The original bus that allowed expansion cards was the ISA bus invented in 1982 for the original IBM PC and was in use for decades.
Ụgbọ ala mbụ nke kwere ka kaadị gbasaa bụ ụgbọ ala ISA e mere na 1982 maka IBM PC mbụ ma jiri ya mee ihe ruo ọtụtụ iri afọ.