An S-Frag is a Standard chip, it has the gray color for the chip. But I don't know what a safrag is or even if it is something in the game.
Amazon.
11922911
The passcode is 11922911.
you have to buy the game
455
you can't
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Check Yai's message board.
it goes to a memory flashback
it unlocks old computer
Go to Megaman's custom screen and go right
I do not think you can, as there would be inconsistencies with the library.