No computer left behind - That's my motto! And just to prove it here is the first public outing of the circuit for EinSDein. I just thought of that name, snappy, eh? :D
Click an image to embiggen it.
It's the usual suspects. A Pic18F452x class chip with its wonderful PSP, and a Xilinx XC9500 class CPLD. The whole thing runs at 3.3v so there's no need for any clumsy level conversion when accessing the SD card. The CPLD is 5V tolerant, which is nice.
It will run a modified hybrid firmware from ZXpand and its Acorn Atom progenator - AtoMMC.