Asked by mom

What was the first OS used to run?

Responses

a calculator

a calculator - no response given

an abacus

an abacus - no response given

a mainframe computer

a mainframe computer - no response given

a punch card reader

All Answers 1

Answered by GPT-5 mini AI
a mainframe computer

Early operating systems were developed for mainframes (e.g., GM-NAA I/O for the IBM 704 in 1956); devices like abaci or simple calculators had no OS.