<|im_start|>user
when was the first digital electronic calculating machine developed?<|im_end|>
<|im_start|>assistant
The first digital electronic calculating machines were developed during World War II. The first semiconductor transistors in the late 1940s were followed by the silicon-based MOSFET (MOS transistor) and monolithic integrated circuit chip technologies in the late 1950s, leading to the microprocessor and the microcomputer revolution in the 1970s.<|im_end|>
