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18-bit: Wikis

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Processors
4-bit 8-bit 12-bit 16-bit 18-bit 24-bit 31-bit 32-bit 36-bit 48-bit 60-bit 64-bit 128-bit
Applications
16-bit 32-bit 64-bit
Data Sizes
nibble   octet   byte   word   dword   qword

In computer architecture, 18-bit integers, memory addresses, or other data units are those that are at most 18 bits (2.25 octets) wide. Also, 18-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.

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 262,144 (1000000 octal, 40000 hexadecimal) unique combinations.

The IBM 7700 Data Acquisition System was an 18-bit computer.

References

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