I'm actually a little crushed I couldn't pull this one off, as not only is the Imagination Machine for the APF M1000 all but impossible to find, but this one was loaded to the gills with possibly one of a kind stuff. This was one of the more challenging systems to write about in my book, since there's such a scarcity of information and I only have the videogame portion. In any case, if you didn't get the basic setup in the late 1978 to 1979ish timeframe or for the brief time after in liquidation, you probably weren't seeing one of these and probably won't again: http://cgi.ebay.com/Atari-2600-era-APF-MP1000-IMAGINATION-MACHINE-huge-l...

In any case, here is some more information on the highly collectible setup: http://www.tcp.com/~lgreenf/apfpage.htm