History+Of+Computers

1936 Susa had first programing. same year guy at Harvar. lowa state john Adanashoff Bell Labs George stibits built PT01. 1938 1st electronic computer constructed in 1938 BTL1/ inventor:George stibits, Builder: Bell labs, Operational: 1939, Retired:1949, cost:$20,000 Speed: 0.2 operations per second Z1 memory of 64 words. 1941 Z3 inventor: konrad Zuse, builder: Konad zuse, Operational: 1941, Retired: 1944 (destroyed), cost: $6500. speed: 0.5 operations per Operations hardwired. Rebuilt in 1950 ABC/ i=Inventor: John V. Atanasoff, Builder: Atanasoff and berry, Operational: 1942, Cost:$7000, Size 6 x 3 x 3, Technology: Tubes, Capacitors, Cards, Memory: 64 50-bit words, Program: Fixed, Matrix arithmetic calculator, Speed: 32 operations per secound 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: Walace Eckert, Builder: IBM, Operational: 1948, Size 25 x 50 floor plan, Technology: Tubes, cards, relay, Memory: 160 didgits in vacuum tubes. 300 in relays. 400,000 on punched tape, speed: 50 multiplications per second
 * 1) 30's calculated slow.