Not quite storage, but for those who have some old hardware around... like I do
Part of the deal is that I'm working on a DCPU-16 emulator (the emulated system in Notch's up-coming game 0x10c). Because I had the SIPP, and someone hooked a SIMM to a microprocesor similar to what's in the Mega to run Linux on it, I looked at interfacing it into the Mega.
Today, I finished the code, and it works nicely for 256KB SIMM/SIPPs. It's up on: https://github.com/STrRedWolf/RAMtest
I'm tracking my progress towards a DCPU-16 here and will push the code onto GitHub. http://redd.it/uj4le