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B876: Ball bouncing on the spot: rise or fall
Used by the routine at upd_178_179.
ud_ball_rise_or_fall B876 CALL toggle_next_prev_sprite flip the frame
B879 CALL sound_pitch_from_z a sound pitched by the height
B87C BIT 2,(IX+$0D) rising
B880 JR NZ,ball_up
B882 CALL dec_dZ_and_update_XYZ falling: gravity and move
B885 BIT 2,(IX+$0C) landed: go up, with a thud
B889 JR Z,ud_ball_draw
B88B SET 2,(IX+$0D)
B88F CALL sound_thud
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