Hi,

> do these suffer the same basic problem that the seti@home did, namely,
> that they requiere ieee754 floating-point, which has to be emulated on a
> vax?

No; RC5-72 (less interesting) and OGR (more interesting) are both integer
heavy.

A discussion of optimisation of the RC5-64 cores in m68k assembly is here
for some background:
http://www.girvnet.org.uk/amiga/dnet.html

John Klos
Sixgirls Computing Labs