Routines
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6d43: Draw an alien sprite to the screen.
Used by the routines at 6a35, 6ab8, 6bf8 and 6cbe.
Input
IX Alien object.
6d43 ld a,(ix+$00) Backup alien direction
6d46 push af
6d47 and $c0 Temporarily change alien direction
6d49 or $03
6d4b ld (ix+$00),a
6d4e call $7232 Update actor X position (using temp direction)
6d51 call $7197 Colourize the sprite
6d54 pop af
6d55 ld (ix+$00),a Restore original direction
6d58 ret
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