XD-1 evaluation, 20 May 1955

Abstract

The CD side of the drums was systems tested and was now part of the XD-1. However, as anticipated by the drum system engineers, the drums performed very poorly during the evaluation tests. The percentage of usable assigned time was 73% during the time assigned to MIT and 74.5% for the time during which IBM was running reliability programs and utility programs. Most of the low margins found during the last evaluation were improved. In general, the reliability of the central computer had improved slightly since the last evaluation made.