REU 17xx emulation

[pmandes]

I wonder if it would be possible to emulate the REU expansion.

[frntc]

unfortunately emulating a REU is not possible. This would also require writing addresses to the C64-bus, and the RPi doesn't have enough GPIOs to do this in addition to providing the other functionality. In principle a REU emulation is not difficult at all, but would require different glue logic.