jan 27, 1948 - IBM finished the SSEC (Selective Sequence Electronic Calculator). It was the first computer to modify a stored program. About 1300 vacuum tubes were used to construct the arithmetic unit and eight very high-speed registers, while 23000 relays were used in the control structure and 150 registers of slower memory.
Added to timeline:
Date:
jan 27, 1948
Now
~ 78 years ago