18-bit

18-bit

Possibly the most well-known 18-bit computer architectures are the PDP-1, PDP-4, PDP-7, PDP-9 and PDP-15 minicomputers produced by Digital Equipment Corporation from 1960 to 1975. UNIVAC also produced a number of 18-bit computers, including the UNIVAC 418 and several military systems.

18 binary digits have 262144 (1000000 octal, 40000 hexadecimal) unique combinations.

References

* [http://research.microsoft.com/Users/gbell/Digital/timeline/18-bit.htm DIGITAL Computing Timelime: 18-bit architecture]
* [http://simh.trailing-edge.com/docs/architecture18b.pdf "Architectural Evolution in DEC’s 18b Computers"] , Bob Supnik, 2006.


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