Yes PS1 memory cards work in PS2 systems BUT and this is a big but only for PS1 games not for PS2 games. Because the file systems are different PS1 writes data in blocks whereas PS2 writes in bytes.

The promise of modern technology is that everything gets better, continually, forever. That promise was irrevocably rendered a lie the moment Sony’s PS3 arrived way back in 2006. The PS3 was a fine ...