More precisely, it's "An AVR-based 6502 microcomputer emulator."

Not all MCUs are Harvard architecture though - ARMs, MC68K, 68HC08/11/12/16, MSP430, and PIC32 (basically MIPS) all have a single code+data address space.

The URL made me think it would be about the uzebox AVR-based 8-bit console.

http://belogic.com/uzebox/index.asp

I was thinking about doing something like this as a weekend project. I'm gonna use your and just have fun with it. Very nice work.

Thanks! I'm glad you like it :)

After all the work was done I realized that perhaps would have been a more accessible project if I had developed an Arduino shield instead of an standalone PCB.

You can still build it with an Arduino and a breadboard and the only special component in the list is the SPI SRAM.

I'd say a shield would be ideal. You could probably sell it to get more funds to tinker. :)