With a second multitap, up to eight controllers and memory cards can be plugged at once.
[1] The PlayStation Multitap was originally available in gray (SCPH-1070 U) to match the original console's color; however, it was later re-released in white as well (SCPH-1070 UH) to match the colors of the later PS one redesign.
Both versions are compatible with the original PS one, as well as all models of the PlayStation 2 prior to the SCPH-70000 series.
Both versions of SCPH-1070 will only function with original PlayStation games, while multiplayer PS2 games required a separate multitap, the SCPH-10090.
[2] PlayStation 2 consoles after the SCPH-70000 series require the SCPH-70120 multitap, which is compatible with both PS and PS2 software.