JOHNNIAC

The JOHNNIAC was an early computer built by the RAND Corporation (not Remington Rand, maker of the contemporaneous UNIVAC I computer) and based on the von Neumann architecture that had been pioneered on the IAS machine.

[1] After being rescued from the scrap heap twice,[clarification needed] the machine is currently at the Computer History Museum in Mountain View, California.

There was only one test condition, whether or not the high bit of the A register was set.

In March 1955, 4096 words of magnetic-core memory were added to the system, replacing the earlier Selectrons.

Numerous changes were made to the input/output peripherals as well, and in 1964, a real-time clock was added to support time-sharing.