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Re: vbl tasks

For a variety of reasons, it's generally not possible to write code that 
executes at interrupt time in Macintosh Common Lisp.  (One reason is that
MCL code assumes that certain other registers - as well as A5 - have
well-defined values on function entry, and the callback mechanisms (DEFPASCAL
and DEFCCALLABLE) have no way to properly initialize these registers at 
interrupt time.)