CHICKEN
(c) 2008-2013, The Chicken Team
(c) 2000-2007, Felix L. Winkelmann
Version 4.8.2
windows-mingw32-x86 [ manyargs dload ptables ]
compiled 06.04.2013  on RIVO-PC (MinGW)

#;1> (define p (##sys#make-pointer))
#;2> (##sys#set-pointer-address! p -1)
#;3> p
#<pointer 0xffffffff>
#;4> (##sys#pointer->address p)
4294967295.
#;5> (eq? -1 (##sys#pointer->address p))
#f
#;6> (eq? #xffffffff (##sys#pointer->address p))
#f