- Feb 1951
- Ferranti Ltd., of Manchester, England, completes the first
commercial computer, also called the "Mark I". 8 of them are sold.
- Mar 1951
- Eckert and Mauchly, having sold their company to Remington Rand,
complete the first UNIVAC, which is the first US commercial computer.
It has 1000 12-digit words of ultrasonic memory and can do 8333 additions
or 555 multiplications per second; it contains 5000 tubes and covers
200 square feet of floor.
- Grace Murray Hopper (1906-), of Remington Rand, invents the modern
concept of the compiler.
- The EDVAC is finally completed. It has 4000 tubes, 10000 crystal
diodes, and 1024 44-bit words of ultrasonic memory. Its clock speed
is 1 mHz.
- The IBM "Defense Calculator", later renamed the "701", the first
IBM computer unless you count the SSEC, enters production at
Poughkeepsie, New York. (The first one is delivered in March 1953; 19 are
sold altogether. The memory is electrostatic and has 4096 36-bit words;
it does 2200 multiplications per second.)
- Grace Murray Hopper implements the first compiler, the "A-0".
(As with "computer", this is a somewhat arbitrary designation.)