18-bit computing: Difference between revisions

Revision as of 23:06, 7 July 2015

Revision as of 20:36, 22 December 2015

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{{nofootnotesmore footnotes|date=October 2009}}

{{N-bit|18|(2.25 [[Octet (computing)|octets]])}}

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The [[DEC Radix-50]], called Radix 50₈ format, packs three characters plus two bits in each 18-bit word.<ref>Digital Equipment Corporation, ''PDP-9 Utility Programs--Advanced Software System--Programmer's Reference Manual'', [http://www.bitsavers.org/pdf/dec/pdp9/DEC-9A-GUAB-D_UTILITIES.pdf full text], Digital Equipment Corporation, 1968, Appendix 1.</ref>

The Teletype packs three characters in each 18-bit word; each character a 5-bit [[Baudot code]] and aan upper-case bit.<ref name="pdp7" />

The [[DEC SIXBIT]] format packs three characters in each 18-bit word,<ref name="pdp7">[http://bitsavers.trailing-edge.com/pdf/dec/pdp7/PDP-7_AsmMan.pdf "PDP-7 Symbolic Assembler Programming Manual"]. p. 6; p. 38-39.</ref> each 6-bit character obtained by stripping the high bits from the 7-bit ASCII code, which folds lowercase to uppercase letters.

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* [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.

[[Category:Computer data]]

{{CPU technologies}}

[[Category:Computer data]]