Display terminal

Details Display terminal Display terminal

1984-03-06

1987-01-13

Caldwell, Sr., John W.

Communications: electrical

Systems

Timer control

3403095, G08S 100

Patent

active

046367705

ABSTRACT:
In a display terminal coupled to a computer and including a plurality of user interrupt devices for interactive communication with the computer, an apparatus for signalling to the user when the computer responds to a user interrupt comprises a counter arranged to measure a specified period of time by counting down to zero from an initial count value loaded from a register, a sensor triggered by the generation of an interrupt to cause the counter to begin measurement of the said specified period of time, and a further sensr coupled to an alarm via a logic gate to provide an audible signal only when the period of time between the generation of the interrupt and the computer response exceeds the specified period of time measured by the counter.

REFERENCES:
patent: 3778809 (1973-12-01), Hawes
patent: 3820105 (1974-06-01), Assmus
patent: 3916090 (1975-10-01), Taibl
patent: 4062007 (1977-12-01), Scott
patent: 4161787 (1979-07-01), Groves et al.
patent: 4364655 (1982-12-01), Parker
patent: 4400699 (1983-08-01), Glasmacher
patent: 4463416 (1984-07-01), Wood
Electronic Design, vol. 25, No. 6, 15th Mar. 1977, pp. 10, 15, C. R. Allen: "If I Don't Simplify It, the Picture Will", whole article.

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