The Maniac III (Mathematical Analyzer Numerical Integrator and Automatic Computer Model III) was a second-generation electronic computer (i.e., using solid state electronics rather than vacuum tubes), built in 1961 for use at the Institute for Computer Research at the University of Chicago.

It was designed by Nicholas Metropolis and constructed by the staff of the Institute for Computer Research. Its design was changed to eliminate vacuum tubes, and thus it occupied a very small part of a very large and powerfully air-conditioned room. It used 20,000 diodes and 12,000 transistors, and had 16K 48-bit words of core memory. Its floating multiply time was 71 microseconds, and divide was 81 microseconds.

Its most novel feature was unnormalized significance arithmetic floating point. This allowed users to determine the change in precision of results due to the nature of the computation.


* [ 1964 BRL report]

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