Stored-program computer

Many early computers, such as the Atanasoff–Berry Computer, were not reprogrammable. They executed a single hardwired program. As there were no program instructions, no program storage was necessary. Other computers, though programmable, stored their programs on punched tape which was physically fed into the machine as needed.
The University of Manchester's Small-Scale Experimental Machine (SSEM) was the world's first stored-program computer. The Manchester Mark 1 was another early stored-program computer.


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