Was the Turbo the first system with any kind of memory card?
Probably not, but it sure was an early adopter...
There might be unofficial memory units for the NES as well, I have heard about them but never seen or held one.
The SNES had a 3 slot memory card (box with tails) which plugged into the controller port.
The Genesis also had a memory card, but I am pretty sure that came out after the turbo.
What year did they release a memory card for the PC-E/Turbo?