Method and apparatus for controlling a microprocessor-based syst

Details Method and apparatus for controlling a microprocessor-based syst Method and apparatus for controlling a microprocessor-based syst

1979-08-06

1981-04-07

Wise, Edward J.

Boots, shoes, and leggings

364579, 364580, 364900, G06F 1520

Patent

active

042610419

ABSTRACT:
There is disclosed a microprocessor-based system whose firmware controls a normal mode of operation and a factory-adjustment mode of operation. The sequencing in the two modes is controlled by branching in accordance with system-state tests performed during the sequencing. The factory-adjustment mode of operation never takes place during normal use of the system, and a branch to the factory-adjustment mode is controlled by forcing particular system-state test signals in the factory. Where no extra test pins are available, a branch to the factory-adjustment mode can be controlled by forcing two incompatible test signals, that is, by forcing an overall system state which cannot occur during normal operation.

REFERENCES:
patent: 3764995 (1973-10-01), Helf, Jr. et al.
patent: 4043756 (1977-08-01), Sommervold
patent: 4155116 (1979-05-01), Tawfik et al.
patent: 4168527 (1979-09-01), Winkler

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