C debugger and Franz Lisp query

[utzoo!decvax!ucbvax!menlo70!sri-unix!KENDALL at HARV-10]

A few questions.  Three, actually.

(1) Does anyone know of source-level debugger for C more powerful than Berkley's
    SDB, perhaps a C interpreter?
(2) Has Franz Lisp been ported to any machine besides the VAX?  Are there any
    plans to do so?
(3) Are there any plans for improving Franz Lisp's interface to non-lisp object
    files?  Lisp functions can call functions of other languages, although in an
    unnecessarily rigid way, but to allow functions of other languages to call
    lisp functions such as CONS is very difficult, perhaps impossible.  (Please
    correct me if I am wrong here.)

                                -- Sam Kendall