Method and apparatus for controlling the sequence of instruction

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G06F 900

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active

042120608

ABSTRACT:
A method and apparatus for controlling the instruction sequence in a stored program data processing system is described. An interrogation instruction causes the execution of a conditional check. As a result of this conditional check, one or the other of two bistable circuits is activated in dependence on the presence or absence of the prespecified condition. In an alternative embodiment, the apparatus can be modified to permit activation of both bistable circuits. One of the bistable circuits, when set, prevents execution of the next instruction in the instruction sequence. The setting of the other bistable circuit prevents execution of the next jump instruction occurring in the instruction sequence. A control signal in the interrogation instruction indicates which of the bistable circuits is to be set.

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patent: 3553655 (1971-01-01), Anderson et al.
patent: 3577189 (1971-05-01), Cocke et al.
patent: 3577190 (1971-05-01), Cocke et al.
patent: 3745533 (1973-07-01), Erwin et al.
patent: 3980991 (1976-09-01), Mercurio

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