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
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