IBM Advanced Computer Systems project: Difference between revisions

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At a steering meeting in August 1965, Paley, Bertram, and Schorr gave presentations on the design so far. The machine would use a 48-bit word length, as that was the standard for scientific computing. The machine would have a clock cycle time of 10-nanoseconds, about 10 times faster than the 6600, with six or seven internal cycles per clock. The [[arithmetic logic unit]]s (ALUs) that performed most of the mathematics would be [[Pipeline (computing)|pipelined]], as in the 6600, and it would dispatch multiple instructions per cycle. [[Branch (computer science)|Branching]] performance would be improved with a buffer that would begin executing both sides of the branch.{{sfn|Smotherman|Sussenguth|Robelen|2016|p=61}}
 
Harwood Kolsky gave a presentation on the various competing designs, while [[Gene Amdahl]] and [[Chen Tze-chiang]] talked about their work on the Model 92. Kolsky had worked at Los Alamos for seven years before joining the Stretch project, while Amdahl had left IBM after being passed over to lead Stretch development but returned to IBM Research in 1960 and joined the Project X effort.{{sfn|Smotherman|Sussenguth|Robelen|2016|p=61}} In late 1964, Amdahl took a teaching position at [[Stanford University]], butwanting into return to the west coast. In January 1965 he was named an [[IBM Fellow]] for his work on the Model 92. As a Fellow, Amdahl was entitled to work at any IBM facility of his choosing and decided to join ASC at the invitation of Bob Evans.<ref name=interview>{{cite journal |journal= IEEE Design and Test of Computers |date=April 1997 |title=Interview with Gene Amdahl}}</ref>{{sfn|Smotherman|Sussenguth|Robelen|2016|p=63}}
 
Even at this early meeting, Amdahl made the argument that it would make much more sense to make the ASC compatible with the 360, as had been the case with Project X. While it might run marginally slower than the ACS, due largely to it using a 32-bit word and having 16 registers instead of 32 48-bit ones, it would offer customers of the Model 92 an upgrade path to much higher performance and leverage all of the software and especially their [[compiler]] technology developed for that machine.{{sfn|Smotherman|Sussenguth|Robelen|2016|p=61}}
 
===Design matures===