---++---++---++---++---++---++---++---++---++---+     +---++---++---++---+
 +---++---++---++---++---++---++---++---++---++---++---++---++---++---++--------+    +---++---++---++---+
 |CAP||   || A || S || D || F || G || H || J || K || L || + || * || } ||        |    |   ||   ||   ||   |
 |LCK||CTL|| a || s || d || f || g || h || j || k || l || ; || : || ] || RETURN |    | 1 || 2 || 3 || , |
 +---++---++---++---++---++---++---++---++---++---++---++---++---++---++--------+    +---++---++---++---+
+---++------++---++---++---++---++---++---++---++---++---++---++------++---++---+    +---++---++---++---+
|SHF||      || Z || X || C || V || B || N || M || < || > || ? ||      ||   ||   |    |   ||   ||   ||   |
|LCK|| SHIFT|| z || x || c || v || b || n || m || , || . || / ||SHIFT ||DEL||CPY|    | 0 || . || RETURN |
+---++------++---++---++---++---++---++---++---++---++---++---++------++---++---+    +---++---++---++---+
                  +--------------------------------------+
                  |                                      |
                  +--------------------------------------+
Notes:
   Top line: Shift+key
Bottom line: unshifted key