character slot expansion

I know it's at least 40, but I don't want to buy a character expansion if I can't expand it past 40. ... To celebrate the re-release of Zero, character slot expansions are discounted for a limited time!

I/O Expansions ; Number of Total Expansion Slots, 6 ; Expansion Slot Type, SFP ; Shared SFP Slot, Yes ; Number of SFP Slots, 4.

An expansion card plugs into an expansion slot on a computer motherboard to provide additional functionality. Expansion slots include PCI, AGP, AMR, CNR, ISA, ...