What is the history of expansion slots in computers?

What is the history of expansion slots in computers? expansion slot drawing 2 x 120140 mm fans with slot GPU in 4 slots GPU mode Compatibility Motherboard compatibility Mini-ITX; Mini-DTX, MATX, ATX expansion slot drawing The document discusses expansion slots in computers It lists the group members and then covers standards for expansion slots including PCI,

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expansion slot ISAEISA slot diagram for the PC Server 325  Card capacity and size Mac Pro has seven PCIe slots that accept many different types of PCIe cards: Slot 1: gen 4, up to x16