US3838264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for, and method of, checking the contents of a computer store
Assignee: Individual
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Filing: 1973-02-20
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Granted: 1974-09-24
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Expires: 1993-02-20
Abstract
Abstract An apparatus for checking the contents of a store of a computer which is normally under control of a train of timing pulses, and in which the store is normally controlled by an address register in the computer, comprises a switching arrangement responsive to a command signal to remove the pulses from the remainder of the computer then automatically being returned to control of the pulses and the sum being retained for comparison with a known quantity.
Inventors
- 👤 P Maker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:00
CPC Classifications
G; G11; G11C; G11C29/00; G11C29/04; G11C29/08; G11C29/12; G11C29/38; G11C29/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
An apparatus for checking the contents of a digital data store, comprising a computer, means for supplying timing pulses to said computer, a bistable device responsive to a first input signal to provide a first output control signal and to a second input signal to provide a second output control signal, a counter, a first switching means responsive to the first output control signal to supply the timing pulses to an input of the counter, a second switching means responsive to the second output control signal to supply the timing pulses to the computer, a logic circuit which operates in the presence of the first output control signal to place the store under the control of an output from the counter and in the presence of the second output control signal to place the store under the control of the computer, means operable when the count state of the counter has reached a predetermined value, for providing the second input signal, adding means controlled by the said timing pulses for providing a sum of the contents of locations within the said store when the latter is controlled by the counter output and means for supplying the said sum to the computer for comparison with a required value.
Claim 2
Independent Claim
207 words
An apparatus for checking the contents of a digital data store, comprising a computer, means for supplying timing pulses to said computer, a bistable device responsive to a first input signal to provide a first output control signal and to a second input signal to provide a second output control signal, a counter, a first switching means responsive to the first output control signal to supply the timing pulses to an input of the counter, a second switching means responsive to the second output control signal to supply the timing pulses to the computer, a logic circuit which operates in the presence of the first output control signal to place the store under the control of an output from the counter and in the presence of the second output control signal to place the store under the control of the computer, means operable when the count state of the counter has reached a predetermined value, for providing the second input signal, adding means controlled by the said timing pulses for providing a sum of the contents of locations within the said store when the latter is controlled by the counter output and means for supplying the said sum to the computer for comparison with a required value.
Claim 3
Dependent Claim
28 words
An apparatus as claimed in claim 1 which includes means, operable in the absence of said first output control signal, to reset the counter to an initial condition.
Claim 4
Dependent Claim
33 words
An apparatus as claimed in claim 1 in which the first switching means comprises an AND gate adapted to receive as its inputs the said timing pulses and said first output control signal.
Claim 5
Dependent Claim
33 words
An apparatus as claimed in claim 1 in which the second switching means comprises an AND gate adapted to receive as its inputs the said timing pulses and said second output control signal.
Claim 6
Dependent Claim
45 words
An apparatus as claimed in claim 1 in which the said logic circuit comprises pairs of AND gates and an OR gaTe associated with each pair of AND gates, the inputs of said OR gates being provided by the outputs of the associated AND gates.
Claim 7
Dependent Claim
63 words
An apparatus as claimed in claim 5 in which one AND gate of each said pair is adapted to receive as inputs the first output control signal and said counter output and the other AND gate of each pair is adapted to receive as inputs the second output control signal and a signal from an address register which forms part of the computer.
Claim 8
Dependent Claim
29 words
An apparatus as claimed in claim 1 in which the means for providing the second input signal comprises a comparator circuit having as an input the said counter output.
Claim 9
Dependent Claim
39 words
An apparatus as claimed in claim 1 in which said means for providing a sum comprises an adder to which signals from locations in the said store are sequentially supplied when the latter is controlled by the counter output.
Claim 10
Dependent Claim
70 words
An apparatus as claimed in claim 8 in which said summing means further comprises an answer circuit operable in the presence of timing pulses supplied from said first switching means to supply output signals from said adder to an input thereof, whereby an output from said answer circuit corresponds, in use, to the sum of the contents of those of the store locations which have been supplied to the adder.
Claim 11
Dependent Claim
45 words
An apparatus as claimed in claim 9 in which the means for supplying the sum to the computer comprises a gate having as one of tis inputs the output from the answer circuit and as another of its inputs an output from the logic circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |