I found out about something interesting on the net the other day.
http://patent.womplex.ibm.com/
This site is an archive of US patents from 1971 to present. Of special
interest to us is #4623147: Process for Displaying a Plurality of
Objects on a Video Screen. This patent describes how to display multiple
copies of sprites on a 2600. A lot of the info is right out of the Stell
Programmers Manual, but there appears to be a lot of other info there (I
have not had a chance to read it through yet).
There is also alot of other interesting information in the patents, if
you are willing to search through the archives to find it.
Dan Boris
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