Routines
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42670: Use Energy
Used by the routines at FireWeaponB and GetRobotSpeed.
Takes an amount of energy out of the battery. If there is not enough then the battery is empty and the robot is destroyed, along with all of the enemies. The energy is free once every sector has been either activated or destroyed.
Input
DE Energy to use
Output
F The carry flag is set if there was not enough energy
UseEnergy 42670 LD A,(38488) Fetch the number of sectors that have been activated.
42673 LD L,A Keep the number of activated sectors.
42674 LD A,(38489) Fetch the number of sectors that have been destroyed.
42677 ADD A,L Add the number that have been activated...
42678 LD (38490),A ...and store the number of sectors that have been dealt with.
42681 CP 9 Jump if some sectors have not been dealt with.
42683 JR NZ,UseEnergy_Take
42685 AND A Otherwise clear the carry flag and return, as the energy is free.
42686 RET
UseEnergy_Take 42687 LD HL,(38458) Fetch the energy of the battery.
See Infinite Energy.
42690 AND A Subtract the energy that is to be used.
42691 SBC HL,DE
42693 JR C,UseEnergy_Empty Jump if there is not enough energy.
42695 LD (38458),HL Otherwise store the new energy...
42698 RET ...and return.
UseEnergy_Empty 42699 LD HL,0 The battery is empty.
42702 LD (38458),HL Store that.
42705 PUSH AF Save the carry flag.
42706 LD A,56 Turn the robot into smoke...
42708 LD (38544),A ...by setting its type to 56.
42711 XOR A Clear the controls...
42712 LD (38437),A ...so that nothing is fired.
42715 CALL ExplodeEnemies Turn all of the enemies into smoke using ExplodeEnemies.
42718 POP AF Restore the carry flag...
42719 RET ...and return.
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