Routines
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7387: Invert shell coordinate delta
Subtracts E×4 from C for left-facing tank shell trajectory adjustment.
Input
C Current X position
E Delta value
Output
C Adjusted X position
invert_shell_coordinate_delta 7387 LD A,C C = C - E×4 (SUB E four times).
7388 SUB E
7389 SUB E
738A SUB E
738B SUB E
738C LD C,A
738D RET
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