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Elite on the BBC Micro

Flight: DENGY (Cassette version)

Name: DENGY [View in context] Type: Subroutine [Compare versions] Category: Flight Summary: Drain some energy from the energy banks
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