Motherboard Expansion Slots - CompTIA A+ 220-1001 - 3.5
The maximum number of expansion cards you can add to your computer will depend on the number and types of expansion slots available on your motherboard.
Expansion card - Wikipedia
A number of manufacturers have added one to three additional expansion slots (at the standard 0.8 inch spacing) to the standard 12-inch ATX motherboard width.
EXPANSION SLOT Definition & Meaning - Merriam-Webster
The meaning of EXPANSION SLOT is a socket on the motherboard of a computer into which an expansion card may be inserted.
ISA Slot Motherboard at ₹ 17500/piece | Computer Motherboard in ...
Only ISA plug-in cards are inserted into this expansion slot. This motherboard contains a shared PCI/ISA expansion slot. Only one of these slots may be used at one time by a plug-in card.