Routines
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6A28: Adjust the photon bolt left or right
Used by the routine at 663D.
6A28 LD A,($5DDF) Get current direction
6A2B LD HL,$5DD8 Get photon bolt screen offset
6A2E ADD A,(HL) Adjust accordingly
6A2F LD ($5DD8),A Set back
6A32 RET
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