Option '-x6' is useful for debugging because it forces the use of the
easily patchable 'mov #0,x' instead of the quicker 'clr x'.
	Unfortunately, option '-x6' ALSO forces the default output suffix to
be '.a68' instead of '.s'.  So if you expect the '.a68' or '.s' extension,
beware of changing '-x6' for debugging/speedup purposes.
	Note: Apparently(?), '-x29' overrides some of this, forcing the
extension to be '.asm'. If so, then '-x6' would again be available for purely 
debugging/code-compacting purposes.

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