Page "Computer multitasking" Paragraph 10

The first computer using a multiprogramming system was the British Leo III owned by J. Lyons and Co .. Several different programs in batch were loaded in the computer memory, and the first one began to run.

When the first program reached an instruction waiting for a peripheral, the context of this program was stored away, and the second program in memory was given a chance to run.

The process continued until all programs finished running.