c $BBB0 waits for a key and sets SEED based on how long the routine runs for while a key is *NOT* pressed
C $BBB0 preserve HL, DE, BC
C $BBB3 jump to $BBC8 if current player is not human (i.e. quit routine)
C $BBB9 preserve BC
C $BBBA call KEY-SCAN in ROM
C $BBBD restore BC
C $BBBE increment counter (used to set SEED later)
C $BBBF loop back to $BBB9 if no key was pressed
C $BBC4 set SEED to the value of the counter
C $BBC8 restore BC, DE, HL
C $BBCB return