David wanted to share a printer between several Apple II computers. He used an Pacemark iiEasy Print system. But he needed a small secondary system to make everything work. The iiEasy Print is connected to a Commodore 64. The C64 is used as a controller for the printer buffer. You can read more about this project on his blog.
Website: http://jbevren.wordpress.com





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Actually the effort here is reverse engineering the Pacemark card. The c-64 in the picture is connected to the CPU socket to drive the address bus while detecting the other chips’ memory maps.
Hi, I designed that product years ago. Still remember writing the code :)