5 Notes

1. Charles Babbage and Augusta Ada King, the countless of Lovelace,imagined the construction of mechanical computers that would automatically and reliably perform these tasks. But it took about 125 years for engineers to turn this vision into reality.
2. In 1939 a young German named Konrad Zuse completed the ZI, the first programmable, general-purpose digital computer.
   
3. In 1993 Iowa stae university professor John Atanasoff and graduate student clifford Berry created the Atanasoff- Berry computer ABC, when he apptoached the international buisness machines, he was told IBM would never be interested in an eletronic machine.
4. The transitor was invented in 1948 as a substitute for the vaccume tube, and transistors first appeared in computers eight years later...
5. integrated circuits rapidly replaced transitorsfor the same reasons that trasitors superseded vacume tubes.

• Reliability
• size
• speed
• efficiency
• cost