Results from (round (* 1.0e300 1.0e300)) (to avoid problems with Schemes that don't understand the syntax +inf.0):
Returns the argument: Racket, Gauche, MIT, Chicken (with and without the numbers egg), Bigloo, Guile, Kawa, SISC, SCM, Chez, Vicare, Ypsilon, Mosh, IronScheme, NexJ, STklos, KSi, Shoe, BDC, Rep, Schemik, Elk, VX, Spark, Dfsch, Inlab, Sagittarius
Error: Gambit, Scheme48/scsh, SISC, S7
Returns 1.0e+600: Scheme 9
Returns 0: RScheme
Returns smallest fixnum: XLisp, Sizzle
Crashes: UMB
No round: TinyScheme, Llava, FemtoLisp
No flonums: SigScheme, Dream, Oaklisp, Owl Lisp