| Year | Month | Japan | Month | World |
| 1643 |
|
|
| B.Pascal (France) invented adding machine (prototype) |
| 1694 |
|
|
| G.W.Leibniz(Germany)invented adding&multipling machine (prototype) |
| 1833 |
|
|
| C.Babbage (Britain) showed the concept of computing as Analytical Engine |
| 1887 |
|
|
| H.Hollerith completed punched card equipment (PCS):Punch Card System |
| 1902 |
|
Yazu Ryoichi developed a Mechanical Calculating Machine (Automatic Abacus) |
| |
| 1923 |
|
Ohmoto Torajiro developed Tiger Calculating machines |
| |
| 1936 |
|
Nakajima Akira & Hanzawa Masao(NEC) published a paper on the switching theory |
| A.M.Turing completed the theoretical model of a computer (Turing Machine) |
| 1938 |
|
|
| C.Shannon published the switching theory |
| 1940 |
|
|
| Bell Labs. completed Bell Labs Model I (telephone relays) |
| 1942 |
|
Ohhashi Kanichi (ETL:Electrotechnical Lab.) published a paper on the circuit theory for relay circuits |
| |
| 1944 |
|
|
| Harvard Univ.& IBM completed Mark I |
| 1945 |
|
|
| J.von.Neumann offered the logical design of electronic digital computer as a first draft of a report on the EDVAC |
| 1946 |
|
|
02 | J.W.Mauchly & J.P.Eckert completed the first digital computer, ENIAC |
| 1947 |
|
Yamashita Hideo et al. built Statistical Machine of Yamashita Type |
| |
| 1948 |
|
|
| Bell Labs invented transistor |
| 1948 |
|
|
| University of Manchester completed "baby machine" (static memory) |
| 1949 |
|
Goto Mochinori (ETL) published a paper on expanded Boolean algebra "Logic Mathematics" |
05 | M.V.Wilkes completed the first stored-program computer, EDSAC |
| 1950 |
|
Joh Kenzo (Osaka Univ.) did the trial production of the ENIAC type's arithmetic system with vacuum tubes |
| National Bureau of Standards completed SEAC |
| 1950 |
|
|
| Remington Rand completed the first commercial computer, UNIVAC I |
| 1951 |
|
|
10 | Univ. of Pennsylvania completed EDVAC |
| 1951 |
|
|
| M.V.Wilkes offered micro-program method |
| 1951 |
|
|
| ERA, Inc announced ERA1101 |
| 1952 |
|
ETL developed a prototype of a relay computer, the ETL Mark I |
09 | Univ. of Illinois completed ILLIAC I |
| 1952 |
|
|
12 | IBM installed its first IBM commercial computer, IBM701at its head office |
| 1953 |
|
Joh Kenzo & Makinouchi Saburo published the first Japanese technical book on the electronic computer, " Digital and Analog Computers " |
07 | IBM announced IBM650 |
| 1953 |
|
|
| MITcompleted Whirlwind magnetic core memory |
| 1953 |
|
|
| IBM announced business computer, IBM702 |
