They installed converter tops on all 48 stations.
This stands for Super Magicom. Back in the 1990s, hardware devices called "copiers" or "pro copiers" (like the Super Wildcard or Super Magicom) were used to copy SNES cartridges onto floppy disks. To make these devices work, a 512-byte header was prepended to the actual game ROM. This header contains instructions for the copier hardware.