History+Of+Computers

30's calculated SLOW!!! 1936 Susa had first programing. same year guy at Harvard Iowa state John Atanasoff Bell Labs George Stibits PTO1 1938 1st electronic Comp.COnstructed in 1939 BTL1 Inventor: George Stibitz Builder: Bell Labs Operational: 1939 Retired: 1949 Cost: $20,000 Speed: 0.2 operations per second Z1 Memory 64 words Zuse Inventor: Konrad Zuse Builder: konrad Zuse Operational: 1941 Retired: 1944 (Destroyed) Cost: $6500 Speed: 0.5 operations per second Operations hardwired. Rebuilt in 1950 ABC Inventor: John V. Atanasoff Builders: Atanasoff and Berry Operational 1942 Cost: $7000 Size 6' x 3' x 3' Memory: 64 50 bit words Speed: 32 operations per second ASCC = Automated sequence controlled calculator Inventor: Howard Aiken builder IBM Operational: 1943 Retired: 1959 Cost $500,000 Size: 51' x 8' x 8' SSEC User: Wallace Eckert Builder: IBM Operational: 1948 Memory 160 digits Speed 50 multiplications