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Harvey: I have to ask whether this effort is worth the trouble. Can the desired results be achieved by some other approach? We already "support" two modes on the SX4, a "classic" cray emulation (Cray float) CFLAGS -hfloat2 -hint64 FFLAGS -float2 and a "normal" (IEEE float) SX4 (No special flags => float0). What your client is trying to do is make the SX4 "like" a T3E or something, which isn't in the design space supported by NEC in their flag combinations, and is therefore outside the box. From the point of view of the calculations, the same results can be achieved, more portably, by using the appropriate f90 type specifiers as appropriate in the user code. -glenn