Hi, i got one A500 with extra memory. It says A501. when i opne the trap door, it has a metal cover, i cannot see it, i would have to remove all the metal stuff to access to the memory, it still has the original Commodore seal. I didn't remember to see A500 with 1 MB ram inside metal shell like this. It's not a 500+, it's an old A500. Did they release a lot of them like this?