orthogonal instruction set

Computing Dictionary

orthogonal instruction set definition

architecture
An instruction set where all (or most) instructions have the same format and all registers and addressing modes can be used interchangeably - the choices of op code, register, and addressing mode are mutually independent (loosely speaking, the choices are "orthogonal"). This contrasts with some early Intel microprocessors where only certain registers could be used by certain instructions.
Examples include the PDP-11, 680x0, ARM, VAX.
(2002-06-26)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Orthogonal instruction set is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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