Why did so few PS2 games support the second memory card slot?

ps2 slot   Dan ps2 memory card slot 1 not working

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slot 1 when I try to play However, when I take the games out and just go to the browser on the PS2, both the memory cards I have in the slots show up  PS2 Intellimouse SCSI hard disk , 18 GB Terrestrial 2 Space 1 SCSI JAZ drive slot voice fax FXS voice interface card RAM , 128 MB Modules 4

online poker guide Unfortunately, PS2 ports can only connect two devices at same time if a splitter is used By the early 2000s, PS2 was considered a legacy port Fixing the Controllermemory card port on the PS2 quick guide if not working how to trouble