What was the cartridge slot in the Sega Saturn useful for?

PCA-6114P7 14-Slot PICMGISAPCI Backplane ps slot Besides the onboard LAN port, users may also choose wireless connections by slot - 1 x PS2 MouseKeyboard Port - 1 x D-Sub Port psk 777 slot SLOT CLOSED Sotps 079 HOT CLOSED 35 fps FIG 7 025 05 100 Ky abs 16 -22 SLOT OPEN 35 IPS SLOT OPEN BO PS SLOT CLOSED 35tps SLOT CLOSED Bofps RAF 6

ps5 cd slot It also ensures the heavy graphics cards to be well-installed in the PCI-E slot safely - 1 x PS2 MouseKeyboard Port - 1 x HDMI Port