MGW CONIO keypresses
       +-----+     +-----+-----+-----+-----+  +-----+-----+-----+-----+  +-----+-----+-----+-----+  +-----+-----+-----+
ALT-GR |     |     |00,68|00,69|00,6A|00,6B|  |00,6C|00,6D|00,6E|00,6F|  |00,70|00,71|00,8B|00,8C|  |     |     |     |
ALT    |     |     |00,68|00,69|00,6A|00,6B|  |00,6C|00,6D|00,6E|00,6F|  |00,70|00,71|00,8B|00,8C|  |     |     |     |
CTRL   |     |     |00,5E|00,5F|00,60|00,61|  |00,62|00,63|00,64|00,65|  |00,66|00,67|00,89|00,8A|  |     |     |INTRP|
SHIFT  |INTRP|     |00,54|00,55|00,56|00,57|  |00,58|00,59|00,5A|00,5B|  |00,5C|00,5D|00,87|00,88|  |     |     |     |
       | ESC |     |00,3B|00,3C|00,3D|00,3E|  |00,3F|00,40|00,41|00,42|  |00,43|00,44|00,85|00,86|  |     |     |     |
       +-----+     +-f1--+-f2--+-f3--+-f4--+  +-f5--+-f6--+-f7--+-f8--+  +-f9--+-f10-+-f11-+-f12-+  +Print+-Lock+Break+

       +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+  +-----+-----+-----+  +-----+-----+-----+-----+
ALT-GR |  DD |00,78|00,79|00,7A|  3F |00,7C|00,7D|00,7E|00,7F|00,80|00,81|00,82|00,83|  \  |00,0E|  |00,A2|00,97|00,99|  |     |00,A4|     |     |
ALT    |  60 |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  0  |  -  |  =  |  \  |  08 |  |00,A2|00,97|00,99|  |     |  /  |  *  |  -  |
CTRL   |     |     |00,03|     |     |     |     |     |     |     |     |     |     |  1C |  7F |  |E0,92|E0,77|E0,86|  |     |00,95|     |     |
SHIFT  |  AA |  !  |  "  |£ 9C |  $  |  %  |  ^  |  &  |  *  |  (  |  )  |  _  |  +  |  |  |  08 |  |E0,52|E0,47|E0,49|  |     |  /  |  *  |  -  |
       |  60 |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  0  |  -  |  =  |  \  |  BS |  |E0,52|E0,47|E0,49|  | NUM |  /  |  *  |  -  |
       +-----+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+-----+  +-Ins-+-Home+-PgUp+  +-----+-----+-----+-----+
ALT-GR |  00,0F  |00,10|00,11|00,12|00,13|00,14|00,15|00,16|00,17|00,18|00,19|00,1A|00,1B| 00,1C |  |00,A3|00,9F|00,A1|  | +07 | +08 | +09 |     |
ALT    |         |  q  |  w  |  e  |  r  |  t  |  y  |  u  |  i  |  o  |  p  |  [  |  ]  |       |  |00,A3|00,9F|00,A1|  | +07 | +08 | +09 |     |
CTRL   |  00,94  |  11 |  17 |  05 |  12 |  14 |  19 |  15 |  09 |  0F |  10 |  1B |  1D |   0A  |  |E0,93|E0,75|E0,76|  |00,77|00,8D|00,84|     |
SHIFT  |    09   |  Q  |  W  |  E  |  R  |  T  |  Y  |  U  |  I  |  O  |  P  |  {  |  }  |   0D  |  |E0,53|E0,4F|E0,51|  |00,47|00,48|00,49|     |
       |   TAB   |  q  |  w  |  e  |  r  |  t  |  y  |  u  |  i  |  o  |  p  |  [  |  ]  | RETURN|  |E0,53|E0,4F|E0,51|  |  7  |  8  |  9  |     |
       +---------+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+     |  +-Del-+-End-+-PgDn+  +-----+-----+-----+     |
ALT-GR |           |00,1E|00,1F|00,20|00,21|00,22|00,23|00,24|00,25|00,26|00,27|00,28|00,2B|     |                       | +04 | +05 | +06 |     |
ALT    |           |  a  |  s  |  d  |  f  |  g  |  h  |  j  |  k  |  l  |  ;  |  '  |  #  |     |                       | +04 | +05 | +06 |  +  |
CTRL   |           |  01 |  13 |  04 |  06 |  07 |  08 |  0A |  0B |  0C |     |     |  1C |     | (should be 1E?)       |00,73|     |00,74|     |
SHIFT  |           |  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  |  :  |  @  |  ~  |     |                       |00,4B|     |00,4D|  +  |
       |   CAPS    |  a  |  s  |  d  |  f  |  g  |  h  |  j  |  k  |  l  |  ;  |  '  |  #  |     |                       |  4  |  5  |  6  |  +  |
       +---------+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+---+-+-----+        +-----+        +-----+-----+-----+-----+
ALT-GR |         |     |00,2C|00,2D|00,2E|00,2F|00,30|00,31|00,32|00,33|00,34|00,35|  \  |       |        |00,98|        | +01 | +02 | +03 |     |
ALT    |         |  \  |  z  |  x  |  c  |  v  |  b  |  n  |  m  |  ,  |  .  |  /  |  \  |       |        |00,98|        | +01 | +02 | +03 |     |
CTRL   |         |  1C |  1A |  18 |  03 |  16 |  02 |  0E |  0D |     |     |     |  1C |       |        |E0,8D|        |00,75|00,91|00,76|     |
SHIFT  |         |  |  |  Z  |  X  |  C  |  V  |  B  |  N  |  M  |  <  |  >  |  ?  |  _  |       |        |E0,48|        |00,4F|00,50|00,51|     |
       |  SHIFT  |  \  |  z  |  x  |  c  |  v  |  b  |  n  |  m  |  ,  |  .  |  /  |  \  | SHIFT |        |E0,48|        |  1  |  2  |  3  |     |
       +-------+-+-----+-----+-+---+-----+-----+-----+-----+-----+-+---+---+-+-----+-----++------+  +-----+-----+-----+  +-----------+-----+     |
ALT-GR |       |       |       |                                   |       |       |      |      |  |00,9B|00,A0|00,9D|  |    +00    |     |     |
ALT    |       |       |       |                                   |       |       |      |      |  |00,9B|00,A0|00,9D|  |    +00    |  .  |     |
CTRL   |       |       |       |                20                 |       |       |      |      |  |E0,73|E0,91|E0,74|  |   00,92   |00,93|  0A |
SHIFT  |       |       |       |                20                 |       |       |      |      |  |E0,4B|E0,50|E0,4D|  |   00,52   |00,53|  0D |
       | CTRL  |  WIN  |  ALT  |               SPACE               |ALT-GR |  WIN  | MENU | CTRL |  |E0,4B|E0,50|E0,4D|  |     0     |  .  |ENTER|
       +-------+-------+-------+-----------------------------------+-------+-------+------+------+  +-----+-----+-----+  +-----------+-----+-----+

Doesn't seem to be any way to get Ctrl-@ 00, Ctrl-^ 1E or Ctrl-_ 1F.