The Lunar Module had an abort mode where the crew basically just had to push the ABORT button on the control panel, and the ascent stage would detach from the descent stage, followed by the ascent stage engine igniting to take them away from the descent stage and -- hopefully -- ultimately back into lunar orbit.
That would have worked nicely during the descent, when gravity would have done a good job of getting the descent stage out of the way, but the recent discussion on not being able to take off after landing made me curious. What would happen if, after landing, the crew got into (or remained inside) the LM, performed all relevant pre-launch steps, and pushed the ABORT button? We are of course assuming here that one of the steps performed would be to arm the ascent engine.
Would the LM's computers (PNGS or AGS) have allowed such an "abort"? Or was there some lock-out that prevented aborting after touchdown? (I'd like to think that aborting was one of the options available to the crew with the fewest things that could go wrong.)
How would it be similar or different compared to a normal ascent launch? Are there scenarios where one approach might have worked for getting them off the lunar surface, but not the other?