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Burroughs Large Systems
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===B5000, B5500 and B5700=== {{Main|B5000 instruction set}} Programs on a B5000, B5500 and B5700 are made up of [[Syllable (computing)|12-bit syllables]], four to a word. The architecture has two modes, Word Mode and Character Mode, and each has a separate repertoire of syllables. A processor may be either Control State or Normal State, and certain syllables are only permissible in Control State. The architecture does not provide for addressing registers or storage directly; all references are through the 1024 word Program Reference Table, current code segment, marked locations within the stack or to the A and B registers holding the top two locations on the stack. Burroughs numbers bits in a syllable from 0 (high bit) to 11 (low bit)
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