What were these memory slots used for? Obviously memory stick duo was for psp, but what about the SD and CF ones? I didn't even know what CF was until now :
PS3 Flash Memory Card Support - YouTube
Duracell's Extender is Everything You Loved About Your Old PS3
Super slim PS3 SSD upgrade? No bracket so I jammed PSone memory card under it. : r/PS3
Sony PlayStation 3 (120GB) - Review 2011 - PCMag UK
Datel creates PS3 add-on with extra USB ports, memory slot | VG247
Restored Sony PlayStation 2 Slim Console Silver and 8MB Memory Card (Refurbished) - Walmart.com