We describe a scalable version of the FLO67 program written in the loop style that is characteristic of Fortran 77. This single scalable source program can be com piled and run on conventional scalar processors, vec tor computers, or massively parallel computers, with respectable performance on all platforms. Initial runs have been on the IBM RISC System/6000, the Sun SPARC, and the Connection Machine supercomputer. This article presents and discusses interesting frag ments of the program, focusing on issues of code scalability.
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