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+Around 2003, the Atari 2600 vcs.h file changed greatly, in ways that
+make it somewhat incompatible with the older vcs.h. For instance,
+Thomas Jentzsch's River Raid commented source no longer assembles
+correctly with the new vcs.h.
+
+If you need it, there's a copy of the old vcs.h from around 2000 included
+in the dasm package as: /usr/share/dasm/machines/atari2600/vcs.h.old
+
+New projects should use the new vcs.h; the old one exists only for
+backwards compatibility with old sources.