You plug bits of circuit board into slots to gain extra functionality.
expansion slot
It is used to add an internal Graphics card on the AGP slot
MCA
MCA
The now obsolete AGP slot was used solely for video. The current slots used for video, the large x16 PCIe connectors, can also be used for general PCIe expansion cards. Sitting in shelf above my head, I still have some PCI and ISA slot video cards: using a general-purpose expansion slot for video is the standard way, and a dedicated graphics expansion slot was a short-term abberation.
To play 3 or 4 players on Hydro Thunder you need a Expansion Pak in your expansion slot.
Heat expansion.
An AGP video card.
pcs
PCI
pci express or AGP
Peripheral component interface PCI slot or expansion slot can be used as plug and play if an internal USB card supporting USB version 2.0 is installed in it