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Flight: DENGY

[NES version, Bank 0]

Name: DENGY [Show more] Type: Subroutine Category: Flight Summary: Drain some energy from the energy banks
Context: See this subroutine in context in the source code References: This subroutine is called as follows: * FlightLoop4To16 calls DENGY * LASLI calls DENGY

Returns: Z flag Set if we have no energy left, clear otherwise
.DENGY DEC ENERGY ; Decrement the energy banks in ENERGY PHP ; Save the flags on the stack BNE paen2 ; If the energy levels are not yet zero, skip the ; following instruction INC ENERGY ; The minimum allowed energy level is 1, and we just ; reached 0, so increment ENERGY back to 1 .paen2 PLP ; Restore the flags from the stack, so we return with ; the Z flag from the DEC instruction above RTS ; Return from the subroutine