Method of checking the integrity of a source of additional memor

Details Method of checking the integrity of a source of additional memor Method of checking the integrity of a source of additional memor

1982-12-01

1984-12-11

Smith, Jerry

Excavating

364900, G06F 1110

Patent

active

044883005

ABSTRACT:
In an electronically controlled sewing machine which has the capability of accepting plug-in modules consisting of read only memories, a method is provided for checking the integrity of the module memory and the means for coupling the memory to the sewing machine controller. The controller reads the first two locations in the memory to check for the presence of alternating patterns of ones and zeros which indicate that shorted or open data lines are unlikely. Another location in the memory contains the number referred to as a checksum. The controller adds the contents of all the other locations of the module memory to this checksum. If the module is undamaged, this sum will be zero. If the sum is not zero, the controller recognizes that a faulty module has been inserted and advises the operator accordingly.

REFERENCES:
patent: 3735105 (1973-05-01), Maley
patent: 3745316 (1973-07-01), Olah
patent: 3838264 (1974-09-01), Maker
patent: 3906460 (1975-09-01), Halpern
patent: 4142243 (1979-02-01), Bishop
patent: 4355390 (1982-10-01), Hellwig et al.
patent: 4369511 (1983-01-01), Kimura et al.
patent: 4430735 (1984-02-01), Catiller

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