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A final review was performed in April, but this was brief and seemingly already decided. In May, IBM announced the ACS-1 would be cancelled and the AEC/360, to be known as the ACS-360 from that point, would move forward. Although Amdahl's competing design had much to do with this, it was not the only reason. Amdahl had also argued that the $15 million would better be spent on improving the operating systems on the 360, which would improve the entire lineup, not just the AEC. But perhaps the most serious blow to the ACS was the continued success of the 360. In January 1968, [[NASA]] had taken delivery of a 360 Model 95, which IBM described as "the fastest, most powerful computer now in user operation."{{sfn|Smotherman|Sussenguth|Robelen|2016|p=67}} Although the ACS would have outperformed the Model 95 by a wide margin, by this time Watson Jr. was considering withdrawing from the supercomputer market entirely.{{sfn|Conway|2011|p=29}}
Many of the retrospective articles on the ACS project note that the original machine would have been a world leader. Conway notes that "In hindsight, it is now recognized that had the ACS-1 been successfully built, it would have been the premier supercomputer of the era."{{sfn|Conway|2011|p=20}} The decision to cancel the original design rested mostly on the cycle counts which had not been tested as the simulator she had developed had not been
===Cancellation===
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