Method and apparatus for executing an extended decor instruction

Details Method and apparatus for executing an extended decor instruction Method and apparatus for executing an extended decor instruction

1974-12-02

1978-02-28

Nusbaum, Mark E.

Boots, shoes, and leggings

G06F 918

Patent

active

040770583

ABSTRACT:
A multiprogrammable/multiprocessing digital computer system having a process control block for each process in the system, wherein each process control block includes information which specifies the state of a processor at any given time. Associated with each process control block is a decor extension table having information to indicate whether a specified function, such as the emulation of another processor, may be executed in the system. A native mode instruction indicating a specified function for either one instruction or for a plurality of instructions, is first checked to determine proper format, after which a determination is made by means of the decor extension table, as to whether or not the system is capable of executing the specified function indicated by the native mode instruction. If such native mode is not erroneous and if there is a positive indication of executability of the specified function by the system, then the particular specified function, such as the emulation mode of another processor, is activated.

REFERENCES:
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patent: 3593314 (1971-07-01), Moll
patent: 3614746 (1971-10-01), Klinkhamer
patent: 3665487 (1972-05-01), Campbell et al.
patent: 3723976 (1973-03-01), Alvarez et al.
patent: 3725864 (1973-04-01), Clark et al.
patent: 3757307 (1973-09-01), Cosserat et al.
patent: 3766532 (1973-10-01), Liebel
patent: 3812468 (1974-05-01), Wollum et al.

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