Excavating
Patent
1990-11-26
1993-08-10
Nguyen, Hoa T.
Excavating
371 61, 371 571, G06F 104, G06F 1120
Patent
active
052356035
ABSTRACT:
A system for determining the presence or absence of data on one or more data lines including a flip-flop for each data line with the output of each flip-flop connected to a NAND gate. The NAND gate is connected through an OR gate to two output flip-flops in series. The logic of the system is such that the output of the second of the two output flip-flops provides a signal level which is high or low depending on whether data is present on all of the data lines or one or more lines has no data.
REFERENCES:
patent: 3772649 (1973-11-01), Haselwood
patent: 3893617 (1975-07-01), Solberg
patent: 4020460 (1977-04-01), Jones et al.
patent: 4298982 (1981-11-01), Auerbach
patent: 4556947 (1985-12-01), Prioste et al.
patent: 4658399 (1987-04-01), D'Angio et al.
Crohn David C.
McNesby John B.
Codispoti Joseph S.
Indyk Eugene S.
Nguyen Hoa T.
Siemens Aktiengesellschaft
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