Communications: electrical – Digital comparator systems
Patent
1973-09-07
1976-09-07
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 920, G06F 916, G06F 1112
Patent
active
039797279
ABSTRACT:
In a control unit having a read only memory, a control program is provided which has provision for all features with which the machine may be equipped and for a selected number of future features. The control program contains one or more mainline control loops which interrogate mainline and feature functions sequentially to determine whether a function requires service. If a function is present and requires service, the appropriate routine is executed whereafter the mainline control program proceeds to execute the next indicated control program instruction. If a function is present, but does not require service, a normal return or other procedure is executed to return to the control loop. When a feature is addressed which is not present, a feature return is executed forcing the control program back to the instruction following the last branch.
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patent: 3579198 (1971-05-01), Giunta
patent: 3593297 (1971-07-01), Kadner
patent: 3599176 (1971-08-01), Cordero
patent: 3634833 (1972-01-01), Kreidermacher
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Catron Brittain Norman
Dumstorff Eugene Francis
Schloss Phillip Christian
Schroeder Larry Lloyd
International Business Machines - Corporation
Lahtinen Robert W.
Rhoads Jan E.
Shaw Gareth D.
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