One step closer. I have both the address bus (orange wires) and data bus (green wires) working and reading. I am able to select the memory address and bank (chip select) and the data bus latches and displays the bits stored. I still have to work through the details of using the universal shift register and timing the memory writes with it so it can read and write bytes to the bus.
Once I have that working I can patch the 6502 emulator to use the external ram instead of the microcontroller ram. Turns out the method I used to select the ram, is similar to how you would do bank switching on an Apple II. Once I have a method to dynamically map memory, I have to decide where the zero page and registers will reside, if I use microcontroller ram, I can’t spy on those items, but it may prove faster. I haven’t even thought about video display or physical I/O