#14 Monkey Academy sometimes hangs when starting game

[Maarten ter Huurne]

Monkey Academy uses the BIOS memory area as a source of random data. However, since C-BIOS does not use the whole area yet, some parts are filled with zeroes. This leads to the same "random" value being produced every time and in some cases the game will retry until it gets something in a certain range. So it is possible to get an infinite loop while the game tries to get a suitable random value.

See routine at #730B.