The IBM’s 700 Series
Photo Credit: Autopilot
This computer series by IBM was the first for the company which used the transistor technology. It was introduced in 1959 replacing the vacuum tube computers. It was also produced in large scale and a good number sold to the scientific research institutes and national laboratories. It is performing operations much faster than the IBM 650 series. The computer had a processor unit with varying number of bits, the highest being the 64-bit found in the supercomputer by then. The 700 series could be programmed using the FORTRAN assembly language and stores instructions to be executed next in its four registers. It was interfaced with the I/O devices such as tapes and disks. More key features can be found here .