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As the Eagle's landing radar acquired the surface, several computer error alarms appeared. The first was a code 1202 alarm and even with their extensive training Armstrong or Aldrin were not aware of what this code meant. However, they promptly received word from CAPCOM in Houston that the alarms were not a concern. The 1202 and 1201 alarms were caused by an executive overflow in the lunar module computer. As described by Buzz Aldrin in the documentary In the Shadow of the Moon, the overflow condition was caused by his own counter-checklist choice of leaving the docking radar on during the landing process, so the computer had to process unnecessary radar data and did not have enough time to execute all tasks, dropping lower-priority ones. Aldrin stated that he did so with the objective of facilitating re-docking with the CM should an abort become necessary, not realizing that it would cause the overflow condition.
When Armstrong noticed they were heading towards a landing area which he believed was unsafe, he took over manual control of the LM, and attempted to find an area which seemed safer. This took longer than expected, and longer than most simulations had taken. For this reason, there was concern from mission control that the LM was running low on fuel. Upon landing, Aldrin and Armstrong believed they had about 40 seconds worth of fuel to left, which included the 20 seconds worth of fuel which had to be saved in the event of an abort. During training, Armstrong had landed the LLTV with less than 15 seconds left on several occasions and he was also confident the LM could survive a straight-down fall from 50 feet (15 m) if needed. Analysis after the mission showed that at touchdown there were 45 to 50 seconds of propellant burn time left
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