I have a Bally Astrocade and noticed some of the games say 'Bally' along the left side of the front label, having been copyrighted in 1977. Some have 'Astrocade' along the left side of the front label and were copyrighted in 1983. I know the history of the system, just seems i have considerably more of the 'Bally' version... are the later releases less common?