Contents

18 March 1988
Vol 239, Issue 4846

About The Cover

A front view of the 1-gigaflop 64-node Columbia Parallel processor showing the edges of the processor boards and the cables connecting them. The cables form a mesh shaped as a doughnut folded twice onto itself. Each wide, multicolored cable is made up of 20 twisted pairs, carrying 16 data bits and parity at a sustained transfer rate of 16 megabytes per second. See page 1393. [Norman H. Christ, Department of Physics, Columbia University, New York, NY 10027]