Version 1.0 of the memory expansion board has been built and all preliminary tests indicate it is good to go. As seen in the photographs, the first test configuration has a 2732 EPROM, two 2764 EPROMs, and a 6264 RAM. For more complete testing, I need to do more mixing and matching and use all versions of EPROMs up to the 27256 in various combinations. In this test I have the two 2764s mapped at the same address space in different pages and that works well. Some nice features on this board even if I do say so myself. The addressing seems confusing at first but I think it is straight forward once explained. I guess we will see when I start to get feedback on the [so far non-existent] documentation.
As a first step in the documentation, I did start to put together the cheat sheet for the board to help keep track of how it is configured.