Routines
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735E: Check shell initialization condition
Alternative shell initialization when bit 4 is set. Checks if tank can fire based on shell active state and position.
check_shell_init_condition 735E LD A,($5EF2) If TANK_SHELL_ACTIVE, cancel shell via cancel_and_remove_shell.
7361 CP $01
7363 JP Z,cancel_and_remove_shell
7366 PUSH BC Push BC, check X position sign bit, invert if positive via invert_coordinate_sign.
7367 LD A,C
7368 BIT 7,A
736A CALL Z,invert_coordinate_sign
736D RES 7,A
736F SRL A
7371 SRL A
7373 SRL A Shift right 4 times to get upper nibble.
7375 SRL A
7377 LD B,A
7378 LD A,D
7379 AND $40
737B ADD A,B Combine with orientation, pop BC, continue to fire shell.
737C POP BC
737D JP tank_fire_shell_entry
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