Virtual memory
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.