Aye the old good R4 which ended with firmware version 1.18
Ah that was times...it was first (or one of first) slot-1 flashcards without need of flashme or such combinations... Slot-In and go ^_^
I still have it and it works pretty good for storing all my homebrew there because there was a time when Acekard couldn't play all..."methods" of sound (PSG as one of those) and I had to use R4 for it (there was some improvements going in libraries or something). Today I believe all problems were solved already but it's nice to have one big place just for homebrew