Gerrit Blaauw

Gerrit Anne (Gerry) Blaauw (born July 17, 1924) is a Dutch computer scientist, known as one of the principal designers of the IBM System/360 line of computers, together with Fred Brooks, Gene Amdahl, and others.

Born in The Hague, Netherlands, Blaauw received his BA from the Delft University of Technology in 1946. In 1947, Blaauw won an exclusive scholarship funded by IBM Chief Executive Officer Thomas J. Watson. After an initial year at Lafayette College in Pennsylvania, Blaauw studied at Harvard University. He received his MA in 1949 and his PhD in 1952 under supervision of Howard Aiken, inventor of the early Mark I computer. At Harvard, he worked on design of the Mark III and Mark IV computers. Blaauw met Fred Brooks while he was working for IBM and visited Harvard, where Fred Brooks was then a graduate student.

After graduation in 1952, Blaauw returned to the Netherlands where he worked at the Mathematical Centre on the second ARRA computer. In 1955 he returned to the United States to work at IBM's Poughkeepsie labs where he worked with Brooks on a number of projects:

Blaauw also designed a revolutionary address translation system, the "Blaauw Box", which was removed from the original System/360 design, but was later used in IBM's unsuccessful proposal to MIT's Project MAC. Subsequently Dynamic Address Translation (DAT) hardware of a somewhat different design was incorporated in the important IBM System/360-67 computer. As implemented on the Model 67, DAT hardware allowed the implementation of some of the first practical paged virtual memory systems – perhaps the first to be commercially successful. The Model 67 was being used in commercial applications by 1968. The earlier Ferranti Atlas Computer was a seminal platform for paging research, but suffered from well-studied performance issues such as thrashing. Virtual memory address translation capabilities similar to those on the S/360-67 were subsequently included in all models of the IBM System/370 computer line that followed.

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