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Old 13 February 2021, 23:40   #464
DanScott
Lemon. / Core Design
 
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Join Date: Mar 2016
Location: Tier 5
Posts: 1,213
Yes, they are using one playfield and hardware sprites to construct the backgrounds, leaving one playfield free for all foreground bobs (players and effects etc..)

To move the ship up and down, they only need to adjust the bitplane pointers
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