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Flight: DENGY

[BBC Micro disc version, Docked]

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 Variations: See code variations for this subroutine in the different versions References: No direct references to this subroutine in this source file

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 P%+5 \ 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 PLP \ Restore the flags from the stack, so we return with \ the Z flag from the DEC instruction above RTS \ Return from the subroutine