Based on this answer:

If I remember correctly; The Slim version supports only the PS/X(1995-1999)version memory cards, not the PSOne(2000-2500) version ones. This could be your problem.

  • Are there actually different versions of the PS1 Memory Cards?
  • What are the difference between them?
  • How do you identify the different versions/revisions?
  • Are there any forward/backward compatibility problems? (I see that the PS2 Slim BC is one)


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