Routines
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633A: Move a plane or tank across the screen if appropriate
Used by the routines at 62CB and 663D.
633A LD A,($5DCB) Is the enemy being blown up?
633D BIT 7,A
633F JR NZ,$6359 Skip setup if so
6341 BIT 5,A Should an enemy appear now?
6343 RET NZ Return if not
6344 BIT 0,A Is this a tank?
6346 JR NZ,$637C No, it's a plane, move forward
6348 LD A,($5DCC) Get frames until a bonus enemy should appear and decrement it
634B DEC A
634C JR NZ,$6355 Move forward if it's not time yet
634E LD HL,$5DCB
6351 SET 0,(HL) Set that a bonus enemy is on screen
6353 LD A,$32 Reset number of frames before bonus enemy can appear again
6355 LD ($5DCC),A
6358 RET
6359 LD A,($5DCC) Get number of frames before bonus enemy should appear
635C LD HL,$6443
635F LD (HL),A
6360 DEC A
6361 LD ($5DCC),A
6364 RET NZ
6365 LD (HL),$07
6367 LD A,$32
6369 LD ($5DCC),A
636C LD A,$20
636E LD ($5DCB),A
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